Hydrogen damage assessment method, device and equipment for circumferential weld of high-steel-grade pipeline and medium

Abstract

The embodiment of the invention provides a hydrogen damage assessment method, device and equipment for a circumferential weld of a high-steel-grade pipeline and a medium. The method comprises the following steps: firstly, determining hydrogen concentration data and stress data when hydrogen diffuses in a to-be-treated high-steel-grade pipeline circumferential weld, then determining a coupling relationship between hydrogen diffusion and stress according to the hydrogen concentration data, the stress data and a preset damage coupling model, and finally, determining the stress of the to-be-treated high-steel-grade pipeline circumferential weld on the basis of the coupling relationship. And evaluating the hydrogen damage of the circumferential weld of the high-steel-grade pipeline to be treated by adopting a finite element method, and determining damage information. According to the method, safety evaluation of the pipeline circumferential weld in the absence of hydrogen environment in the prior art is considered, the damage coupling model corresponding to the fracture damage constitutive of the high-steel-grade pipeline circumferential weld in the hydrogen environment considering coupling of the hydrogen medium and the complex stress state is established, and hydrogen diffusion and stress of the circumferential weld can be analyzed; and in combination with a finite element user dynamic subprogram, programming of the hydrogen damage constitutive is realized, and support is provided for accurately evaluating hydrogen damage information of the circumferential weld.

Description

Technical Field

[0001] This application relates to the field of oil and gas pipeline transportation technology, and in particular to a method, apparatus, equipment and medium for assessing hydrogen damage in circumferential welds of high-strength steel pipelines. Background Technology

[0002] As a critical connection point in hydrogen-blended natural gas pipelines, the circumferential weld of high-strength steel pipelines has a complex metallographic structure and contains microscopic defects such as cracks, incomplete penetration, and misalignment. In a hydrogen-blended environment, hydrogen atoms enter the circumferential weld material and couple with the stress field, easily causing cracking of the weld and threatening pipeline safety. Therefore, it is necessary to conduct fracture behavior simulation assessment of the circumferential weld of hydrogen-blended natural gas pipelines.

[0003] Existing methods mainly simulate hydrogen-induced fracture behavior through multi-scale modeling. For example, the cohesive model simulates the crack propagation process by defining the damage evolution law at the crack tip; the phase field model simulates the nucleation and propagation of hydrogen-induced cracks by constructing multi-field coupling equations that include displacement field, phase field and hydrogen concentration field; and the void damage (Gurson-Tvergaard-Needleman, GTN) model describes the ductile fracture process of materials by introducing the void volume fraction.

[0004] However, existing methods suffer from insufficient accuracy in assessing damage caused by hydrogen-induced fracture. Summary of the Invention

[0005] This application provides a method, apparatus, equipment, and medium for assessing hydrogen damage in circumferential welds of high-strength steel pipelines, in order to improve the accuracy of hydrogen damage assessment in circumferential welds of pipelines.

[0006] In a first aspect, embodiments of this application provide a method for assessing hydrogen damage in the circumferential weld of a high-strength steel pipeline, comprising:

[0007] Determine the hydrogen concentration and stress data during hydrogen diffusion in the circumferential weld of the high-grade steel pipe to be treated;

[0008] Based on the hydrogen concentration data, the stress data, and the preset damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined;

[0009] Based on the aforementioned coupling relationship, the hydrogen damage of the circumferential weld of the high-grade steel pipeline to be treated is evaluated using the finite element method to determine the damage information.

[0010] In one or more embodiments, determining the coupling relationship between hydrogen diffusion and stress based on the hydrogen concentration data, the stress data, and a preset damage coupling model includes:

[0011] Based on the hydrogen concentration data and the preset hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined. The preset hydrogen diffusion equation is derived based on the law of conservation of mass and by introducing a preset stress parameter term.

[0012] Based on the stress data and the preset hydrogen damage equation, a second correlation between hydrogen concentration and stress damage is determined. The preset hydrogen damage equation is derived from the material damage theory based on the introduction of hydrogen gas.

[0013] Based on the first correlation, the second correlation, and the preset damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined.

[0014] In one or more embodiments, before determining the first correlation between hydrogen concentration and stress based on the hydrogen concentration data and a preset hydrogen diffusion equation, the method further includes:

[0015] Obtain the lattice hydrogen concentration and captured hydrogen concentration of the circumferential weld of the high-grade steel pipe to be treated;

[0016] The hydrogen concentration data is determined based on the lattice hydrogen concentration and the captured hydrogen concentration.

[0017] In one or more embodiments, determining the first correlation between hydrogen concentration and stress based on the hydrogen concentration data and a preset hydrogen diffusion equation includes:

[0018] Obtain the trap binding energy of the circumferential weld of the high-grade steel pipe to be treated;

[0019] Based on the trap binding energy, a third correlation is determined between the lattice hydrogen concentration and the trapped hydrogen concentration;

[0020] Based on the hydrogen concentration data, the third correlation, and the preset hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined.

[0021] In one or more embodiments, determining the second correlation between hydrogen concentration and stress damage based on the stress data and a preset hydrogen damage equation includes:

[0022] Obtain the stress data of the circumferential weld of the high-grade steel pipe to be processed, the stress data including equivalent plastic strain data and three-dimensional stress components;

[0023] Based on the three-dimensional stress components, the hydrostatic stress data are determined;

[0024] Substitute the lattice hydrogen concentration, the trapped hydrogen concentration, the equivalent plastic strain, and the hydrostatic stress data into a preset hydrogen damage equation to determine the stress damage data.

[0025] Based on the stress damage data and the hydrogen concentration data, a second correlation between hydrogen concentration and stress damage is determined.

[0026] In one or more embodiments, the method further includes:

[0027] Based on the finite element user dynamic subroutine, the hydrostatic stress data, the lattice hydrogen concentration, and the captured hydrogen concentration are obtained;

[0028] The hydrostatic stress data, the lattice hydrogen concentration, and the captured hydrogen concentration are substituted into the preset hydrogen diffusion equation and the preset hydrogen damage equation, respectively, to update the first correlation and the second correlation.

[0029] Secondly, embodiments of this application provide a hydrogen damage assessment device for circumferential welds of high-strength steel pipelines, comprising:

[0030] The determination module is used to determine the hydrogen concentration data and stress data when hydrogen diffuses in the circumferential weld of the high-grade steel pipe to be treated;

[0031] The processing module is used to determine the coupling relationship between hydrogen diffusion and stress based on the hydrogen concentration data, the stress data, and a preset damage coupling model.

[0032] The evaluation module is used to evaluate the hydrogen damage of the circumferential weld of the high-grade steel pipe to be treated based on the coupling relationship and using the finite element method to determine the damage information.

