Method, device and storage medium for stress simulation analysis of plastic alloy pipe

Abstract

This application provides a method, equipment, and storage medium for stress simulation analysis of plastic alloy pipes, relating to the performance evaluation of non-metallic pipes in oil and gas fields. Based on a three-dimensional model of the plastic alloy pipe, the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe are constructed according to the structural and mechanical characteristic parameters of the plastic alloy pipe, and the mechanical characteristics of the metal joint are also constructed, resulting in a reinforced three-dimensional model. The plastic alloy pipe includes both the plastic alloy pipe and the metal joint. The reinforced three-dimensional model is meshed to obtain a three-dimensional mesh model. Based on the three-dimensional mesh model, the composite material homogenization Halpin-Tsai model method is used to simulate the reinforcing layer to simulate its performance parameters. Based on the three-dimensional mesh model, the performance parameters of the reinforcing layer, and the set loads and boundary conditions, mechanical simulation experiments are conducted to obtain the mechanical simulation results of the plastic alloy pipe, thereby accurately evaluating whether the plastic alloy pipe meets the usage requirements under specific working conditions.

Description

Technical Field

[0001] This application relates to the technical field of performance evaluation of non-metallic pipes in oil and gas fields, and in particular to a method, equipment and storage medium for stress simulation analysis of plastic alloy pipes. Background Technology

[0002] The use of plastic alloy pipes in oil and gas fields is becoming increasingly widespread, primarily due to their advantages such as corrosion resistance, lightweight, and ease of installation. However, ensuring their safety and reliability is crucial in the harsh environments of oil and gas fields. Therefore, stress evaluation of plastic alloy pipes has become a key issue in ensuring operational safety.

[0003] In related technologies, the stress value of plastic alloy pipe is determined based on the thermal expansion coefficient of the plastic alloy pipe and the actual operating temperature. If the stress value does not exceed the yield strength of the material used in the plastic alloy pipe, the plastic alloy pipe is deemed to meet the usage requirements under specific operating conditions.

[0004] However, even after evaluating plastic alloy pipes to ensure they meet specific operating conditions using the methods described above, failures still occur at the metal joints during use. Therefore, there is an urgent need for a solution that can accurately assess whether plastic alloy pipes meet the operating requirements for specific conditions. Summary of the Invention

[0005] This application provides a method, equipment, and storage medium for stress simulation analysis of plastic alloy pipes, which can accurately assess whether plastic alloy pipes meet the usage requirements of specific working conditions, avoid stress concentration, and reduce the risk of failure of plastic alloy pipe joints.

[0006] In a first aspect, this application provides a method for stress simulation analysis of plastic alloy pipes, including:

[0007] Obtain a 3D model of the plastic alloy pipe, which includes a plastic alloy pipe and a metal joint. The plastic alloy pipe contains multiple fiber layups with resin bonding layers between the layers.

[0008] Based on the three-dimensional model, the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe are constructed according to the structural and mechanical characteristic parameters of the plastic alloy pipe, as well as the mechanical characteristics of the metal joint, to obtain the enhanced three-dimensional model.

[0009] The enhanced 3D model is meshed to obtain a 3D mesh model;

[0010] Based on a three-dimensional mesh model, the composite material homogenization Halpin-Tsai model method is used to simulate the reinforcing layer in order to simulate the corresponding performance parameters of the reinforcing layer; among which, the performance parameters include the coefficient of thermal expansion, elastic modulus, Poisson's ratio and anisotropy;

[0011] Based on the performance parameters of the reinforcing layer and the set load and boundary conditions, mechanical simulation experiments were conducted to obtain the mechanical simulation results of the plastic alloy pipe.

[0012] In one possible implementation, based on a three-dimensional model, and according to the structural and mechanical characteristic parameters of the plastic alloy pipe, the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe are constructed, including:

[0013] Based on the three-dimensional model, the fiber orientation of each fiber layup is determined according to the main axis direction of the plastic alloy pipe.

[0014] Based on the fiber orientation of each fiber layup, material properties are set for the fiber layup according to the structural parameters of the plastic alloy pipe;

[0015] Based on the mechanical characteristic parameters, the mechanical characteristics of different fiber layups are set.

[0016] In one possible implementation, the enhanced 3D model is meshed to obtain a 3D mesh model, including:

[0017] The shell element (SHELL281) was used to mesh the enhanced 3D model, and the mesh was refined at the contact points between the plastic alloy pipe and the metal joint to obtain a 3D mesh model.

[0018] In one possible implementation, based on the performance parameters corresponding to the reinforcing layer and the set loads and boundary conditions, a mechanical simulation test is conducted to obtain the mechanical simulation results of the plastic alloy pipe, including:

[0019] The external load on the buried pipeline is treated as a uniformly distributed constant load. Reference points are established at the center of the two ends of the plastic alloy pipeline as the load application positions, and the pipeline end points are coupled to the end nodes of the metal joints.

[0020] Based on actual operating conditions, a uniform internal pressure load is applied inside the plastic alloy pipe, and a tensile load is applied to both ends of the plastic alloy pipe to simulate the axial expansion deformation of the pipe section in the pipeline under internal pressure.

[0021] Based on the performance parameters corresponding to the reinforcing layer, mechanical simulation experiments were conducted to obtain the mechanical simulation results of the plastic alloy pipe.

[0022] In one possible implementation, based on the performance parameters corresponding to the reinforcing layer, a mechanical simulation test is conducted to obtain the mechanical simulation results of the plastic alloy pipe, including:

[0023] Using the built-in solver of the finite element method software, mechanical simulation experiments were conducted based on the performance parameters corresponding to the reinforcement layer to obtain the mechanical simulation results of the plastic alloy pipe.

[0024] In one possible implementation, obtaining a three-dimensional model of the plastic alloy tube includes:

[0025] To obtain the basic property parameters of plastic alloy pipes, which include plastic alloy tubing and metal fittings, the plastic alloy tubing contains multiple fiber layups. The basic property parameters include: structural parameters, dimensional parameters, and mechanical characteristic parameters.

[0026] Based on the dimensional parameters of the plastic alloy pipe, a 3D model of the plastic alloy pipe is constructed; and based on the dimensional parameters of the metal joint, a 3D model of the metal joint is constructed.

[0027] Based on the 3D model of the plastic alloy pipe and the 3D model of the metal joint, the plastic alloy pipe and the metal joint are assembled and connected according to the positional relationship of the application, and the 3D model of the plastic alloy pipe is obtained.

