A method, device, medium and product for determining self-reinforced pressure of an ultra-high pressure container barrel structure

Abstract

The application discloses a self-reinforcing pressure determination method, device, medium and product of an ultrahigh-pressure container cylinder structure, relates to the field of performance testing, and comprises the following steps: obtaining stress-strain curves and yield strengths of an ultrahigh-pressure container cylinder material at different radius positions; establishing an ultrahigh-pressure container cylinder self-reinforcing pressure calculation numerical model according to structure size parameters of the ultrahigh-pressure container cylinder; determining a self-reinforcing pressure range according to the inner diameter and the outer diameter of the ultrahigh-pressure container cylinder and the yield strengths at the different radius positions; and determining a final self-reinforcing pressure by using a trial method to iteratively determine the final self-reinforcing pressure based on the ultrahigh-pressure container cylinder self-reinforcing pressure calculation numerical model between the self-reinforcing pressure range. The application can accurately determine the self-reinforcing pressure, and then accurately calculate residual strain values of the cylinder after a self-reinforcing process, so as to accurately determine whether the self-reinforcing effect meets the requirements.

Description

Technical Field

[0001] This application relates to the field of performance testing, and in particular to a method, equipment, medium, and product for determining the self-reinforcing pressure of an ultra-high pressure vessel shell structure. Background Technology

[0002] Ultra-high pressure vessels are widely used in various industrial fields, and their cylindrical structures need to withstand high-frequency alternating loads during service. To improve the fatigue life of ultra-high pressure vessel cylinders, a self-reinforcing process is commonly used in industry. The principle of the self-reinforcing process is as follows: an internal pressure exceeding the material's yield strength is applied to the inner wall of the cylinder, causing plastic deformation in the inner layer while the outer layer maintains elastic deformation. When the internal pressure is removed, beneficial residual compressive stress is generated on the inner wall of the cylinder due to the constraint of the elastic recovery of the outer layer. This residual compressive stress can effectively offset some of the tensile stress when the vessel subsequently withstands working pressure, reducing the equivalent stress amplitude of the inner wall, thereby significantly improving the fatigue life of the vessel. Therefore, accurately determining the self-reinforcing pressure is crucial for the successful implementation of the self-reinforcing process and achieving the expected results.

[0003] Currently, in determining the self-reinforcing pressure of ultra-high pressure vessel shells, the industry typically uses the material performance standard values ​​(such as standard yield strength) in the corresponding national or industry standards as material performance parameters, and calculates and determines the self-reinforcing pressure through theoretical formulas or simplified models.

[0004] However, the existing self-reinforcing pressure determination methods have the following drawbacks in practical applications: (1) Existing methods usually use standard values ​​directly for calculation, without considering the objective deviation between the actual performance of the material and the standard value during the smelting, forging and other manufacturing processes, resulting in inaccurate basic data for calculation. (2) Existing methods usually assume that the properties of the cylinder material are uniformly distributed, without fully considering that the ultra-high pressure vessel cylinder will exhibit obvious non-uniformity in the radial direction of the material properties during the manufacturing process (especially the heat treatment process).

[0005] Based on the above problems, there is an urgent need to provide a method that can accurately determine self-reinforcing pressure. Summary of the Invention

[0006] The purpose of this application is to provide a method, equipment, medium, and product for determining the self-reinforcing pressure of an ultra-high pressure vessel shell structure, which can accurately determine the self-reinforcing pressure and then accurately calculate the residual strain value of the shell after the self-reinforcing process, so as to accurately determine whether the self-reinforcing effect meets the requirements.