[0033] In one or more embodiments, the processing module is specifically used for:

[0034] Based on the hydrogen concentration data and the preset hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined. The preset hydrogen diffusion equation is derived based on the law of conservation of mass and by introducing a preset stress parameter term.

[0035] Based on the stress data and the preset hydrogen damage equation, a second correlation between hydrogen concentration and stress damage is determined. The preset hydrogen damage equation is derived from the material damage theory based on the introduction of hydrogen gas.

[0036] Based on the first correlation, the second correlation, and the preset damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined.

[0037] In one or more embodiments, before determining the first correlation between hydrogen concentration and stress based on the hydrogen concentration data and a preset hydrogen diffusion equation, the processing module is further configured to:

[0038] Obtain the lattice hydrogen concentration and captured hydrogen concentration of the circumferential weld of the high-grade steel pipe to be treated;

[0039] The hydrogen concentration data is determined based on the lattice hydrogen concentration and the captured hydrogen concentration.

[0040] In one or more embodiments, the processing module determines a first correlation between hydrogen concentration and stress based on the hydrogen concentration data and a preset hydrogen diffusion equation, specifically for:

[0041] Obtain the trap binding energy of the circumferential weld of the high-grade steel pipe to be treated;

[0042] Based on the trap binding energy, a third correlation is determined between the lattice hydrogen concentration and the trapped hydrogen concentration;

[0043] Based on the hydrogen concentration data, the third correlation, and the preset hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined.

[0044] In one or more embodiments, the processing module determines a second correlation between hydrogen concentration and stress damage based on the stress data and a preset hydrogen damage equation, specifically for:

[0045] Obtain the stress data of the circumferential weld of the high-grade steel pipe to be processed, the stress data including equivalent plastic strain data and three-dimensional stress components;

[0046] Based on the three-dimensional stress components, the hydrostatic stress data are determined;

[0047] Substitute the lattice hydrogen concentration, the trapped hydrogen concentration, the equivalent plastic strain, and the hydrostatic stress data into a preset hydrogen damage equation to determine the stress damage data.

[0048] Based on the stress damage data and the hydrogen concentration data, a second correlation between hydrogen concentration and stress damage is determined.

[0049] In one or more embodiments, the processing module is further configured to:

[0050] Based on the finite element user dynamic subroutine, the hydrostatic stress data, the lattice hydrogen concentration, and the captured hydrogen concentration are obtained;

[0051] The hydrostatic stress data, the lattice hydrogen concentration, and the captured hydrogen concentration are substituted into the preset hydrogen diffusion equation and the preset hydrogen damage equation, respectively, to update the first correlation and the second correlation.

[0052] Thirdly, embodiments of this application provide an electronic device, including: a memory and a processor;

[0053] The memory stores computer-executed instructions;

[0054] The processor executes computer execution instructions stored in the memory, such that the processor, when executed, is used to implement the method described in the first aspect and any of the embodiments above.

[0055] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods described in the first aspect and any of the embodiments above.

[0056] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, is used to implement a method for assessing hydrogen damage in circumferential welds of high-strength pipes as described in the first aspect and various possible implementations of the first aspect.

[0057] This application provides a method, apparatus, equipment, and medium for assessing hydrogen damage in circumferential welds of high-strength steel pipelines. The method first determines the hydrogen concentration and stress data during hydrogen diffusion in the circumferential weld of the high-strength steel pipeline to be treated. Then, based on the hydrogen concentration data, stress data, and a pre-defined damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined. Finally, based on this coupling relationship, the finite element method is used to assess the hydrogen damage in the circumferential weld of the high-strength steel pipeline to be treated, and damage information is determined. In this method, determining the hydrogen concentration and stress data provides accurate basic data for subsequent analysis; establishing the coupling relationship between hydrogen concentration and stress helps reveal the mechanism by which hydrogen affects material properties; based on the pre-defined damage coupling model, it is possible to deeply analyze how hydrogen diffusion is affected by stress state and how stress affects hydrogen diffusion behavior; combined with a finite element user dynamic subroutine, the constitutive model of hydrogen damage is programmed, thereby enabling efficient and accurate numerical simulation for assessing hydrogen damage in the circumferential weld of the high-strength steel pipeline to be treated, and comprehensively evaluating the diffusion of hydrogen in the circumferential weld of the high-strength steel pipeline and the resulting damage. Attached Figure Description

[0058] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0059] Figure 1 A flowchart illustrating the hydrogen damage assessment method for high-strength steel pipe circumferential welds provided in this application embodiment. Figure 1 ;

[0060] Figure 2 A flowchart illustrating the hydrogen damage assessment method for high-strength steel pipe circumferential welds provided in this application embodiment. Figure 2 ;

[0061] Figure 3 A schematic diagram illustrating the relationship between lattice hydrogen concentration, trap binding energy, and trapping site occupancy rate provided for embodiments of this application;

[0062] Figure 4 A schematic diagram of the structure of the hydrogen damage assessment device for high-strength steel pipe circumferential welds provided in the embodiments of this application;

[0063] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0064] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0065] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0066] Before introducing the embodiments of this application, the application background of the embodiments of this application will be explained first:

[0067] With the rapid development of the global hydrogen energy industry, the large-scale application of high-pressure hydrogen transportation pipelines and hydrogen storage containers has placed higher demands on the hydrogen embrittlement resistance of materials. Incorporating hydrogen into existing natural gas pipelines is an economically feasible solution for large-scale, long-distance hydrogen transportation. However, the penetration of hydrogen molecules into pipeline materials may cause hydrogen-induced damage, such as hydrogen bubbling and hydrogen-induced cracking, which seriously threatens the long-term stability and safety of transportation pipelines.

[0068] High-strength steel pipelines, due to their high strength and corrosion resistance, have become the mainstream material for long-distance natural gas pipelines in my country. However, the circumferential welds of high-strength steel pipelines, as critical connection points, have complex metallographic structures and are susceptible to microscopic defects such as cracks, incomplete penetration, and misalignment. In hydrogen-doped environments, hydrogen atoms readily enter the circumferential weld material of high-strength steel pipelines through mechanisms such as lattice diffusion and dislocation trapping. Coupled with the stress field, this significantly accelerates crack initiation and propagation, threatening pipeline safety. Therefore, it is necessary to conduct fracture behavior simulation assessments of circumferential welds in hydrogen-doped natural gas pipelines.

[0069] Existing methods mainly simulate hydrogen-induced fracture behavior through multi-scale modeling. For example, the cohesive model simulates the crack propagation process by defining the damage evolution law at the crack tip; the phase field model simulates the nucleation and propagation of hydrogen-induced cracks by constructing multi-field coupling equations that include displacement field, phase field and hydrogen concentration field; and the void damage (Gurson-Tvergaard-Needleman, GTN) model describes the ductile fracture process of materials by introducing the void volume fraction.

[0070] However, existing methods suffer from insufficient accuracy in assessing damage caused by hydrogen-induced fracture.