[0028] In one possible implementation, the mechanical simulation results include predicted stress distribution results, and further include:

[0029] If the results of mechanical simulation indicate that the plastic alloy pipe does not meet the usage requirements under specific working conditions, then the structural parameters of the plastic alloy pipe should be adjusted and optimized based on the mechanical simulation results.

[0030] Secondly, this application provides a stress simulation and analysis device for plastic alloy pipes, comprising:

[0031] The acquisition module is used to acquire a three-dimensional model of the plastic alloy pipe, which includes a plastic alloy pipe and a metal joint. The plastic alloy pipe contains multiple fiber layups with resin bonding layers between the layers.

[0032] The processing module is used to construct the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe based on the three-dimensional model and the structural and mechanical characteristic parameters of the plastic alloy pipe, as well as to construct the mechanical characteristics of the metal joint, to obtain an enhanced three-dimensional model; and to perform mesh generation on the enhanced three-dimensional model to obtain a three-dimensional mesh model.

[0033] The simulation module is used to simulate the reinforcing layer based on a three-dimensional mesh model using the composite material homogenization Halpin-Tsai model method, in order to simulate the corresponding performance parameters of the reinforcing layer. These performance parameters include the coefficient of thermal expansion, elastic modulus, Poisson's ratio, and anisotropy. Based on the performance parameters of the reinforcing layer and the set loads and boundary conditions, mechanical simulation tests are conducted to obtain the mechanical simulation results of the plastic alloy pipe.

[0034] In one possible implementation, the processing module is specifically used for:

[0035] Based on the three-dimensional model, the fiber orientation of each fiber layup is determined according to the main axis direction of the plastic alloy pipe.

[0036] Based on the fiber orientation of each fiber layup, material properties are set for the fiber layup according to the structural parameters of the plastic alloy pipe;

[0037] Based on the mechanical characteristic parameters, the mechanical characteristics of different fiber layups are set.

[0038] In one possible implementation, the processing module is further configured to:

[0039] The shell element (SHELL281) was used to mesh the enhanced 3D model, and the mesh was refined at the contact points between the plastic alloy pipe and the metal joint to obtain a 3D mesh model.

[0040] In one possible implementation, the simulation module is specifically used for:

[0041] The external load on the buried pipeline is treated as a uniformly distributed constant load. Reference points are established at the center of the two ends of the plastic alloy pipeline as the load application positions, and the pipeline end points are coupled to the end nodes of the metal joints.

[0042] Based on actual operating conditions, a uniform internal pressure load is applied inside the plastic alloy pipe, and a tensile load is applied to both ends of the plastic alloy pipe to simulate the axial expansion deformation of the pipe section in the pipeline under internal pressure.

[0043] Based on the performance parameters corresponding to the reinforcing layer, mechanical simulation experiments were conducted to obtain the mechanical simulation results of the plastic alloy pipe.

[0044] In one possible implementation, the simulation module is also used to: use the solver built into the finite element software to conduct mechanical simulation tests based on the performance parameters corresponding to the reinforcement layer, and obtain the mechanical simulation results of the plastic alloy pipe.

[0045] In one possible implementation, the acquisition module is specifically used for:

[0046] To obtain the basic property parameters of plastic alloy pipes, which include plastic alloy tubing and metal fittings, the plastic alloy tubing contains multiple fiber layups. The basic property parameters include: structural parameters, dimensional parameters, and mechanical characteristic parameters.

[0047] Based on the dimensional parameters of the plastic alloy pipe, a 3D model of the plastic alloy pipe is constructed; and based on the dimensional parameters of the metal joint, a 3D model of the metal joint is constructed.

[0048] Based on the 3D model of the plastic alloy pipe and the 3D model of the metal joint, the plastic alloy pipe and the metal joint are assembled and connected according to the positional relationship of the application, and the 3D model of the plastic alloy pipe is obtained.

[0049] In one possible implementation, the mechanical simulation results include predicted stress distribution results. Correspondingly, the plastic alloy pipe stress simulation analysis device further includes an optimization module, used to optimize the plastic alloy pipe by adjusting its structural parameters based on the mechanical simulation results when the plastic alloy pipe is assessed to not meet the usage requirements under specific working conditions.

[0050] Thirdly, this application provides an electronic device, including: a memory and a processor;

[0051] The memory stores instructions that the computer executes;

[0052] The processor executes computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0053] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible embodiments of the first aspect.

[0054] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0055] The stress simulation analysis method, equipment, and storage medium for plastic alloy pipes provided in this application construct a corresponding reinforced 3D model based on the structural and mechanical characteristic parameters of the plastic alloy pipe obtained from its 3D model. This reinforced 3D model can simulate the mechanical characteristics of different layers in the plastic alloy pipe, helping to improve the accuracy of mechanical simulation test results. A 3D mesh model is obtained by meshing the reinforced 3D model. This 3D mesh model can accurately simulate the complex deformation and stress conditions of the plastic alloy pipe. The Halpin-Tsai model method is used to simulate the reinforcing layer in the plastic alloy pipe, treating the reinforcing layer as a whole and simulating its overall performance on a macroscopic scale. The interaction between different fiber layers is considered, reducing computational complexity and improving the efficiency of mechanical simulation tests. Based on the performance parameters corresponding to the reinforcing layer and the set loads and boundary conditions, mechanical simulation tests are conducted to obtain the mechanical simulation results of the plastic alloy pipe, achieving the effect of accurately predicting the mechanical properties of the plastic alloy pipe. Attached Figure Description

[0056] 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.

[0057] Figure 1 A flowchart illustrating a stress simulation analysis method for plastic alloy pipes provided in this application embodiment. Figure 1 ;

[0058] Figure 2 A flowchart illustrating a stress simulation analysis method for plastic alloy pipes provided in this application embodiment. Figure 2 ;

[0059] Figure 3 A schematic diagram of a three-dimensional model of a metal joint provided in an embodiment of this application;

[0060] Figure 4 This is a schematic diagram of a three-dimensional model of a plastic alloy pipe provided in an embodiment of this application;

[0061] Figure 5 Schematic diagram of fiber layup of plastic alloy tube provided in the embodiments of this application Figure 1 ;

[0062] Figure 6 Schematic diagram of fiber layup of plastic alloy tube provided in the embodiments of this application Figure 2 ;

[0063] Figure 7 This is a schematic diagram of the three-dimensional mesh model structure provided in the embodiments of this application;

[0064] Figure 8 A schematic diagram of mechanical simulation results provided for embodiments of this application;

[0065] Figure 9 A flowchart illustrating a stress simulation analysis method for plastic alloy pipes provided in this application embodiment. Figure 3 ;

[0066] Figure 10 This is a schematic diagram of the structure of the stress simulation and analysis device for plastic alloy pipes provided in the embodiments of this application;

[0067] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0068] 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

[0069] 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.