[0007] To achieve the above objectives, this application provides the following solution: In a first aspect, this application provides a method for determining the self-reinforcing pressure of an ultra-high pressure vessel shell structure, including: Obtain the stress-strain curves and yield strength of the ultra-high pressure vessel shell material at different radius positions; Based on the structural dimensional parameters of the ultra-high pressure vessel cylinder, a numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder is established; the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder includes a geometric model composed of multiple concentric cylinders, and the material property parameters of each concentric cylinder are set according to the stress-strain curve; The self-reinforcing pressure range is determined based on the inner and outer diameters of the ultra-high pressure vessel cylinder and the yield strength at different radius positions; Within the range of self-reinforcing pressure, the final self-reinforcing pressure is determined iteratively using a trial-and-error method based on a numerical model for calculating the self-reinforcing pressure of an ultra-high pressure vessel cylinder. The iterative process of the trial algorithm includes: Select the initial value of the self-reinforcing pressure; Based on the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder, the residual strain value and the radius value of the elastoplastic interface on the inner surface of the cylinder after loading the initial value of the self-reinforcing pressure and unloading are calculated. If the residual strain value is less than the preset residual strain threshold, then it is determined whether the radius value of the elastoplastic interface meets the requirements of the design document. If the radius of the elastoplastic interface meets the requirements of the design documents, calculate the stress distribution on the cylinder when the design pressure of the ultra-high pressure vessel is reloaded, determine the maximum value of the equivalent stress, and calculate the fatigue life according to the fatigue curve method of the ultra-high pressure vessel cylinder material to determine whether it meets the requirements of the design documents. If the fatigue life meets the design requirements, then the current initial value of the self-reinforcing pressure will be determined as the final self-reinforcing pressure. If any of the above-mentioned residual strain value, radius value of the elastoplastic interface, or fatigue life judgment does not meet the requirements, the self-reinforcing pressure is adjusted according to the self-reinforcing pressure range and recalculated until the final self-reinforcing pressure is determined.

[0008] Secondly, this application provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the self-reinforcing pressure determination method for the ultra-high pressure vessel cylinder structure.

[0009] Thirdly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the self-reinforcing pressure determination method for the ultra-high pressure vessel cylinder structure.

[0010] Fourthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the self-reinforcing pressure determination method for the ultra-high pressure vessel cylinder structure.

[0011] According to the specific embodiments provided in this application, this application has the following technical effects: This application provides a method, equipment, medium, and product for determining the self-reinforcing pressure of an ultra-high pressure vessel shell structure. When determining the self-reinforcing pressure, the measured performance data of the ultra-high pressure vessel material, namely the stress-strain curve and yield strength, are used. Within the range of the self-reinforcing pressure, based on a numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel shell, a trial-and-error algorithm is used to iteratively determine the final self-reinforcing pressure. This fully considers the non-uniformity of material properties in the radial direction caused by the manufacturing and heat treatment process of the ultra-high pressure vessel shell. When determining the self-reinforcing pressure, the residual strain value of the shell after the self-reinforcing process is calculated more accurately to accurately determine whether the self-reinforcing effect meets the requirements. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic flowchart of a self-reinforcing pressure determination method for an ultra-high pressure vessel cylinder structure according to an embodiment of this application. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] In one exemplary embodiment, such as Figure 1 As shown, a video tag processing method is provided, which includes the following steps S101 to S104. Wherein: S101, obtain the stress-strain curves and yield strength of the ultra-high pressure vessel shell material at different radius positions; S101 specifically includes: S11, Before machining the ultra-high pressure vessel shell, a thickness is cut from one end of the ultra-high pressure vessel shell. d t Material property test specimens that meet the requirements for preparing tensile specimens; S12, tensile specimens are prepared at different radii along the same radial direction of the material performance test specimen, wherein the different radii include at least the inner diameter position and the outer diameter position of the ultra-high pressure vessel cylinder; Specifically, according to the requirements of GB / T 228.1 "Metallic materials, tensile testing—Part 1: Test at room temperature," different radii... r 1. r 2. r 3…… r n-1 , r n Tensile specimens were prepared at the site, wherein... r 1 is the inner diameter of the cylinder. r n The outer diameter of the cylinder. r 2. r 3…… r n-1 Take a value between the inner diameter of the cylinder and the outer diameter of the cylinder, and the sum of the values. n The diameter can be adjusted according to the inner and outer diameters of the cylinder; the radius is adjusted according to GB / T228.1. r 1. r 2. r 3…… r n-1 , r n Tensile test on the tensile specimen at the location S13, Perform a tensile test on the tensile specimen to measure the ultra-high pressure vessel cylinder material at various radial positions. r 1. r 2. r 3…… r n-1 , r n Yield strength at () R e1 , R e2 , R e3 ... R e(n-1) , R en ) and stress-strain curves.