[0071] This application provides a method for assessing hydrogen damage in circumferential welds of high-strength steel pipelines, aiming to address the aforementioned technical problems in existing technologies. The technical concept of this application is as follows: Existing methods simulate hydrogen-induced fracture behavior through multi-scale modeling, but suffer from insufficient accuracy in assessing hydrogen-induced fracture damage. To determine hydrogen-induced damage in circumferential welds of high-strength steel pipelines, this application considers combining hydrogen concentration and stress fields to dynamically correlate the damage evolution process, achieving multi-scale, high-precision simulation of the fracture behavior of circumferential welds in high-strength steel pipelines under hydrogen conditions. Therefore, this application first determines the hydrogen concentration and stress data during hydrogen diffusion in the circumferential weld of the high-strength steel pipeline to be treated. Then, based on the hydrogen concentration data, stress data, and a pre-set damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined. A coupling mechanism is introduced between the hydrogen diffusion control equation (considering the dynamic balance between lattice hydrogen and trapped hydrogen) and the damage constitutive model (improved GTN model) to achieve joint simulation of the effects of hydrogen concentration gradient, hydrostatic stress field, and plastic strain on crack initiation and propagation. Finally, based on the coupling relationship, the finite element method is used to evaluate the hydrogen damage of the circumferential weld of the high-strength steel pipeline to be treated and determine the damage information.

[0072] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0073] Figure 1 A flowchart illustrating the hydrogen damage assessment method for high-strength steel pipe circumferential welds provided in this application embodiment. Figure 1 .like Figure 1 As shown, the hydrogen damage assessment method for the circumferential weld of this high-strength steel pipeline includes the following steps:

[0074] S110. Determine the hydrogen concentration and stress data when hydrogen diffuses in the circumferential weld of the high-grade steel pipe to be treated.

[0075] In this step, we obtain the hydrogen distribution characteristics (i.e., hydrogen concentration data) and basic stress state data (i.e., stress data) of the circumferential weld of high-strength steel pipe in a hydrogen environment, providing input for subsequent coupled analysis.

[0076] For example, hydrogen concentration data is divided into lattice hydrogen concentration and trapped hydrogen concentration, and stress data includes three-dimensional stress (axial, circumferential, and radial) and plastic strain covering the circumferential weld of high-strength pipes.

[0077] In one possible implementation, the stress-strain field affects hydrogen transport through two phenomena: first, hydrostatic stress causes lattice expansion, and hydrogen tends to diffuse towards the expansion sites; second, plastic strain increases the number of lattice defects, thereby creating trapping sites. That is, for metallic materials, hydrogen exists in both lattice sites and trapping sites.

[0078] The lattice hydrogen occupancy of the circumferential weld of the high-grade steel pipeline to be treated was obtained through hydrogen permeation tests. The lattice potential density was calculated by combining this with the matrix metal density and molar mass. Metallographic analysis was used to statistically determine carbide and grain sizes, and the hydrogen concentration trapped by the three types of traps was calculated using a dislocation trap density formula related to plastic strain. This data was then summarized into total hydrogen concentration data. Furthermore, a simplified model of the circumferential weld of the high-grade steel pipeline was established using finite element method (FEM) software. Under conditions such as internal pressure and axial load, the three-dimensional stress components and equivalent plastic strain were obtained as stress data.

[0079] S120. Based on hydrogen concentration data, stress data, and a pre-defined damage coupling model, determine the coupling relationship between hydrogen diffusion and stress.

[0080] In this step, hydrogen diffusion behavior is associated with stress based on a damage coupling model, clarifying the two-way influence mechanism between the two. Hydrogen diffusion is driven by stress gradient, and the stress field is reconstructed due to hydrogen-induced damage. The correlation logic between hydrogen diffusion and damage evolution is integrated to form a closed-loop coupling relationship.

[0081] In one possible implementation, a pre-defined damage coupling model can be used to describe the void nucleation, growth, and coalescence process of the circumferential weld of the high-grade steel pipe under the coupled action of hydrogen concentration field and stress field. The void nucleation, growth, and coalescence process is dynamically correlated with hydrogen concentration gradient, hydrostatic stress field, and plastic strain, ultimately achieving joint simulation of hydrogen concentration field, stress field, and damage evolution, and determining the coupling relationship between hydrogen diffusion and stress.

[0082] S130. Based on the coupling relationship, the finite element method is used to evaluate the hydrogen damage of the circumferential weld of the high-grade steel pipeline and determine the damage information.

[0083] In this step, based on the established coupling relationship, the hydrogen damage of the circumferential weld of high-grade steel pipeline is quantitatively evaluated by numerical simulation using the finite element method, and key parameters of damage evolution are output to obtain damage information.

[0084] In one possible implementation, the damage coupling model is embedded into the finite element software through a subroutine of the finite element method. The boundary conditions corresponding to the hydrogen concentration data and stress data are input, the iterative calculation step size is set, and numerical simulation is performed.

[0085] During the simulation, the hydrogen concentration field distribution, void volume fraction, and damage variables are updated in real time. When the damage variables reach a critical value or the void volume fraction meets the coalescence condition, hydrogen-induced failure is determined to have occurred. Furthermore, damage information such as damage initiation location, crack propagation rate, and fracture toughness is output to complete the hydrogen damage assessment of the circumferential weld of high-strength steel pipelines.

[0086] The hydrogen damage assessment method for high-strength steel pipeline circumferential welds of this application first determines the hydrogen concentration and stress data during hydrogen diffusion in the circumferential weld of the high-strength steel pipeline to be treated. Then, based on the hydrogen concentration data, stress data, and a preset damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined. Finally, based on the coupling relationship, the finite element method is used to assess the hydrogen damage of the circumferential weld of the high-strength steel pipeline to be treated and determine the damage information. In this embodiment, determining the hydrogen concentration and stress data provides accurate basic data for subsequent analysis; establishing the coupling relationship between hydrogen concentration and stress helps reveal the mechanism by which hydrogen affects material properties; based on the preset damage coupling model, it is possible to deeply analyze how hydrogen diffusion is affected by stress state and how stress affects hydrogen diffusion behavior; using the finite element method to assess hydrogen damage in the circumferential weld of the high-strength steel pipeline to be treated enables efficient and accurate numerical simulation, comprehensively evaluating the diffusion of hydrogen in the circumferential weld of the high-strength steel pipeline and the resulting damage.

[0087] Based on the above embodiments, Figure 2 A flowchart illustrating the hydrogen damage assessment method for high-strength steel pipe circumferential welds provided in this application embodiment. Figure 2 .like Figure 2 As shown, one possible implementation of step S120 above includes the following steps:

[0088] S210. Based on the hydrogen concentration data and the preset hydrogen diffusion equation, determine the first correlation between hydrogen concentration and stress;

[0089] The preset hydrogen diffusion equation is derived based on the law of conservation of mass and by introducing a preset stress parameter term.