[0070] In related technologies, the suitability of plastic alloy pipes for specific operating conditions is assessed by calculating their coefficient of thermal expansion and stress values ​​at the actual operating temperature. If the stress value does not exceed the yield strength of the plastic alloy pipe, it is considered suitable for that condition. However, with the large-scale application of plastic alloy pipes, failures at their metal joints are becoming increasingly common, rendering the current stress value evaluation method ineffective in assessing their stress state under operating conditions. Therefore, there is an urgent need for more precise technical means to evaluate whether plastic alloy pipes meet the requirements of specific operating conditions, thereby improving their reliability and safety in oil and gas field applications.

[0071] The stress simulation analysis method for plastic alloy pipes provided in this application treats the composite material reinforcing layer in the plastic alloy pipe as an orthotropic homogeneous material and constructs a model of the plastic alloy pipe using an interlaced winding design. A resin adhesive layer is set at the joint between the layers of the plastic alloy pipe model. Parameters such as layup angle, layup thickness, adhesive layer thickness, fiber layer type, and adhesive layer type are set in the three-dimensional model of the plastic alloy pipe according to actual conditions to simulate the composite material in the actual plastic alloy pipe to the greatest extent possible, obtaining a reinforced three-dimensional model. In the reinforced three-dimensional model, stress transmission and defect growth processes in the plastic alloy pipe are more accurate. The composite material homogenization Halpin-Tsai model method is used to simulate the reinforcing layer, treating it as an orthotropic homogeneous material, making the results of the mechanical simulation test of the plastic alloy pipe more instructive. By analyzing the mechanical simulation test results, the mechanical properties of the plastic alloy pipe can be accurately predicted, and stress failure at joints can be reduced.

[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 a stress simulation analysis method for plastic alloy pipes provided in this application embodiment. Figure 1 .like Figure 1 As shown, the method includes:

[0074] S101. Obtain a three-dimensional model of the plastic alloy pipe, which includes a plastic alloy pipe and a metal joint. The plastic alloy pipe contains multiple fiber layups with resin bonding layers between the layers.

[0075] Plastic alloy pipes are composed of an inner layer, a middle layer, and an outer layer, combining the advantages of different materials for applications requiring corrosion resistance, lightweight, and high strength. These pipes include multiple fiber layups, which enhance their strength and pressure resistance. A resin bonding layer between the layers strengthens the bond between the different fiber layers, achieving uniform stress distribution, reducing localized stress concentration, and lowering the risk of material fatigue and failure.

[0076] Metal fittings are a key component of plastic alloy pipes, ensuring the integrity and sealing of the entire piping system. The 3D model of the plastic alloy pipe accurately reflects the assembly and connection between the pipe and the metal fitting. In practical applications, different types of plastic alloy pipes can be assembled using metal fittings, or plastic alloy pipes can be assembled with metal components. This connection method is very common in piping engineering and is mainly used for connecting various piping systems.

[0077] S102. Based on the three-dimensional model, according to the structural parameters and mechanical characteristic parameters of the plastic alloy pipe, construct the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe, as well as construct the mechanical characteristics of the metal joint, to obtain the enhanced three-dimensional model.

[0078] The structural parameters of plastic alloy pipes are key indicators describing their geometry. Optionally, structural parameters include: pipe diameter, wall thickness, fiber type, fiber layup angle, number of fiber layers, fiber layer thickness, and adhesive layer thickness. The mechanical characteristic parameters of plastic alloy pipes represent their mechanical properties and behavior under various force and environmental conditions. These mechanical characteristic parameters include, for example, the radial tensile strength, axial tensile strength, elastic modulus, and Poisson's ratio of the plastic alloy pipe. The mechanical characteristic parameters of metal joints represent their mechanical properties and behavior under various force and environmental conditions, and may, for example, include the radial tensile strength, axial tensile strength, elastic modulus, and Poisson's ratio of the metal joint.

[0079] In this step, by setting corresponding material properties and mechanical characteristics for the plastic alloy pipe in the 3D model, and setting corresponding mechanical characteristics for the metal joint, the properties of the plastic alloy pipe are further accurately described, resulting in an enhanced 3D model that accurately reflects the actual structure and properties of the plastic alloy pipe. This enhanced 3D model can accurately reflect the geometry and mechanical characteristics of the plastic alloy pipe, ensuring more accurate results from mechanical simulation experiments.

[0080] S103. Mesh the enhanced 3D model to obtain a 3D mesh model.

[0081] Meshing is the process of breaking down an augmented 3D model into smaller, more manageable structures based on its shape and the requirements of mechanical simulation.

[0082] Based on the shape of the enhanced 3D model, appropriate element types are selected, and meshing parameters are set to determine the size, shape, and distribution of the mesh. This meshing process generates the corresponding 3D mesh model. Through reasonable and appropriate meshing, more microscopic information within the plastic alloy pipe model can be captured, revealing detailed information such as the mechanical changes and structural deformations of local structures within the plastic alloy pipe, accurately simulating the impact of actual working conditions on the plastic alloy pipe.

[0083] S104. Based on a three-dimensional mesh model, the composite material homogenization Halpin-Tsai model method is used to simulate the reinforcing layer in order to simulate the performance parameters corresponding to the reinforcing layer.

[0084] Optionally, performance parameters may include, for example, the coefficient of thermal expansion, the modulus of elasticity, Poisson's ratio, and anisotropy. The coefficient of thermal expansion is a coefficient that describes the regularity of changes in the geometric properties of a material with temperature under the influence of thermal expansion and contraction. The modulus of elasticity is a physical quantity that measures a material's resistance to elastic deformation, reflecting the ratio of stress to strain within the elastic range. Poisson's ratio is the ratio of the absolute values ​​of the transverse normal strain to the axial normal strain when a material is under uniaxial tension or compression. Anisotropy refers to the change in all or part of a material's chemical and physical properties with changing direction, exhibiting different properties in different directions.

[0085] The purpose of composite material homogenization is to transform complex structures into homogeneous materials, enabling better design and analysis of the overall properties of composites. The Halpin-Tsai model can evaluate the hardness and expansion properties of oriented fiber composites, and is suitable for describing the mechanical properties of polymers with continuous or discontinuous phases. It is also suitable for simulating the properties of composite materials where the load direction is along the discontinuous fiber direction. The reinforcing layer comprises different fiber layups within the plastic alloy tube.