[0017] S102, Based on the structural dimension parameters of the ultra-high pressure vessel cylinder, establish a numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder; the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder includes a geometric model composed of multiple layers of concentric cylinders, and the material property parameters of each layer of concentric cylinders are set according to the stress-strain curve. The number of concentric cylinders is n-1; n is the number of different radius positions; the thickness of each concentric cylinder layer is determined according to the difference between two adjacent radius positions, that is, the thickness of each layer is respectively... r 2- r 1. r 3- r 2…… r n - r n-1 The material performance parameters of each layer of the cylinder are based on the cylinder material at the radius. r 1. r 2. r 3…… r n-1 , r n The measured stress-strain curves were set.

[0018] S103, the self-reinforcing pressure range is determined based on the inner and outer diameters of the ultra-high pressure vessel cylinder and the yield strength at different radius positions; S103 specifically includes: Using formula Determine the lower limit of the self-reinforcing pressure range ; Using formula Determine the upper limit of the self-reinforcing pressure range ; in, The inner diameter of the ultra-high pressure vessel shell. Yield strength at the point, This refers to the outer diameter of the ultra-high pressure vessel shell. The radius of the ultra-high pressure vessel shell. Yield strength at the point, It represents the radius position of the (i+1)th ultra-high pressure vessel cylinder.

[0019] S104, within the range of self-reinforcing pressure, based on the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder, the final self-reinforcing pressure is determined iteratively using a trial-and-error method. The iterative process of the trial algorithm includes: S1, Select the initial value of the self-reinforcing pressure. p a0 ; S2, Based on the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder, calculate the initial value of the self-reinforcing pressure. p a0 And the residual strain value on the inner surface of the cylinder and the radius of the elastoplastic interface after unloading. r p The elastoplastic interface is an interface with zero stress. S3, if the residual strain value e m If the residual strain is less than the preset residual strain threshold, then it is determined whether the radius of the elastoplastic interface meets the design requirements; the preset residual strain threshold is 2%; that is, the residual strain value on the inner surface of the cylinder. e m If the residual strain value on the inner surface of the cylinder is less than 2%, proceed to S4); e m If the value exceeds 2%, then S1; reduce the self-reinforcing pressure value and reselect the self-reinforcing pressure value. p a1 ， Recalculate and load p a1 Residual strain value on the inner surface of the cylinder after internal pressure and unloading e m1 and the radius value of the elastoplastic interface r p1 Until the residual strain value on the inner surface of the cylinder. e m If the value is less than 2%, proceed to S4; S4. If the radius of the elastoplastic interface meets the requirements of the design documents, calculate the stress distribution on the cylinder when the design pressure of the ultra-high pressure vessel is reloaded, determine the maximum value of the equivalent stress, and calculate the fatigue life according to the fatigue curve method of the ultra-high pressure vessel cylinder material to determine whether it meets the requirements of the design documents; the equivalent stress is the Mises equivalent stress or the equivalent stress based on the third strength theory. S5. If the fatigue life meets the design document requirements, then the current initial value of the self-reinforcing pressure is determined as the final self-reinforcing pressure. S6. If any of the above-mentioned residual strain value, radius value of the elastoplastic interface, or fatigue life judgment does not meet the requirements, the self-reinforcing pressure is adjusted according to the self-reinforcing pressure range and recalculated until the final self-reinforcing pressure is determined.