[0090] In this step, the hydrogen concentration data is substituted into the preset hydrogen diffusion equation derived based on the law of conservation of mass and by introducing preset stress parameter terms to determine the first correlation between hydrogen concentration and stress.

[0091] In one possible implementation, the correlation between lattice hydrogen concentration and captured hydrogen concentration is established based on the Oriani equilibrium theory, hydrogen concentration data is determined, and the hydrostatic stress gradient in the stress data is introduced into the hydrogen diffusion equation to obtain a preset hydrogen diffusion equation, thereby determining the first correlation between hydrogen concentration and stress.

[0092] In one possible implementation, prior to step S210 above, the hydrogen damage assessment method for the circumferential weld of the high-strength steel pipe further includes the following steps:

[0093] Step 1: Obtain the lattice hydrogen concentration and captured hydrogen concentration of the circumferential weld of the high-grade steel pipe to be treated;

[0094] For example, the concentration of freely diffusing lattice hydrogen and the concentration of trapped hydrogen captured by microscopic defects in the circumferential weld of a high-grade steel pipe are obtained separately. The two together constitute the complete existence form of hydrogen in the circumferential weld and are the basis for subsequent hydrogen concentration data calculation.

[0095] In one possible implementation, there are two methods for calculating the lattice hydrogen concentration:

[0096] Method 1: Define parameters This refers to the number of solvent lattice atoms per unit lattice volume, i.e., the density of solvent atoms.

[0097] when When defined as the density of solvent atoms, the lattice hydrogen concentration depends on the interstitial type and the host metal lattice. The calculation formula is as follows:

[0098]

[0099] in, This indicates the number of hydrogen atoms that can reside in each lattice site. Indicates the lattice occupancy (0 < <1).

[0100] On the one hand, That is, the number of metal atoms per unit volume. That is, the number of hydrogen atoms in each metal atom. That is, the actual number of hydrogen sites occupied by hydrogen atoms ( <<1, usually what is actually being dealt with is a diluted substance). Therefore, and These are all material properties (related to metal solvents), and This depends on the environment and the diffusion of hydrogen. It can be calculated using the following formula:

[0101]

[0102] in, Let represent Avogadro's constant, taken as 6.022 × 10⁻⁶. 23 , The molar volume of the principal lattice is equal to the molar mass divided by the density. ).

[0103] The second method is to define parameters. The number of lattice points per unit volume, i.e., lattice potential density;

[0104] when When defined as lattice potential density, the lattice hydrogen concentration depends on the interstitial type and the host metal lattice. The calculation formula is as follows:

[0105]

[0106] It can be calculated using the following formula:

[0107]

[0108] In summary, based on two different parameters The definition method yields the same lattice hydrogen concentration; therefore, the parameters... The definition does not affect the calculation results of lattice hydrogen concentration.

[0109] In addition, pipeline steel materials are usually equipped with The value is 6, which is due to the α-iron lattice, where tetrahedral sites are occupied at room temperature, rather than octahedral sites.

[0110] In one possible implementation, similar to the method for calculating lattice hydrogen concentration, the case of multiple traps in metallic materials is considered, and the... The formula for calculating the hydrogen concentration in the trap is shown below:

[0111]

[0112] in, This represents the trap density per unit volume. This indicates the number of atomic sites per trap, which will be set in subsequent processing. , Indicates trap occupancy rate (0 < <1), This indicates the number of capture sites per unit volume.

[0113] have Total hydrogen concentration captured by the system of this type of hydrogen trap for:

[0114]

[0115] Trap density Depending on the specific trapping sites considered, three types of hydrogen traps are typically considered in the study of hydrogen embrittlement in pipeline steel: dislocations, carbides, and martensitic grain boundaries. Among them, the trap density at dislocation sites increases with increasing plastic strain, while the trap density at carbide sites and grain boundary sites remains constant.

[0116] Dislocation location trap density With plastic strain The relationship can be represented as follows:

[0117]

[0118] The formula for calculating carbide trap density is as follows:

[0119]

[0120] in, Indicates the diameter of the carbide. Indicates the load frequency. Indicates the crack length. This represents the average distance between carbide particles.

[0121] The formula for calculating the martensite grain boundary trap density is as follows:

[0122]

[0123] in, Represents the Burgers vector. This indicates the average grain size.

[0124] Step 2: Determine the hydrogen concentration data based on the lattice hydrogen concentration and the captured hydrogen concentration.

[0125] For example, based on the physical characteristics and coupling relationship of the two types of hydrogen concentrations, hydrogen concentration data that reflects the hydrogen distribution and migration pattern of the circumferential weld can be integrated. This includes both the spatial distribution of the total hydrogen concentration and the dynamic proportion of the two types of hydrogen concentrations, providing accurate input for subsequent coupling analysis.

[0126] In one possible implementation, hydrogen concentration data The calculation formula is as follows:

[0127]

[0128] in, This represents hydrogen concentration data. Indicates the lattice hydrogen concentration. This indicates the concentration of captured hydrogen.

[0129] In one possible implementation, step S210 described above may include the following steps:

[0130] Step 1: Obtain the trap binding energy of the circumferential weld of the high-grade steel pipe to be treated;

[0131] For example, the trap binding energy is a core parameter reflecting the ability of microscopic traps in the circumferential weld of high-grade steel pipes to capture hydrogen atoms. Its value determines the type of trap (reversible / irreversible) and the adsorption-release characteristics of hydrogen atoms, and is a key prerequisite for establishing the correlation between lattice hydrogen and captured hydrogen.

[0132] Step 2: Determine the third correlation between lattice hydrogen concentration and trapped hydrogen concentration based on the trap binding energy;

[0133] For example, by combining the Oriani equilibrium theory, a dynamic correlation model between lattice hydrogen concentration and trapped hydrogen concentration under different temperatures and stresses is established to clarify the effect of increased dislocation trap density on the proportion of the two types of hydrogen concentrations when plastic strain increases, and to determine the third correlation between lattice hydrogen concentration and trapped hydrogen concentration.

[0134] In one possible implementation, the Oriani equilibrium theory posits that the diffusion and trapping of hydrogen atoms in a metal must reach equilibrium under certain energy conditions, and it specifies the occupancy rate of the trapping sites. With lattice site occupancy

[0135] The relationships between them are represented as follows:

[0136]

[0137]

[0138] in, This represents the trap balance constant. It represents the trap binding energy (i.e., the energy required for a hydrogen atom to escape the trap site and move to a lattice site). Represents the gas constant. This indicates absolute temperature.

[0139] The simplified representation of the relationship between the capture site occupancy and the lattice site occupancy in the above formula is as follows:

[0140]

[0141] Furthermore, according to different The value is taken to obtain the lattice hydrogen concentration. Traps and binding energy Capture point occupancy rate The correlation between (i.e., trap occupancy rate) and other factors is as follows: Figure 3 As shown.