[0086] Because of the differences in fiber layup angles and fiber layer thicknesses among different fiber layups, their mechanical characteristics vary, leading to high computational complexity and difficulty in mechanical simulations. Furthermore, the interactions between different fiber layups cannot be fully considered, resulting in low simulation accuracy. Therefore, the composite material homogenization Halpin-Tsai model method is used to simulate the reinforcing layer, treating different fiber layups as a whole to form the reinforcing layer. Simultaneously, the entire reinforcing layer is considered as having resin adhesive layers between layers and an orthotropic homogeneous material within the layers, where the homogeneous material is interwoven within the layers. The composite material homogenization Halpin-Tsai model method is used to simulate the interactions between different fiber layers, obtaining the corresponding performance parameters of the reinforcing layer. Mechanical simulation experiments using the obtained performance parameters of the reinforcing layer can reduce experimental complexity and computational load.

[0087] S105. Based on the performance parameters corresponding to the reinforcing layer and the set load and boundary conditions, mechanical simulation tests are conducted to obtain the mechanical simulation results of the plastic alloy pipe.

[0088] Here, load refers to the external force and influencing factors acting on the plastic alloy tube; boundary conditions are the constraints and limitations on the plastic alloy tube during mechanical simulation experiments, describing the tube's degrees of freedom and fixed points. Mechanical simulation experiments are the process of simulating and analyzing the mechanical behavior of plastic alloy tubes under boundary conditions using computer software.

[0089] Based on the performance parameters of the reinforcing layer and the set loads and boundary conditions, mechanical simulation tests were conducted. The obtained mechanical simulation results of the plastic alloy pipe were used to predict actual usage conditions and evaluate whether the plastic alloy pipe meets the usage requirements under specific working conditions.

[0090] The stress simulation analysis method for plastic alloy pipes provided in this application obtains a three-dimensional model of the plastic alloy pipe and sets corresponding parameters for the three-dimensional model according to the structural and mechanical characteristic parameters of the plastic alloy pipe to obtain an enhanced three-dimensional model. The enhanced three-dimensional model can simulate the mechanical characteristics of different layers in the plastic alloy pipe, helping to improve the accuracy of mechanical simulation test results. The enhanced three-dimensional model is meshed to obtain a three-dimensional mesh model. The three-dimensional mesh model can more accurately simulate the complex deformation and stress conditions of the plastic alloy pipe, providing more accurate simulation test results. The Halpin-Tsai model method is used to simulate the reinforcing layer in the plastic alloy pipe, simulating the overall performance of the reinforcing layer on a macroscopic scale, reducing the computational load of the simulation test and improving the efficiency of the simulation test. This achieves the effect of improving the accuracy of the mechanical simulation results of plastic alloy pipes and accurately assessing whether the plastic alloy pipe meets the usage requirements of specific working conditions.

[0091] Figure 2A flowchart illustrating a stress simulation analysis method for plastic alloy pipes provided in this application embodiment. Figure 2 .like Figure 2 As shown, in this embodiment... Figure 1 Based on the examples, the stress simulation analysis method for plastic alloy pipes is described in detail. The method includes:

[0092] S201. Obtain the basic property parameters of the plastic alloy pipe. The plastic alloy pipe includes the plastic alloy pipe and the metal joint. The plastic alloy pipe contains multiple fiber layups. The basic property parameters include: structural parameters, dimensional parameters and mechanical characteristic parameters.

[0093] By obtaining structural parameters, the established 3D model is made more closely resemble the actual situation, increasing the modeling accuracy of the plastic alloy pipe. Dimensional parameters include the pipe diameter and thickness, and the size of the metal fittings.

[0094] Optionally, the basic parameters of the plastic alloy tube can be obtained by analyzing and measuring a sample of the plastic alloy tube.

[0095] Samples of the plastic alloy pipe were obtained, and their microstructure was observed and measured to obtain the dimensional and structural parameters of the plastic alloy pipe, as well as the dimensional parameters of the metal fittings. Mechanical property tests were performed on the plastic alloy pipe to obtain its mechanical characteristic parameters; mechanical property tests were also performed on the metal fittings to obtain the mechanical characteristic parameters of the plastic alloy pipe. The mechanical property tests included circumferential and axial tensile tests.

[0096] S202. Based on the dimensional parameters of the plastic alloy pipe, construct a three-dimensional model of the plastic alloy pipe; and based on the dimensional parameters of the metal joint, construct a three-dimensional model of the metal joint.

[0097] The three-dimensional model of the plastic alloy pipe is a digital model created by computer that realistically reflects the shape, size and other characteristics of the plastic alloy pipe.

[0098] Choose appropriate 3D modeling software to model the plastic alloy pipe. Based on the obtained dimensional parameters, draw the outline of the plastic alloy pipe, match it with the actual pipe dimensions, and obtain the 3D model of the plastic alloy pipe. For example, Figure 3 This is a schematic diagram of a three-dimensional model of a metal joint provided in an embodiment of this application. Figure 3 As shown, the 3D model of the metal joint, modeled based on dimensional parameters, can represent the shape and size of the metal joint. Accurately representing the overall length, inner and outer diameters, and threads of the metal joint improves the accuracy of mechanical simulation experiments.

[0099] In addition, based on the dimensional parameters of the metal joint, a model is constructed to obtain the corresponding three-dimensional model of the metal joint.

[0100] Figure 4 This is a schematic diagram of a three-dimensional model of a plastic alloy pipe provided in an embodiment of this application. Figure 4 As shown, the 3D model of the plastic alloy pipe modeled according to the dimensional parameters can accurately represent the shape, diameter and wall thickness of the plastic and metal pipes, enabling the 3D model of the plastic alloy pipe and the 3D model of the metal joint to be assembled and connected, thus improving the accuracy of mechanical simulation tests.

[0101] S203. Based on the three-dimensional model of the plastic alloy pipe and the three-dimensional model of the metal joint, the plastic alloy pipe and the metal joint are assembled and connected according to the positional relationship of the application to obtain the three-dimensional model of the plastic alloy pipe.

[0102] Based on actual application scenarios, the connection methods and positional relationships between plastic alloy pipes and metal fittings are analyzed. The 3D models of the plastic alloy pipes and metal fittings are moved to the correct positions, aligned, and connected, ensuring a tight fit between their connection surfaces and the correct connection direction. This completes the assembly connection, resulting in the 3D model of the plastic alloy pipe.

[0103] S204. Based on the three-dimensional model, determine the fiber direction of each fiber layup according to the main axis direction of the plastic alloy pipe.

