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A numerical representation method and system for the stress-strain constitutive relationship of materials

A technology of constitutive relationship and numerical characterization, applied in the direction of analyzing materials, using stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as large performance deviations and inability to meet design refinement requirements

Active Publication Date: 2020-12-11
CHINA SPECIAL EQUIP INSPECTION & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current numerical method of material performance in the American ASME standard, due to the differences in material classification and performance itself, its measurement results often deviate greatly from the performance of actual materials in my country, which cannot meet the refinement requirements of design. It is necessary to seek a method that can accurately characterize Methods and means of physical properties of materials in our country to meet the development requirements of material application and product design

Method used

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  • A numerical representation method and system for the stress-strain constitutive relationship of materials
  • A numerical representation method and system for the stress-strain constitutive relationship of materials
  • A numerical representation method and system for the stress-strain constitutive relationship of materials

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Embodiment 1

[0039] According to the method of the present invention, the materials with different properties are specifically measured, and the numerical model is used to simulate them, and the parameters in the model are obtained to obtain the mechanical properties of the measured materials.

[0040] According to the classification of metal materials into materials with obvious yield stage and materials without obvious yield stage, select the corresponding numerical model. When the material is a material with obvious yield stage, the corresponding stress-strain numerical model for,

[0041] where T s Indicates the minimum temperature at which the yield plateau of the tensile curve disappears, and a and b are parameters in the stress-strain numerical model. By calculating the parameters a and b, the mechanical properties of a material with an obvious yield stage can be characterized.

[0042] When the material is a material without obvious yield strength, the corresponding stress-strain ...

Embodiment 2

[0076] Such as figure 1 As shown, the numerical characterization method of the material stress-strain constitutive relationship in this embodiment of the present invention includes, S101 setting test parameters, and the test parameters include the sample temperature.

[0077] S102 Perform a tensile test on the material according to the test parameters, and acquire tensile test data of the material, where the tensile test data includes stress data and strain data.

[0078] S103 establishing a stress-strain curve according to the stress data and the strain data.

[0079] S104 Select a corresponding stress-strain numerical model according to the properties of the material, fit the stress-strain curve of the material, and obtain parameters in the stress-strain numerical model. The numerical characterization method in the embodiment of the present invention is close to the reality. The stress-strain data of the tensile test is used as the fitting basis, and the numerical model cor...

Embodiment 3

[0094] Such as Figure 5 As shown, one embodiment of the numerical characterization method of the material stress-strain constitutive relationship of the present invention adopts a tensile test to obtain the test data of the material, specifically, S201 formulates the test method according to the material, and sets the sample of the material sample Require, set the strain rate, set the frequency of data and financial resources, set the strain range, set the stretch rate, set the temperature of the test, the sample used in this embodiment of the present invention is as follows Image 6 As shown, a sample with a diameter of 10mm is selected, and the stretching time is divided into room temperature stretching and high temperature stretching, and the stretching rate is set in two cases. When stretching at room temperature, that is, stretching at room temperature, stretching The stretching temperature is between 10°C and 35°C. The stretching temperature can also be set at 23°C±5°C....

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Abstract

The invention relates to the field of materials and provides a method for representing a numerical value of a stress-strain constitutive relation of a material. The method comprises the following steps: setting a test parameter which includes sample temperature; performing tensile test on the material according to the test parameter, thereby acquiring tensile test data of the material, wherein the tensile test data include stress data and strain data; establishing a stress-strain curve according to the stress data and the strain data; and selecting a corresponding stress-strain numerical value model according to the properties of the material, fitting the stress-strain curve of the material and solving the parameters in the stress-strain numerical value model. An error between a result acquired according to the numerical value representing method and a practical value is smaller and the method is more practical. The invention also provides a system for performing the numerical value representing method and the method for acquiring the stress-strain constitutive relation of the material.

Description

technical field [0001] The invention relates to the field of performance characterization methods of materials, in particular to a numerical characterization method and system for the stress-strain constitutive relationship of materials and a method for obtaining the stress-strain relationship of materials. Background technique [0002] For the accurate measurement and calculation of the physical properties of materials, the physical properties of various aspects of materials can be obtained more clearly and specifically, and provide clear and accurate guidance and reference for the practical application of materials, especially in some product applications for materials. In technical fields with strict requirements, products made of corresponding materials are required to meet the safety requirements of product applications, such as special requirements for high temperature, high pressure, flammable, explosive and other applications, with high reliability and stability. For...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/18
CPCG01N3/08G01N3/18G01N2203/0017
Inventor 寿比南陈朝晖朱国栋尹立军钱才富魏安鹏李光海
Owner CHINA SPECIAL EQUIP INSPECTION & RES INST
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