[0142] Larger trap binding energy This results in a higher trap occupancy rate, meaning it absorbs more hydrogen atoms than weak traps. Once hydrogen is present in the system, hydrogen atoms preferentially occupy deep traps. At room temperature and pressure, the theoretical solubility of hydrogen in pipeline steel is approximately 10. -4 wppm, therefore it can be considered that when At a binding energy greater than 60 kJ, all traps in pipeline steel will be saturated. Conversely, traps with a binding energy below 30 kJ will release hydrogen gas.

[0143] In many alloys, especially in bulk cubic lattices, a lattice site occupancy rate is typically assumed. The condition << 1 is expressed as follows:

[0144]

[0145] Furthermore, based on the above formula, the third correlation between lattice hydrogen concentration and captured hydrogen concentration can be derived as follows:

[0146]

[0147] Considering different trap binding energies and plastic strains, under the condition of low trap binding energy, the trapped hydrogen concentration increases with the increase of lattice hydrogen concentration, while for deep traps, the trapped hydrogen concentration is not affected by the lattice hydrogen concentration, which further illustrates that deep traps are irreversible traps.

[0148] When a material is not undergoing plastic deformation, the lattice hydrogen concentration is dominant, but as the material gradually undergoes plastic deformation, the trapped hydrogen concentration increases by several orders of magnitude.

[0149] Step 3: Based on the hydrogen concentration data, the third correlation, and the preset hydrogen diffusion equation, determine the first correlation between hydrogen concentration and stress.

[0150] For example, the first correlation aims to reveal the driving mechanism of stress field on hydrogen diffusion. By incorporating the third correlation into the hydrogen diffusion equation, the diffusion model can simultaneously reflect the hydrogen distribution characteristics and the influence of stress, thus establishing a direct link between hydrogen concentration data and stress for subsequent coupled analysis.

[0151] In one possible implementation, hydrogen atoms in the pipeline steel diffuse through interstitial hopping, i.e., diffusing by jumping from one interstitial site to an adjacent interstitial site. Within a non-equilibrium thermodynamic framework, mass flux derived from the Onsager relation is considered.

[0152] Chemical potential gradient The main driving force for hydrogen diffusion in steel is that hydrogen diffuses from regions of high chemical potential to regions of low chemical potential. Once all atoms have the same chemical potential and the system is in equilibrium, the process stops.

[0153] Therefore, a hydrogen diffusion equation is constructed to determine the hydrogen flux, and a mass balance equation is constructed to determine the correlation between hydrogen flux and hydrogen concentration data, thus obtaining the preset hydrogen diffusion equation.

[0154] For isotropic media, the formula for calculating hydrogen flux is as follows:

[0155]

[0156] in, Indicates hydrogen flux. This represents the Onsager coefficient, which represents the reciprocal relation of Onsager.

[0157] If only lattice flux is considered, the Onsager coefficient is related to the Einstein diffusion equation, and its calculation formula is as follows:

[0158]

[0159] in, Indicates lattice diffusivity, Indicates the lattice hydrogen concentration. Represents the gas constant. This indicates absolute temperature.

[0160] Chemical potential The chemical potential can be expressed as hydrogen concentration, typically including a term dependent on configurational entropy (and therefore occupancy), and the chemical potential under standard conditions. The effect of stress state is considered through a pure expansion term, thus adding a composition term consisting of hydrostatic stress multiplied by the partial molar volume of hydrogen inside the metal. Therefore, the chemical potential... The calculation formula is as follows:

[0161]

[0162] in, Represents the chemical potential under standard conditions. This indicates the partial molar volume of hydrogen in a solid solution (the horizontal line indicates the partial molar amount). This represents hydrostatic stress.

[0163] Furthermore, the updated formula for calculating hydrogen flux is expressed as follows:

[0164]

[0165] according to Simplifying the above equation, we get:

[0166]

[0167] Considering that the concentration at interstitial sites is usually assumed to be constant, this expression can be simplified as follows: Therefore, the above formula can be simplified to:

[0168]

[0169] In one possible implementation, a mass balance equation is constructed based on the hydrogen flux to determine the correlation between hydrogen flux and hydrogen concentration data.

[0170] Assuming the material has no internal hydrogen source, its volume... The change in total hydrogen concentration must be equal to the change in the volume of the material across its surrounding surface. Flux:

[0171]

[0172] in, Indicates the volume of the material. The surface area represents the volume of the material. This represents the outward normal vector of the surface. Indicates hydrogen flux. This represents hydrogen concentration data.

[0173] Calculation formula based on hydrogen concentration data Combining the divergence theorem, we construct the hydrogen diffusion equation, which yields the following formula:

[0174]

[0175]

[0176] In the derivation of the mass balance and Oriani balance above, it is assumed that the trap density is a material property that remains constant throughout the analysis. This applies to most trap types, but not to dislocation trap sites, because the dislocation density varies with the applied load.

[0177] Therefore, to ensure a correct hydrogen balance equation is established, a single-trap model is considered. This is due to the concentration of trapped hydrogen. It depends on the density of dislocation traps, which in turn is related to the plastic deformation of the material, and can be obtained through the chain rule:

[0178]

[0179] Taking the partial derivative with respect to the lattice hydrogen concentration yields:

[0180]

[0181] The above chain rule is then updated to obtain:

[0182]

[0183] Combining the above hydrogen diffusion equation, we obtain the hydrogen diffusion equation considering plastic deformation:

[0184]

[0185] Define the effective diffusion coefficient of hydrogen. for:

[0186]

[0187] Finally, the constitutive equation for hydrogen diffusion considering plastic deformation is constructed, i.e., the pre-defined hydrogen diffusion equation, as follows:

[0188]

[0189] in, Indicates lattice diffusivity, Indicates the lattice hydrogen concentration. This represents the partial molar volume of hydrogen in a solid solution. Indicates hydrostatic stress. Indicates the effective diffusion coefficient of hydrogen. Represents the gas constant. This indicates absolute temperature.

[0190] S220. Based on stress data and a pre-defined hydrogen damage equation, determine the second correlation between hydrogen concentration and stress damage.

[0191] The preset hydrogen damage equation is derived from the material damage theory based on the introduction of hydrogen gas.

[0192] In this step, by incorporating the effects of hydrogen into the damage equation, the accelerating mechanism of hydrogen concentration on material stress damage is revealed. The pre-designed hydrogen damage equation is based on an improvement of CGM damage theory, introducing the hydrogen embrittlement mechanism and combining hydrogen concentration with the processes of void nucleation, growth, and coalescence to achieve a quantitative description of hydrogen-induced damage.

