CN-121980852-A - Rupture disk residual thickness design method based on test calibration and simulation calculation

CN121980852ACN 121980852 ACN121980852 ACN 121980852ACN-121980852-A

Abstract

The invention discloses a bursting disc residual thickness design method based on test calibration and simulation calculation, which comprises the steps of obtaining a real stress-strain curve of a bursting disc material, establishing a finite element simulation model of the bursting disc with scores according to the real stress-strain curve of the bursting disc material, simulating the finite element simulation model by applying load to obtain a pressure value corresponding to the bursting disc when the bursting disc is burst, recording the pressure value as simulated bursting pressure P sim , comparing the simulated bursting pressure P sim with target bursting pressure P target , and obtaining a design value of the bursting disc residual thickness according to a comparison result. The invention can obviously improve the design precision and the research and development efficiency of the residual thickness of the rupture disc scores, and has important guiding significance for the production and application of the rupture disc.

Inventors

XU JUN
WANG NING
FENG XIANGLIN
Tang Chaoer
YANG JUN
ZHENG CHAO
ZHOU ZHENGFEI
NIE MENGMENG

Assignees

北京航天动力研究所

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (9)

1. The method for designing the residual thickness of the rupture disk based on test calibration and simulation calculation is characterized by comprising the following steps of: s1, acquiring a real stress-strain curve of a rupture disk material; S2, establishing a finite element simulation model of the rupture disk containing the nicks according to a real stress-strain curve of the rupture disk material; Applying load to the finite element simulation model to simulate, so as to obtain a corresponding pressure value when the rupture disc breaks, and recording the pressure value as simulated breaking pressure P sim ; S3, comparing the simulated fracture pressure P sim with the target fracture pressure P target , and obtaining a design value of the residual thickness of the notch according to a comparison result.
2. The method for designing the residual thickness of the rupture disk based on experimental calibration and simulation calculation as set forth in claim 1, wherein in step S1, the method for obtaining the true stress-strain curve of the rupture disk material includes: Preparing a standard tensile sample of the rupture disc material; Placing a standard tensile sample of the rupture disc material on a universal testing machine for a quasi-static tensile test to obtain an engineering stress-strain curve of the rupture disc material; the engineering stress-strain curve of the rupture disk material is converted to a true stress-strain curve of the rupture disk material.
3. The method for designing the residual thickness of the rupture disk based on experimental calibration and simulation calculation as set forth in claim 2, wherein the engineering stress-strain curve of the rupture disk material is converted into the true stress-strain curve of the rupture disk material according to the following formula: σ true =σ eng ×（1+ε eng ); ε pl_true =ln（1+ε eng ）-σ true /E; Wherein σ true is the true stress, ε pl_true is the true strain, σ eng is the engineering stress, ε eng is the engineering strain, and E is the elastic modulus.
4. The method of claim 1, wherein in step S2, the method of creating a finite element simulation model of the rupture disk including the score from the true stress-strain curve of the rupture disk material comprises: Setting an initial residual thickness h 0 of the nick, and establishing a three-dimensional model of the rupture disk containing the nick; defining the elastoplastic properties of the material in the three-dimensional model according to the true stress-strain curve of the rupture disk material; Defining damage starting and evolution criteria of materials in a three-dimensional model according to the descending section and fracture strain of the stress-strain curve of the rupture disk material obtained through the test; And performing grid division on the three-dimensional model, and defining boundary conditions to obtain the finite element simulation model.
5. The method for designing the residual thickness of the rupture disk based on experimental calibration and simulation calculation according to claim 1, wherein in the step S2, when the load applied to the finite element simulation model is simulated, the calculation is performed by using a display dynamics analysis step, the calculation time is set to be the actual pressurization time, and a time step is set according to the minimum grid size so as to capture the rupture process.
6. The method for designing the residual thickness of the rupture disk based on experimental calibration and simulation calculation according to claim 1, wherein in step S2, a pressure uniform load linearly increasing with time is applied to the pressure-bearing surface of the rupture disk.
7. The method for designing the residual thickness of the rupture disk based on test calibration and simulation calculation according to claim 1, wherein the corresponding pressure value when the rupture disk breaks is the pressure value when the grid cells of the finite element simulation model fail and are automatically deleted.
8. The method for designing the residual thickness of the rupture disk based on experimental calibration and simulation calculation according to claim 1, wherein the step S3 of comparing the simulated rupture pressure P sim with the target rupture pressure P target , the method for obtaining the design value of the residual thickness of the score according to the comparison result comprises the following steps: the residual thickness of the notch in the finite element simulation model is h, |P sim -P targe |= delta P; When Δp is not within the allowable range, if P sim >P target , decreasing h and returning to step S2, if P sim <P target , increasing h and returning to step S2; and obtaining the design value of the residual thickness of the notch until the delta P is within the allowable range.
9. The rupture disc residual thickness design method based on test calibration and simulation calculation of claim 8, further comprising S4 test verification: According to the finally determined design value of the residual thickness of the notch, carrying out a rupture test on a test-fabricated rupture disk sample to obtain the actual rupture pressure; If the error between the actual fracture pressure and the target fracture pressure is not in the allowable range, adjusting the material damage evolution parameters in the finite element simulation model according to the actual fracture test result, and performing one round of calibration simulation of S2-S3 again to further optimize.