[0104] The angle of fiber layup in plastic alloy pipes can improve compressive strength, flexural strength, or torsional strength, affecting the overall mechanical properties of the pipe. In the 3D model, the direction parallel to the pipe is defined as the principal axis. Based on the structural parameters of the plastic alloy pipe, the type of layup, fiber layup angle, and number of fiber layers are determined.

[0105] Figure 5 Schematic diagram of fiber layup of plastic alloy tube provided in the embodiments of this application Figure 1 . Figure 6 Schematic diagram of fiber layup of plastic alloy tube provided in the embodiments of this application Figure 2 .like Figure 5 and Figure 6 As shown, the fiber orientation differs in different fiber layers within the plastic alloy pipe. Therefore, it is necessary to determine the fiber orientation in each fiber layer. Specifically:

[0106] In each fiber layer, the fiber orientation is determined based on the fiber layup angle and the main axis direction, thus defining the fiber orientation of each fiber layup in the fiber-plastic alloy tube. The fiber orientation can be parallel to the main axis direction (longitudinal fibers), perpendicular to it (circumferential fibers), or inclined at a certain angle (oblique fibers).

[0107] S205. Based on the fiber orientation of each fiber layup, and according to the structural parameters of the plastic alloy pipe, set the material properties for the fiber layup.

[0108] The type and thickness of fibers can affect the overall performance of plastic alloy pipes. For example, certain fibers (such as glass fiber) have better chemical and corrosion resistance, which can improve the service life of plastic alloy pipes in harsh environments; thicker fiber layers can provide higher strength and stiffness; different fibers have different coefficients of thermal expansion, and appropriate fiber combinations can adjust the thermal expansion characteristics of plastic alloy pipes, reducing dimensional changes caused by temperature variations. The thickness and type of each fiber layer are determined based on structural parameters. For each fiber in the layup, the corresponding material properties are set according to the fiber type and fiber layer thickness. The fiber type in each layup determines the basic mechanical properties of the layup, such as tensile strength, modulus, and thermal stability. The fiber layer thickness affects the overall stiffness and weight of the pipe, as well as its durability and fatigue life under different stress conditions. Therefore, the fiber layer thickness and fiber type must be precise to ensure that the plastic alloy pipe fully meets the actual performance requirements.

[0109] S206. Set the mechanical characteristics of different fiber layups according to the mechanical characteristic parameters.

[0110] Based on the mechanical characteristic parameters, corresponding mechanical characteristics are set for different fiber layers of the plastic alloy pipe in the three-dimensional model, so that the plastic alloy pipe in the three-dimensional model has mechanical characteristics that reflect actual performance.

[0111] Furthermore, by constructing the mechanical characteristics of the metal joint, an enhanced 3D model is obtained. Specifically, based on the mechanical characteristics of the metal joint, the mechanical characteristics of the metal joint in the 3D model are set to obtain the enhanced 3D model.

[0112] S207. Using shell element - SHELL281 element, the enhanced 3D model is meshed, and the mesh is refined at the contact area between the plastic alloy pipe and the metal joint to obtain a 3D mesh model.

[0113] The SHELL281 shell element is a high-order shell element with 8 nodes, each containing 6 degrees of freedom, including translation in three directions and rotation in three directions. The SHELL281 shell element can accurately simulate the complex deformation and stress conditions of shells.

[0114] Shell elements (SHELL281) were used to mesh the plastic alloy pipes in the enhanced 3D model. By setting parameters such as mesh size and ratio, the accuracy and stability of the mesh generation were ensured. Furthermore, mesh refinement was performed in stress concentration areas or areas with complex flow patterns to further improve the accuracy of the mechanical simulation results. Since stress concentration is prone to occur at the connection between the plastic alloy pipes and metal joints, the mesh was refined at this contact point to ensure more accurate simulation results.

[0115] Figure 7 This is a schematic diagram of a three-dimensional mesh model structure provided in an embodiment of this application. Figure 7 As shown, in the enhanced 3D mesh model, different mesh sizes are used to divide the plastic alloy pipe at different parts, focusing on the stress changes at stress concentration points to improve the accuracy of mechanical simulation; at the same time, attention to other parts is reduced to reduce computational complexity.

[0116] S208. Based on a three-dimensional mesh model, the composite material homogenization Halpin-Tsai model method is used to simulate the reinforcing layer in order to simulate the corresponding performance parameters of the reinforcing layer; among which, the performance parameters include the coefficient of thermal expansion, elastic modulus, Poisson's ratio and anisotropy.

[0117] The execution process of this step is the same as that described in step S104, and will not be repeated here.

[0118] S209. Treat the external load of the buried pipeline as a uniformly distributed constant load, establish reference points at the center of the two ends of the plastic alloy pipeline as the load application positions, and couple the pipeline end points to the end nodes of the metal joints.

[0119] In oil and gas fields, plastic alloy pipes are typically used as buried pipelines, bearing various external loads such as soil pressure loads. Simplifying complex external loads into uniformly distributed constant loads helps maintain the reasonableness of the results and reduces computational complexity.

[0120] Reference points are created at the centers of the two endpoints of the plastic alloy pipe. A uniformly distributed constant load is applied to the plastic alloy pipe through these reference points. The end nodes of the plastic alloy pipe in the 3D mesh model are coupled to the end nodes of the metal joint to ensure that the plastic alloy pipe and the metal joint deform together under load, thus accurately simulating the actual situation. The type of coupling can be determined according to actual needs, and includes rigid coupling and elastic coupling. Rigid coupling means that the relative displacement between the coupled nodes is zero; elastic coupling allows for a certain relative displacement between the coupled nodes.

[0121] S210. Based on actual operating conditions, a uniform internal pressure load is applied inside the plastic alloy pipe, and a tensile load is applied to both ends of the plastic alloy pipe to simulate the axial expansion deformation of the pipe section in the pipeline under internal pressure.

[0122] In actual operation, plastic alloy pipes are also subjected to internal pressure loads. Considering the force exerted by these internal pressure loads on the pipes, a uniform internal pressure load is applied inside the pipe. Simultaneously, tensile loads are applied to reference points at the centers of the two ends of the plastic alloy pipe to simulate the deformation of the pipe segment under internal and external pressure.

[0123] Optionally, a uniform internal pressure load of 16 MPa is applied inside the plastic alloy pipe; if the buried depth of the plastic alloy pipe is 1.8 m, equivalently, a pressure of 4.5 × 10⁻⁶ MPa is applied in the direction perpendicular to the pipe axis. 4 The tensile load is Pa, at which point gravity is perpendicular to the axis of the plastic alloy tube.