[0193] In one possible implementation, hydrogen concentration data and equivalent plastic strain are substituted into the improved CGM damage equation. By regulating void nucleation and growth through the hydrogen damage factor and combining it with the hydrogen softening-corrected coalescence criterion, a second correlation between hydrogen concentration and stress damage is obtained.

[0194] In one possible implementation, step S220 described above may include the following steps:

[0195] Step 1: Obtain stress data of the circumferential weld of the high-grade steel pipe to be processed;

[0196] The stress data includes equivalent plastic strain data and three-dimensional stress components.

[0197] For example, stress data is the core mechanical input for analyzing hydrogen-induced damage, equivalent plastic strain data reflects the degree of plastic deformation of the circumferential weld of high-grade steel pipes (affecting the density of dislocation traps), and three-dimensional stress components (axial, circumferential, and radial) are the basis for calculating hydrostatic stress, requiring accurate capture of the actual stress state in the circumferential weld material.

[0198] In one possible implementation, a three-dimensional simulation model of the circumferential weld of the high-strength steel pipeline to be processed is established using finite element software to reconstruct the weld groove shape, welding defects (such as incomplete penetration), and connection structure with the base material. Internal pressure, axial tensile load, and temperature boundary conditions consistent with reality are applied, and the equivalent plastic strain distribution of the entire circumferential weld of the high-strength steel pipeline is obtained through numerical solution. At the same time, the axial, circumferential, and radial stress components of each node are extracted and summarized to form complete stress data.

[0199] Step 2: Determine the hydrostatic stress data based on the three-dimensional stress components;

[0200] For example, hydrostatic stress is a key parameter reflecting the trend of material volume deformation and directly affects the diffusion direction of hydrogen atoms (hydrogen tends to accumulate in areas with high hydrostatic stress). Its calculation needs to be based on the statistical average of three-dimensional stress components to ensure that it fits the complex stress state of the circumferential weld of high-grade steel pipes.

[0201] In one possible implementation, for finite element calculations of a hexahedral isoparametric element with 8 integration points, the hydrostatic stress value within the element is... The following can be calculated:

[0202]

[0203] in, Denotes the Gaussian integration point. This represents the interpolation function in global coordinates.

[0204] Next, isoparametric mapping is performed, and the coordinates can be transformed as follows:

[0205]

[0206]

[0207]

[0208] in, Represents a vector of shape functions.

[0209] If the interpolation function in the local coordinates takes the same form as the shape function, then the hydrostatic stress value... It can be represented as follows:

[0210]

[0211] The shape function of a hexahedral isoparametric element can be expressed by the following formula:

[0212]

[0213] in, , ,as well as Let represent the coordinates of the integration points in the isoparametric space, then the shape function of the hexahedral isoparametric element satisfies the following equation:

[0214]

[0215]

[0216]

[0217] Based on the chain rule, the above components are transformed into the global coordinate system as follows:

[0218]

[0219] in, The Jacobian matrix is ​​represented by the derivatives of the global coordinates with respect to the local coordinates:

[0220]

[0221] Finally, the hydrostatic stress value was obtained. The calculation formula is as follows:

[0222]

[0223]

[0224]

[0225] in, This represents a hexahedral isoparametric element with 8 integration points. Indicates the first The hydrostatic stress value at each Gaussian integral point , ,as well as These represent the hydrostatic stress at... , ,as well as The gradient component in the direction.

[0226] Step 3: Substitute the lattice hydrogen concentration, trapped hydrogen concentration, equivalent plastic strain, and hydrostatic stress data into the preset hydrogen damage equation to determine the stress damage data.

[0227] For example, the preset hydrogen damage equation is constructed based on the improved CGM constitutive model, which integrates the coupled influence of hydrogen embrittlement mechanism and mechanical parameters. By substituting multi-dimensional data, the degree of damage evolution of high-grade steel pipe circumferential welds can be quantified, and the core output is the damage variable reflecting the void evolution.

[0228] In one possible implementation, the CGM constitutive model describes the nucleation, growth, and coalescence of material voids, all of which can be accelerated by the addition of hydrogen.

[0229] The pre-defined hydrogen damage equation includes three sub-modules: void nucleation, growth, and coalescence. The equivalent plastic strain is substituted into the dislocation trap density formula to regulate the contribution of the trapped hydrogen concentration. The damage factor is used to correlate the two types of hydrogen concentrations with void nucleation and growth rates.

[0230] The hydrogen damage factor is calculated as follows:

[0231]

[0232] in, This represents the void growth rate calculated in the absence of hydrogen.

[0233] However, the above-mentioned method for calculating the hydrogen damage factor only considers the effect of hydrogen on pore growth, neglecting its influence on pore nucleation and aggregation, and also ignores the effect of captured hydrogen concentration. Therefore, considering the captured hydrogen concentration, the calculation formula for the hydrogen damage factor is updated to obtain a preset hydrogen damage equation, i.e., the formula for calculating the volume fraction of accelerated pores caused by hydrogen:

[0234]

[0235]

[0236] in, This represents the nucleation and growth rate calculated in the absence of hydrogen. , , ,as well as These represent the hydrogen damage factors that need to be calibrated.

[0237] In addition to considering hydrogen-accelerated void growth and nucleation, it may be necessary to further adjust the void coalescence criterion to take into account the influence of hydrogen, resulting in the rheological stress after hydrogen softening, which is corrected by combining hydrostatic stress data. The calculation formula is shown below:

[0238]

[0239] in, This represents the rheological stress considering the influence of hydrogen. Indicates the hydrogen softening coefficient. Indicates the initial lattice hydrogen concentration. This represents the coefficient that determines the plateau value under rheological stress.

[0240] By combining hydrostatic stress data to correct the rheological stress after hydrogen softening, and then substituting it into the Thomason coalescence criterion, the influence of hydrogen on void coalescence is further considered. Introducing different softening factors can simulate the sensitivity of different materials to hydrogen.

[0241] Based on the Thomason coalescence criterion, the maximum principal stress of the plastic ultimate load. The calculation is as follows:

[0242]

[0243] in, Indicates the maximum principal stress. This represents the flow stress (here referring to the rheological stress considering the influence of hydrogen as described above). (Substitute) and This represents the Thomason constant. The porosity is expressed by the following formula:

[0244]

[0245] in, Indicates the void volume fraction. and These represent the second principal strain and the third principal strain of the material, respectively.

[0246] Based on the data of lattice hydrogen concentration, trapped hydrogen concentration, equivalent plastic strain, and hydrostatic stress, the void volume fraction and the hydrogen damage factor that needs to be calibrated in each region are obtained through numerical calculation, i.e., stress damage data.

[0247] Step 4: Based on the stress damage data and hydrogen concentration data, determine the second correlation between hydrogen concentration and stress damage.

[0248] For example, the second correlation is the quantitative mapping law between hydrogen concentration and stress damage. It is necessary to establish a functional relationship by fitting multiple sets of data to clarify the difference in damage evolution rate under different hydrogen concentrations, so as to provide a basis for subsequent coupling analysis.