Description

Rupture disk residual thickness design method based on test calibration and simulation calculation Technical Field The invention belongs to the technical field of safety pressure relief devices, relates to a design method for accurately determining the residual thickness of a prefabricated notch of a rupture disc, and particularly relates to a digital design method combining material test, finite element simulation and iterative calibration. Background Burst discs (also known as diaphragms) are vital starting pressure build-up and overpressure protection elements in pressure control systems and safety systems, and are often used in media isolation before operation of the system, overpressure protection during operation of the system, and the like. The working principle is that when the system pressure reaches a preset value, the pre-scored rupture disk breaks at the scored position, so that the system rapidly decompresses under the condition of downstream medium supply or overpressure. The accuracy of the burst pressure of the rupture disk is directly related to the reliability and safety of the overall system. Currently, the method for determining the residual thickness of the rupture disc score mainly depends on an empirical formula, analytical calculation and a large number of physical test verification. These methods have the following disadvantages: 1) The experience dependence is high, the selection of the residual thickness of the initial notch is seriously dependent on the experience of a designer, the design period is long, and the final target rupture pressure is greatly deviated. 2) The test cost is high, in order to achieve the target burst pressure precision, a plurality of iterative cycles of design, trial production and test are needed, products and tools are needed to be reprocessed in each iteration, a test system is needed to be disassembled and assembled repeatedly, and the investment of manpower and material resources is large, so that the cost is high. 3) The design period is long, the trial production and test flow of the real object are complex, the real object is easily influenced by the processes of middle communication, turnover and the like, and the development progress of the whole product and even projects is slowed down. 4) It is difficult to simulate real conditions, empirical formulas and analytical calculations are difficult to consider the mechanical response of the rupture disc during complex boundary conditions (e.g., welding constraints), non-linear material behavior (e.g., plastic hardening), and dynamic rupture. With the development of Computer Aided Engineering (CAE) technology, finite element simulation has been widely applied to various mechanical analysis processes such as structural strength and modal calculation, and for the rupture process of a rupture disk with nonlinearity and high dynamic rate, simple dynamic simulation has larger errors between simulation results and actual conditions due to inaccurate material model, inapplicable fracture criteria and the like, and cannot be directly used for high-precision engineering design. Therefore, a design method for the residual thickness of the rupture disc notch, which can remarkably improve the simulation precision, reduce the test times and improve the design efficiency, is urgently needed. Disclosure of Invention The invention aims to overcome the defects, provides a rupture disc residual thickness design method based on test calibration and simulation calculation, solves the technical problems of low design precision, low design efficiency and the like of the conventional rupture disc indentation residual thickness, can remarkably improve the design precision and research and development efficiency of the rupture disc indentation residual thickness, and has important guiding significance for the production and application of the rupture disc. In order to achieve the above purpose, the present invention provides the following technical solutions: a rupture disk residual thickness design method based on test calibration and simulation calculation comprises the following steps: s1, acquiring a real stress-strain curve of a rupture disk material; S2, establishing a finite element simulation model of the rupture disk containing the nicks according to a real stress-strain curve of the rupture disk material; Applying load to the finite element simulation model to simulate, so as to obtain a corresponding pressure value when the rupture disc breaks, and recording the pressure value as simulated breaking pressure P sim; S3, comparing the simulated fracture pressure P sim with the target fracture pressure P target, and obtaining a design value of the residual thickness of the notch according to a comparison result. Further, in step S1, the method for obtaining the true stress-strain curve of the rupture disc material includes: Preparing a standard tensile sample of the rupture disc material; Placing a standard tensile s