[0124] S211. Based on the performance parameters corresponding to the reinforcing layer, conduct mechanical simulation experiments to obtain the mechanical simulation results of the plastic alloy pipe.

[0125] Based on the performance parameters corresponding to the reinforcement layer obtained from the simulation, mechanical simulation experiments were conducted to obtain the mechanical simulation results of the plastic alloy pipe under actual operating conditions. The mechanical simulation results were then compared and analyzed with the actual pipeline conditions in oil and gas fields to verify the effectiveness of the mechanical simulation results.

[0126] Furthermore, by sampling pipelines from the same batch that are in service in oil and gas fields, mechanical property tests were conducted on the samples to obtain their tensile strength and verify the accuracy of the mechanical simulation results.

[0127] In one possible implementation, the mechanical simulation results of the plastic alloy pipe are obtained by using the solver built into the finite element software and conducting mechanical simulation experiments based on the performance parameters corresponding to the reinforcement layer.

[0128] Finite element software is a computer program developed based on the finite element method. The finite element method is a numerical analysis method that discretizes a complex continuum into a finite number of elements (i.e., finite elements), and obtains an approximate solution for the entire system by solving for the unknowns of these elements and nodes.

[0129] Specifically, using the solver built into the finite element software, mechanical simulation experiments are conducted based on the performance parameters corresponding to the reinforcement layer obtained from the simulation, to obtain the mechanical simulation results of the plastic alloy pipe under working conditions.

[0130] In one possible implementation, the mechanical simulation results include predicted stress distribution results. Correspondingly, the stress simulation analysis method for plastic alloy pipes further includes: if the mechanical simulation results indicate that the plastic alloy pipe does not meet the usage requirements under specific operating conditions, then the structural parameters of the plastic alloy pipe are adjusted based on the mechanical simulation results to optimize the plastic alloy pipe. The predicted stress distribution results represent the stress state of the plastic alloy pipe under external force. Stress cloud maps can be generated from the stress distribution results, which visualize the stress state and intuitively represent the stress state of the plastic alloy pipe. By analyzing the predicted stress distribution results, it is possible to effectively assess whether the plastic alloy pipe meets the usage requirements under specific operating conditions, avoid stress concentration, and reduce the risk of plastic alloy pipe joint failure.

[0131] Figure 8 A schematic diagram of mechanical simulation results provided for an embodiment of this application. For example... Figure 8 As shown, colors represent the stress levels at corresponding locations. At the contact point between the plastic alloy pipe and the metal joint, the color is red, indicating a high stress concentration and a risk of joint failure. The middle section of the plastic alloy pipe is yellow, indicating that the stress is within the pipe's tolerance range and there is no risk of breakage.

[0132] If the results of mechanical simulation indicate that the plastic alloy pipe does not meet the usage requirements under specific working conditions, the structural parameters of the plastic alloy pipe should be adjusted, including adjusting parameters such as fiber layer angle, layup thickness, adhesive layer thickness, fiber layer type, and adhesive layer type, so that the adjusted and optimized plastic alloy pipe meets the usage requirements under specific working conditions.

[0133] The stress simulation analysis method for plastic alloy pipes provided in this application involves establishing accurate three-dimensional models of the plastic alloy pipe and metal joints, and assembling and connecting these models to obtain a three-dimensional model of the plastic alloy pipe. Based on the structural and mechanical parameters of the plastic alloy pipe, the corresponding fiber orientation and mechanical characteristics in the three-dimensional model are set to obtain a reinforced three-dimensional model. This reinforced three-dimensional model more closely resembles the actual pipe, helping to improve the accuracy of the mechanical simulation test results. Shell elements (SHELL281) are used to mesh the reinforced three-dimensional model, and mesh refinement is applied at stress concentration points to obtain a three-dimensional mesh model. Mesh refinement at stress concentration points allows for detailed prediction of stress changes at these locations. The composite material homogenization Halpin-Tsai model method is used to treat different fiber layers in the plastic alloy pipe as a structure formed by the interlacing of orthogonal anisotropic homogeneous materials, considering the interactions between different fiber layers and examining the force action in the reinforcing layer from a macroscopic perspective. By applying loads and boundary conditions to the three-dimensional mesh model, mechanical simulation experiments are conducted to obtain the mechanical simulation results of the plastic alloy pipe. This method enables effective prediction of stress in plastic alloy pipes, improves the accuracy of mechanical simulation results for plastic alloy pipes, and effectively evaluates whether plastic alloy pipes meet the usage requirements under specific working conditions.

[0134] Figure 9 A flowchart illustrating a stress simulation analysis method for plastic alloy pipes provided in this application embodiment. Figure 3 .like Figure 9 As shown, in this embodiment... Figure 1 Based on the examples, the stress simulation analysis method for plastic alloy pipes is described in detail. The method includes:

[0135] S901. Obtain the basic property parameters of the plastic alloy pipe.

[0136] Samples of the plastic alloy pipes were taken and their mechanical properties were tested to obtain the basic property parameters of the plastic alloy pipes and metal joints.

[0137] Optionally, samples of plastic alloy pipes (fiber-reinforced composite materials) used in oil and gas fields are taken, and mechanical property tests are performed on the samples to obtain the basic property parameters of the fiber-reinforced composite materials.

[0138] S902. Construct a two-dimensional model of a fiber-reinforced composite material pipe.

[0139] Based on the basic property parameters of fiber-reinforced composite materials, a two-dimensional model of fiber-reinforced composite material pipes is constructed.

[0140] Specifically, based on the basic property parameters of fiber-reinforced composite materials, such as the layup angle, layup thickness, adhesive layer thickness, fiber layer type, and adhesive layer type, a two-dimensional model of the fiber-reinforced composite material pipeline is created in finite element software.

[0141] S903. Define the main directions of each layer in the two-dimensional model of the fiber-reinforced composite pipe.

[0142] Define the reference direction for each layer in the fiber-reinforced composite pipe, and based on the defined reference direction, define the principal direction for each layer in the fiber-reinforced composite pipe.

[0143] S904. Construct a three-dimensional model of a fiber-reinforced composite material pipe.

[0144] The corresponding solid model of the multilayer fiber-reinforced composite pipe was generated using finite element software.

[0145] Specifically, based on the main orientation of each layer in the fiber-reinforced composite pipe and the two-dimensional model of the fiber-reinforced composite pipe, a corresponding three-dimensional model of the fiber-reinforced composite pipe is constructed. The three-dimensional model of the fiber-reinforced composite pipe can represent the solid model of a multi-layer fiber-reinforced composite pipe.

[0146] S905. Construct a three-dimensional model of the metal joint.