[0249] In one possible implementation, hydrogen concentration data (total hydrogen concentration, lattice hydrogen / captured hydrogen ratio) and corresponding stress damage data (hydrogen damage factor, void volume fraction) are extracted from different regions of the circumferential weld of high-grade steel pipes to construct a data sample set.

[0250] Linear regression or nonlinear fitting methods are used to analyze the trend of damage variables with total hydrogen concentration. At the same time, the contribution weights of lattice hydrogen and trapped hydrogen are distinguished. Finally, a multivariate functional relationship of damage variables with hydrogen concentration and equivalent plastic strain is established, namely the second correlation relationship, so as to achieve the goal of rapidly predicting the degree of stress damage from hydrogen concentration.

[0251] S230. Based on the first correlation relationship, the second correlation relationship, and the preset damage coupling model, determine the coupling relationship between hydrogen diffusion and stress.

[0252] In this step, the first and second correlation relationships are integrated according to the preset damage coupling model to achieve bidirectional coupling between hydrogen diffusion and stress field.

[0253] For example, the pre-defined damage coupling model reflects both the stress-driven hydrogen diffusion in the first correlation and the hydrogen-accelerated damage in the second correlation, forming a closed-loop coupling logic.

[0254] In one possible implementation, the first and second correlation relationships are embedded into a pre-defined damage coupling model, and the stress gradient, plastic strain and hydrogen concentration data are transmitted in real time through the UEXTERNALDB subroutine to determine the bidirectional coupling relationship between hydrogen diffusion and stress.

[0255] In one possible implementation, the method for assessing hydrogen damage in the circumferential weld of a high-strength steel pipe further includes the following steps:

[0256] Step 1: Based on the finite element user dynamic subroutine, obtain hydrostatic stress data, lattice hydrogen concentration, and captured hydrogen concentration;

[0257] For example, key parameters of the circumferential weld of a high-grade steel pipeline can be acquired in real time during the coupled simulation process through dynamic interaction of a user-defined subroutine in the finite element method. Hydrostatic stress data is the core driving force for hydrogen diffusion, while lattice hydrogen and trapped hydrogen concentrations reflect the distribution pattern of hydrogen. All three must be collected synchronously to ensure the accuracy of the coupled updates.

[0258] In one possible implementation, a fully coupled simulation platform for the circumferential weld of high-strength steel pipelines is built based on ABAQUS software. The three-dimensional stress components are calculated and the hydrostatic stress is derived through the UMAT subroutine. The hydrogen diffusion equation is solved through the UMATHT subroutine to obtain the lattice hydrogen concentration and the captured hydrogen concentration. Finally, a data sharing channel is established with the help of the UEXTERNALDB subroutine to read the calculation results of the two subroutines in real time, so as to realize the synchronous acquisition and transmission of the three types of parameters.

[0259] Step 2: Substitute the hydrostatic stress data, lattice hydrogen concentration, and captured hydrogen concentration into the preset hydrogen diffusion equation and preset hydrogen damage equation, respectively, and update the first correlation and the second correlation.

[0260] For example, by using real-time acquired parameters, namely hydrostatic stress data, lattice hydrogen concentration, and captured hydrogen concentration, the correlation between hydrogen concentration and stress, and between hydrogen concentration and stress damage, can be dynamically corrected to ensure that the coupling relationship fits the state of the circumferential weld of high-grade steel pipes and avoid simulation deviations caused by fixed correlation.

[0261] In one possible implementation, hydrostatic stress data is substituted into the hydrogen diffusion equation with hydrostatic stress gradient terms added, and the hydrogen flux and concentration field distribution are recalculated by combining real-time lattice hydrogen concentration and captured hydrogen concentration, thus updating the first correlation of "stress-driven hydrogen diffusion".

[0262] Simultaneously, the three types of parameters are substituted into the improved CGM hydrogen damage equation. The nucleation and growth rates of voids are adjusted through the hydrogen damage factor, and the second correlation of "hydrogen-accelerated stress damage" is modified by combining the hydrogen softening and coalescence criterion. After each finite element iteration calculation, the above substitution and update process is repeated to achieve dynamic optimization of the correlation.

[0263] The hydrogen damage assessment method for high-strength steel pipe circumferential welds according to this application first determines the first correlation between hydrogen concentration and stress based on hydrogen concentration data and a preset hydrogen diffusion equation. The preset hydrogen diffusion equation is derived based on the law of conservation of mass and by introducing a preset stress parameter term. Then, based on stress data and a preset hydrogen damage equation, a second correlation between hydrogen concentration and stress damage is determined. The preset hydrogen damage equation is derived based on the material damage theory that introduces hydrogen. Finally, based on the first correlation, the second correlation, and a preset damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined. In this embodiment, by deriving the hydrogen diffusion equation and combining it with the law of conservation of mass and stress parameters, the diffusion behavior of hydrogen in the material can be clearly quantified, providing a solid theoretical foundation for subsequent analysis. Furthermore, determining the relationship between hydrogen concentration and stress helps identify how stress affects the diffusion characteristics of hydrogen. Introducing the damage effect of hydrogen on the material using a pre-defined hydrogen damage equation effectively assesses the impact of hydrogen concentration on material properties and reveals how stress states affect the degree of hydrogen-induced damage. By combining stress data with the hydrogen damage equation, the specific impact of hydrogen on material damage under different stress states can be quantified. Combining the first and second correlations with the damage coupling model, the complex coupling relationship between hydrogen diffusion and stress can be comprehensively described, improving the prediction accuracy of the hydrogen damage evolution process and the assessment accuracy of hydrogen damage.

[0264] Based on the above embodiments, the following are embodiments of the apparatus involved in this application:

[0265] Figure 4 This is a schematic diagram of the structure of a hydrogen damage assessment device for circumferential welds of high-strength steel pipelines provided in an embodiment of this application. Figure 4 As shown, the hydrogen damage assessment device 400 for the circumferential weld of the high-strength steel pipeline includes:

[0266] Module 410 is used to determine the hydrogen concentration data and stress data when hydrogen diffuses in the circumferential weld of the high-grade steel pipe to be treated.

[0267] The processing module 420 is used to determine the coupling relationship between hydrogen diffusion and stress based on hydrogen concentration data, stress data, and a preset damage coupling model.

[0268] Evaluation module 430 is used to evaluate hydrogen damage to the circumferential weld of the high-grade steel pipe under treatment based on the coupling relationship and using the finite element method to determine the damage information.

[0269] In one or more embodiments, the processing module 420 is specifically used for:

[0270] Based on hydrogen concentration data and a pre-defined hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined. The pre-defined hydrogen diffusion equation is derived based on the law of conservation of mass and by introducing a pre-defined stress parameter term.