[0020] As a specific embodiment, the residual strain value and the radius value of the elastoplastic interface on the inner surface of the cylinder after loading and unloading the internal pressure are calculated based on the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder, and are obtained by finite element analysis software.

[0021] This application uses the determined final self-reinforcing pressure value as the core process parameter and inputs it into the self-reinforcing processing equipment (such as the ultra-high pressure boosting device and control system) of the ultra-high pressure vessel.

[0022] Compared with the prior art, the self-reinforcing pressure determination method for an ultra-high pressure vessel cylinder structure provided in this application has the following significant advantages: (1) Significantly improved the calculation accuracy and reliability of self-reinforcing pressure determination. Existing technologies typically use standard material performance values ​​from national or industry standards for calculations, neglecting the objective deviation between actual material properties and standard values. This application, however, obtains the measured yield strength and stress-strain curves of the cylinder material at various radii by cutting specimens before cylinder machining and actually preparing tensile samples at different radii for tensile testing. Using measured data as the basis for calculations fundamentally eliminates calculation errors caused by the deviation between theoretical standard values ​​and actual material properties, significantly improving the accuracy and reliability of the calculation basis data.

[0023] (2) It accurately reflects the non-uniformity of material properties, making the numerical model closer to physical reality. During the manufacturing process (especially heat treatment), the material properties of ultra-high pressure vessel cylinders exhibit objective non-uniformity in the radial direction. Existing methods typically assume a uniform distribution of material properties, leading to computational distortion. This application divides the cylinder's geometric model into a structure composed of multiple layers (n-1 layers) of concentric cylinders based on measured values ​​at different radii, and assigns each layer a measured stress-strain curve at the corresponding radii. This layered modeling method fully considers and realistically reproduces the gradient changes in material properties in the radial direction, enabling the self-reinforcing pressure calculation numerical model to more accurately simulate the cylinder's true mechanical response during loading and unloading.

[0024] (3) Through multi-dimensional iterative verification, the optimization and safety of the self-enhancing process effect are ensured. This application abandons the single formula calculation and adopts a trial-and-error method that includes multi-dimensional judgment conditions. This method not only calculates the residual strain value on the inner surface of the cylinder after loading and unloading (e.g., controlling it to be less than 2%) and the radius of the elastoplastic interface, but also further calculates the maximum value of the Mises equivalent stress (or equivalent stress based on the third strength theory) when the design pressure is reloaded, and combines this with the material fatigue curve method to calculate fatigue life. Through this multi-parameter iterative calculation and closed-loop verification, it can be ensured that the finally determined self-reinforcing pressure can generate sufficient beneficial residual compressive stress to improve the load-bearing capacity, while avoiding damage to the inner wall or a reduction in fatigue life due to excessive self-reinforcing pressure. This accurately achieves the expected self-reinforcing effect and effectively guarantees the safe service life of the ultra-high pressure vessel.

[0025] In an exemplary embodiment, a computer device is provided, which may be a server or a terminal. The computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is connected to the system bus via the I / O interfaces. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The I / O interfaces of the computer device are used for exchanging information between the processor and external devices. The communication interface of the computer device is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a self-reinforcing pressure determination method for an ultra-high pressure vessel shell structure.