[0147] A three-dimensional model of the metal joint is constructed using modeling software and the basic property parameters of the metal joint.

[0148] Specifically, a three-dimensional model of the metal joint is constructed using computer-aided design (CAD) software combined with the basic property parameters of the metal joint. The three-dimensional model of the metal joint constructed in CAD is then converted into a format that can be imported into the finite element analysis software, and imported into the finite element analysis software.

[0149] S906, 3D model of fiber reinforced composite pipe and 3D model of metal joint assembly connection.

[0150] Based on the actual working positions on site, the 3D model of the fiber-reinforced composite pipe and the 3D model of the metal joint are assembled and connected.

[0151] S907, Grid generation.

[0152] The 3D model of the fiber-reinforced composite pipe was meshed using SHELL281 elements. Simultaneously, the composite material homogenization Halpin-Tsai model method was employed to simulate the reinforcing layer of the fiber-reinforced composite pipe, treating the entire reinforcing layer as an orthogonal anisotropic homogeneous material interwoven with resin adhesive layers between the layers.

[0153] Furthermore, since stress concentration is prone to occur at the connection between the fiber-reinforced composite pipe and the metal joint, the mesh of the contact area between the 3D model of the fiber-reinforced composite pipe and the 3D model of the metal joint is refined during mesh generation to improve the accuracy of the simulation results.

[0154] S908. Determine the loads and boundary conditions.

[0155] Based on actual oil and gas field operating conditions, actual loads and boundary conditions are obtained. These are then simplified to obtain the final loads and boundary conditions. The corresponding loads and boundary conditions are set in the finite element software. Reference points are established at the centers of the two ends of the 3D model of the fiber-reinforced composite pipe, and the endpoints of the 3D model are coupled to the end nodes of the 3D model of the metal joint. According to actual operating conditions, a uniform internal pressure load is applied inside the fiber-reinforced composite pipe, and tensile loads are applied to both ends of the pipe.

[0156] S909, Mechanical Simulation Test.

[0157] Simulation calculations were performed using the internal solver of finite element software, and the corresponding simulation results were output. The simulation results were then compared and analyzed with actual pipeline conditions in oil and gas fields to verify the accuracy of the simulation results.

[0158] This application embodiment acquires basic property data of fiber-reinforced composite materials, creates a two-dimensional model of the fiber-reinforced composite pipeline, and defines the reference and principal directions of each layer to accurately simulate the material's behavior under stress, thereby improving the accuracy of the simulation test. Mesh refinement is applied at the connection points between the fiber-reinforced composite pipeline and the metal joint to reduce the impact of stress concentration on the simulation test results and improve the accuracy of the simulation analysis. Simulation calculations are performed using the internal solver of finite element software, and the corresponding simulation test results are output. These results are then compared and analyzed with actual pipeline conditions in oil and gas fields to verify the accuracy and reliability of the simulation results. This achieves the effect of accurately evaluating the performance of fiber-reinforced composite pipelines under specific working conditions.

[0159] Figure 10 This is a schematic diagram of the structure of the stress simulation and analysis device for plastic alloy pipes provided in the embodiments of this application, as shown below. Figure 10 As shown, the stress simulation and analysis device 100 for plastic alloy pipes provided in this embodiment includes:

[0160] The acquisition module 1001 is used to acquire a three-dimensional model of a plastic alloy pipe. The plastic alloy pipe includes a plastic alloy pipe and a metal joint. The plastic alloy pipe includes multiple fiber lay-ups, with resin bonding layers set between the layers.

[0161] The processing module 1002 is used to construct the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe based on the three-dimensional model and the structural and mechanical characteristic parameters of the plastic alloy pipe, as well as to construct the mechanical characteristics of the metal joint, to obtain an enhanced three-dimensional model; and to perform mesh generation on the enhanced three-dimensional model to obtain a three-dimensional mesh model.

[0162] Simulation module 1003 is used to simulate the reinforcing layer based on a three-dimensional mesh model using the composite material homogenization Halpin-Tsai model method, in order to simulate the performance parameters corresponding to the reinforcing layer. Among them, the performance parameters include the coefficient of thermal expansion, elastic modulus, Poisson's ratio, and anisotropy. Based on the performance parameters corresponding to the reinforcing layer and the set loads and boundary conditions, mechanical simulation tests are performed to obtain the mechanical simulation results of the plastic alloy pipe.

[0163] In one possible implementation, the processing module 1002 is specifically used to: determine the fiber direction of each fiber layup based on the three-dimensional model and the main axis direction of the plastic alloy pipe; and set material properties for the fiber layup based on the fiber direction of each fiber layup and the structural parameters of the plastic alloy pipe.

[0164] Based on the mechanical characteristic parameters, the mechanical characteristics of different fiber layups are set.

[0165] In one possible implementation, the processing module 1002 is further configured to: use shell elements - SHELL281 elements to mesh the enhanced 3D model, and refine the mesh at the contact points between the plastic alloy pipe and the metal joint to obtain a 3D mesh model.

[0166] In one possible implementation, the simulation module 1003 is specifically used to: process the external load of the buried pipeline as a uniformly distributed constant load, establish reference points at the center of the two ends of the plastic alloy pipeline as the load application positions, and couple the pipeline end points with the end nodes of the metal joints; according to the actual operating conditions, set and apply a uniform internal pressure load inside the plastic alloy pipeline, and apply tensile loads to the two ends of the plastic alloy pipeline to simulate the axial expansion deformation of the pipe section in the pipeline under internal pressure; and conduct mechanical simulation tests based on the performance parameters corresponding to the reinforcing layer to obtain the mechanical simulation results of the plastic alloy pipe.

[0167] In one possible implementation, the simulation module 1003 is also used to: use the solver built into the finite element software to conduct mechanical simulation tests based on the performance parameters corresponding to the reinforcement layer, and obtain the mechanical simulation results of the plastic alloy pipe.

[0168] In one possible implementation, the acquisition module 1001 is specifically used to: acquire basic property parameters of the plastic alloy pipe, which includes a plastic alloy conduit and a metal connector, wherein the plastic alloy conduit contains multiple fiber layups, and the basic property parameters include: structural parameters, dimensional parameters, and mechanical characteristic parameters; construct a three-dimensional model of the plastic alloy conduit based on the dimensional parameters of the plastic alloy conduit, and construct a three-dimensional model of the metal connector based on the dimensional parameters of the metal connector; and assemble and connect the plastic alloy conduit and the metal connector according to the positional relationship of the application based on the three-dimensional model of the plastic alloy conduit and the three-dimensional model of the metal connector to obtain a three-dimensional model of the plastic alloy conduit.