[0271] Based on stress data and a pre-defined hydrogen damage equation, a second correlation between hydrogen concentration and stress damage is determined. The pre-defined hydrogen damage equation is derived from the material damage theory based on the introduction of hydrogen gas.

[0272] Based on the first correlation, the second correlation, and the pre-defined damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined.

[0273] In one or more embodiments, before determining the first correlation between hydrogen concentration and stress based on hydrogen concentration data and a preset hydrogen diffusion equation, the processing module 420 is further configured to:

[0274] Obtain the lattice hydrogen concentration and captured hydrogen concentration of the circumferential weld of the high-grade steel pipe to be treated;

[0275] Hydrogen concentration data are determined based on lattice hydrogen concentration and captured hydrogen concentration.

[0276] In one or more embodiments, the processing module 420 determines a first correlation between hydrogen concentration and stress based on hydrogen concentration data and a preset hydrogen diffusion equation, specifically for:

[0277] Obtain the trap binding energy of the circumferential weld of the high-grade steel pipe to be treated;

[0278] Based on the trap binding energy, a third correlation between lattice hydrogen concentration and trapped hydrogen concentration is determined;

[0279] Based on hydrogen concentration data, the third correlation, and the pre-defined hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined.

[0280] In one or more embodiments, the processing module 420 determines a second correlation between hydrogen concentration and stress damage based on stress data and a preset hydrogen damage equation, specifically for:

[0281] Obtain stress data of the circumferential weld of the high-grade steel pipe to be processed, including equivalent plastic strain data and three-dimensional stress components.

[0282] Determine hydrostatic stress data based on three-dimensional stress components;

[0283] Substitute the data of lattice hydrogen concentration, trapped hydrogen concentration, equivalent plastic strain, and hydrostatic stress into the preset hydrogen damage equation to determine the stress damage data.

[0284] Based on stress damage data and hydrogen concentration data, a second correlation between hydrogen concentration and stress damage was determined.

[0285] In one or more embodiments, the processing module 420 is further configured to:

[0286] Based on the finite element user dynamic subroutine, hydrostatic stress data, lattice hydrogen concentration, and captured hydrogen concentration are obtained;

[0287] The hydrostatic stress data, lattice hydrogen concentration, and captured hydrogen concentration are substituted into the preset hydrogen diffusion equation and preset hydrogen damage equation, respectively, to update the first and second correlation relationships.

[0288] The hydrogen damage assessment device for high-grade steel pipe circumferential welds provided in this embodiment can perform the method provided in the above-described method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0289] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 5 As shown, the electronic device 500 includes: a processor 510, a memory 520, and a bus 530;

[0290] The memory 520 is used to store the computer-executed instructions of the processor 510;

[0291] The processor 510 is configured to execute the technical solutions of any of the foregoing method embodiments by executing computer execution instructions.

[0292] The specific implementation process of processor 510 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0293] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0294] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0295] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0296] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0297] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0298] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random-Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0299] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an application-specific integrated circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0300] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0301] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0302] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0303] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory (RAM), magnetic disks, or optical disks.

[0304] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0305] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for assessing hydrogen damage in circumferential welds of high-strength steel pipelines, characterized in that, include: Determine the hydrogen concentration and stress data during hydrogen diffusion in the circumferential weld of the high-grade steel pipe to be treated; Based on the hydrogen concentration data, the stress data, and the preset damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined; Based on the aforementioned coupling relationship, the hydrogen damage of the circumferential weld of the high-grade steel pipeline to be treated is evaluated using the finite element method to determine the damage information.

2. The method according to claim 1, characterized in that, The step of determining the coupling relationship between hydrogen diffusion and stress based on the hydrogen concentration data, the stress data, and a preset damage coupling model includes: Based on the hydrogen concentration data and the preset hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined. The preset hydrogen diffusion equation is derived based on the law of conservation of mass and by introducing a preset stress parameter term. Based on the stress data and the preset hydrogen damage equation, a second correlation between hydrogen concentration and stress damage is determined. The preset hydrogen damage equation is derived from the material damage theory based on the introduction of hydrogen gas. Based on the first correlation, the second correlation, and the preset damage coupling model, the coupling relationship between hydrogen diffusion and stress is determined.

3. The method according to claim 2, characterized in that, Before determining the first correlation between hydrogen concentration and stress based on the hydrogen concentration data and a preset hydrogen diffusion equation, the method further includes: Obtain the lattice hydrogen concentration and captured hydrogen concentration of the circumferential weld of the high-grade steel pipe to be treated; The hydrogen concentration data is determined based on the lattice hydrogen concentration and the captured hydrogen concentration.

4. The method according to claim 3, characterized in that, The step of determining the first correlation between hydrogen concentration and stress based on the hydrogen concentration data and a preset hydrogen diffusion equation includes: Obtain the trap binding energy of the circumferential weld of the high-grade steel pipe to be treated; Based on the trap binding energy, a third correlation is determined between the lattice hydrogen concentration and the trapped hydrogen concentration; Based on the hydrogen concentration data, the third correlation, and the preset hydrogen diffusion equation, the first correlation between hydrogen concentration and stress is determined.

5. The method according to claim 3 or 4, characterized in that, The step of determining the second correlation between hydrogen concentration and stress damage based on the stress data and a preset hydrogen damage equation includes: Obtain the stress data of the circumferential weld of the high-grade steel pipe to be processed, the stress data including equivalent plastic strain data and three-dimensional stress components; Based on the three-dimensional stress components, the hydrostatic stress data are determined; Substitute the lattice hydrogen concentration, the trapped hydrogen concentration, the equivalent plastic strain, and the hydrostatic stress data into a preset hydrogen damage equation to determine the stress damage data. Based on the stress damage data and the hydrogen concentration data, a second correlation between hydrogen concentration and stress damage is determined.

6. The method according to claim 5, characterized in that, The method further includes: Based on the finite element user dynamic subroutine, the hydrostatic stress data, the lattice hydrogen concentration, and the captured hydrogen concentration are obtained; The hydrostatic stress data, the lattice hydrogen concentration, and the captured hydrogen concentration are substituted into the preset hydrogen diffusion equation and the preset hydrogen damage equation, respectively, to update the first correlation and the second correlation.

7. A hydrogen damage assessment device for circumferential welds of high-grade steel pipelines, characterized in that, include: The determination module is used to determine the hydrogen concentration data and stress data when hydrogen diffuses in the circumferential weld of the high-grade steel pipe to be treated; The processing module is used to determine the coupling relationship between hydrogen diffusion and stress based on the hydrogen concentration data, the stress data, and a preset damage coupling model. The evaluation module is used to evaluate the hydrogen damage of the circumferential weld of the high-grade steel pipe to be treated based on the coupling relationship and using the finite element method to determine the damage information.

8. An electronic device, characterized in that, include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-6.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method described in any one of claims 1-6.

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