[0026] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0027] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0028] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0029] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0030] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0031] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0032] In this application, all actions to acquire signals, information, or data are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with the authorization granted by the owner of the relevant device.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for determining the self-reinforcing pressure of an ultra-high pressure vessel shell structure, characterized in that, include: Obtain the stress-strain curves and yield strength of the ultra-high pressure vessel shell material at different radius positions; Based on the structural dimensional parameters of the ultra-high pressure vessel cylinder, a numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder is established; the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder includes a geometric model composed of multiple concentric cylinders, and the material property parameters of each concentric cylinder are set according to the stress-strain curve; The self-reinforcing pressure range is determined based on the inner and outer diameters of the ultra-high pressure vessel cylinder and the yield strength at different radius positions; Within the range of self-reinforcing pressure, the final self-reinforcing pressure is determined iteratively using a trial-and-error method based on a numerical model for calculating the self-reinforcing pressure of an ultra-high pressure vessel cylinder. The iterative process of the trial algorithm includes: Select the initial value of the self-reinforcing pressure; Based on the numerical model for calculating the self-reinforcing pressure of the ultra-high pressure vessel cylinder, the residual strain value and the radius value of the elastoplastic interface on the inner surface of the cylinder after loading the initial value of the self-reinforcing pressure and unloading are calculated. If the residual strain value is less than the preset residual strain threshold, then it is determined whether the radius value of the elastoplastic interface meets the requirements of the design document. If the radius of the elastoplastic interface meets the requirements of the design documents, calculate the stress distribution on the cylinder when the design pressure of the ultra-high pressure vessel is reloaded, determine the maximum value of the equivalent stress, and calculate the fatigue life according to the fatigue curve method of the ultra-high pressure vessel cylinder material to determine whether it meets the requirements of the design documents. If the fatigue life meets the design requirements, then the current initial value of the self-reinforcing pressure will be determined as the final self-reinforcing pressure. If any of the residual strain value, the radius of the elastoplastic interface, or the fatigue life does not meet the requirements, the self-reinforcing pressure is adjusted according to the self-reinforcing pressure range and recalculated until the final self-reinforcing pressure is determined.

2. The method for determining the self-reinforcing pressure of the ultra-high pressure vessel cylinder structure according to claim 1, characterized in that, The acquisition of stress-strain curves and yield strength of the ultra-high pressure vessel shell material at different radii specifically includes: Before processing the ultra-high pressure vessel shell, a material property test specimen with a thickness that meets the requirements for preparing tensile test specimens is cut from one end of the ultra-high pressure vessel shell. Tensile specimens are prepared at different radii along the same radial direction of the material property test specimen, and the different radii include at least the inner diameter position and the outer diameter position of the ultra-high pressure vessel cylinder; Tensile tests were performed on the tensile specimens to measure the yield strength and stress-strain curves of the ultra-high pressure vessel shell material at various radii.

3. The method for determining the self-reinforcing pressure of the ultra-high pressure vessel cylinder structure according to claim 1, characterized in that, The number of concentric cylinders is n-1; n is the number of different radius positions; the thickness of each concentric cylinder is determined according to the difference between two adjacent radius positions.

4. The method for determining the self-reinforcing pressure of the ultra-high pressure vessel cylinder structure according to claim 3, characterized in that, The self-reinforcing pressure range is determined based on the inner and outer diameters of the ultra-high pressure vessel cylinder and the yield strength at different radii, specifically including: Using formula Determine the lower limit of the self-reinforcing pressure range ; Using formula Determine the upper limit of the self-reinforcing pressure range ; in, The inner diameter of the ultra-high pressure vessel cylinder. Yield strength at the point, This refers to the outer diameter of the ultra-high pressure vessel shell. The radius of the ultra-high pressure vessel shell. Yield strength at the point, It represents the radius position of the (i+1)th ultra-high pressure vessel cylinder.

5. The method for determining the self-reinforcing pressure of the ultra-high pressure vessel cylinder structure according to claim 1, characterized in that, The equivalent stress is either the Mises equivalent stress or the equivalent stress based on the third strength theory.

6. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the self-reinforcing pressure determination method for the ultra-high pressure vessel cylinder structure according to any one of claims 1-5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the self-reinforcing pressure determination method for the ultra-high pressure vessel cylinder structure as described in any one of claims 1-5.

8. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the self-reinforcing pressure determination method for the ultra-high pressure vessel cylinder structure as described in any one of claims 1-5.

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