[0169] In one possible implementation, the mechanical simulation results include predicted stress distribution results. Correspondingly, the plastic alloy pipe stress simulation analysis device 100 further includes an optimization module (not shown), used to optimize the plastic alloy pipe by adjusting its structural parameters based on the mechanical simulation results when the plastic alloy pipe is assessed to not meet the usage requirements under specific working conditions.

[0170] The stress simulation and analysis device for plastic alloy pipes provided in this application embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0171] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 11 As shown, the electronic device 11 provided in this embodiment includes at least one processor 1101 and a memory 1102. Optionally, the device 11 further includes a communication component 1103. The processor 1101, the memory 1102, and the communication component 1103 are connected via a bus 1104.

[0172] In a specific implementation, at least one processor 1101 executes computer execution instructions stored in memory 1102, causing at least one processor 1101 to perform the above-described method.

[0173] The specific implementation process of processor 1101 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0174] 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.

[0175] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0176] 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 of this application are not limited to a single bus or a single type of bus.

[0177] This application also provides a computer program product, including a computer program that, when executed by a processor or other device or component, implements the above-described method.

[0178] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed, implement any of the methods described above.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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 (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0185] 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.

[0186] 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 stress simulation analysis of plastic alloy pipes, characterized in that, include: A three-dimensional model of a plastic alloy pipe is obtained. The plastic alloy pipe includes a plastic alloy pipe and a metal joint. The plastic alloy pipe includes multiple fiber lay-ups with resin bonding layers between the layers. Based on the three-dimensional model, according to the structural and mechanical parameters of the plastic alloy pipe, the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe are constructed, as well as the mechanical characteristics of the metal joint are constructed, to obtain an enhanced three-dimensional model; The enhanced 3D model is meshed to obtain a 3D mesh model; Based on the aforementioned three-dimensional mesh model, the composite material homogenization Halpin-Tsai model method is used to simulate the reinforcing layer in order to simulate the corresponding performance parameters of the reinforcing layer; wherein, the performance parameters include the coefficient of thermal expansion, elastic modulus, Poisson's ratio, and anisotropy; Based on the performance parameters corresponding to the reinforcing layer and the set load and boundary conditions, mechanical simulation tests were conducted to obtain the mechanical simulation results of the plastic alloy pipe.

2. The method according to claim 1, characterized in that, Based on the three-dimensional model, and according to the structural and mechanical parameters of the plastic alloy pipe, the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe are constructed, including: Based on the three-dimensional model, the fiber orientation of each fiber layup is determined according to the main axis direction of the plastic alloy pipe. Based on the fiber orientation of each fiber layup, and according to the structural parameters of the plastic alloy pipe, material properties are set for the fiber layup. Based on the aforementioned mechanical characteristic parameters, the mechanical characteristics of different fiber layups are set.

3. The method according to claim 1 or 2, characterized in that, The step of meshing the enhanced 3D model to obtain a 3D mesh model includes: The enhanced 3D model was meshed using shell elements (SHELL281 elements), and the mesh was refined at the contact points between the plastic alloy pipe and the metal joint to obtain a 3D mesh model.

4. The method according to claim 1 or 2, characterized in that, The mechanical simulation test is conducted based on the performance parameters corresponding to the reinforcing layer and the set load and boundary conditions to obtain the mechanical simulation results of the plastic alloy pipe, including: The external load on the buried pipeline is treated as a uniformly distributed constant load. Reference points are established at the center of the two ends of the plastic alloy pipeline as the load application positions, and the pipeline end points are coupled to the end nodes of the metal joints. Based on actual operating conditions, a uniform internal pressure load is applied inside the plastic alloy pipe, and a tensile load is applied to both ends of the plastic alloy pipe to simulate the axial expansion deformation of the pipe section in the pipeline under internal pressure. Based on the performance parameters corresponding to the reinforcing layer, mechanical simulation experiments were conducted to obtain the mechanical simulation results of the plastic alloy pipe.

5. The method according to claim 4, characterized in that, The mechanical simulation test based on the performance parameters corresponding to the reinforcing layer, to obtain the mechanical simulation results of the plastic alloy pipe, includes: Using the solver built into the finite element method software, mechanical simulation experiments were conducted based on the performance parameters corresponding to the reinforcing layer to obtain the mechanical simulation results of the plastic alloy pipe.

6. The method according to claim 1 or 2, characterized in that, The process of obtaining the three-dimensional model of the plastic alloy pipe includes: Obtain the basic property parameters of the plastic alloy pipe, including: structural parameters, dimensional parameters and mechanical characteristic parameters; Based on the dimensional parameters of the plastic alloy pipe, a three-dimensional model of the plastic alloy pipe is constructed; and based on the dimensional parameters of the metal joint, a three-dimensional model of the metal joint is constructed. Based on the three-dimensional model of the plastic alloy pipe and the three-dimensional model of the metal joint, the plastic alloy pipe and the metal joint are assembled and connected according to the positional relationship of the application to obtain the three-dimensional model of the plastic alloy pipe.

7. The method according to claim 1 or 2, characterized in that, The mechanical simulation results include predicted stress distribution results, and also include: If the results of mechanical simulation determine that the plastic alloy pipe does not meet the usage requirements under specific working conditions, then the structural parameters of the plastic alloy pipe are adjusted and optimized based on the mechanical simulation results.

8. A stress simulation and analysis device for plastic alloy pipes, characterized in that, include: The acquisition module is used to acquire a three-dimensional model of a plastic alloy pipe, which includes a plastic alloy pipe and a metal joint. The plastic alloy pipe includes multiple fiber lay-ups with resin bonding layers between the layers. The processing module is used to construct the material properties and mechanical characteristics of different fiber layups in the plastic alloy pipe based on the three-dimensional model and according to the structural parameters and mechanical characteristic parameters of the plastic alloy pipe, as well as to construct the mechanical characteristics of the metal joint, to obtain an enhanced three-dimensional model; and to perform mesh generation on the enhanced three-dimensional model to obtain a three-dimensional mesh model. The simulation module is used to simulate the reinforcing layer based on the three-dimensional mesh model using the composite material homogenization Halpin-Tsai model method, so as to simulate the performance parameters corresponding to the reinforcing layer; wherein, the performance parameters include the coefficient of thermal expansion, elastic modulus, Poisson's ratio and anisotropy; Furthermore, based on the performance parameters corresponding to the reinforcing layer and the set load and boundary conditions, mechanical simulation tests are conducted to obtain the mechanical simulation results of the plastic alloy pipe.

9. 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 1-7.

10. 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 1-7.

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