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Method and system for representing numerical value of stress-strain constitutive relation of material

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, measuring devices, etc., can solve problems such as large performance deviations and inability to meet design refinement requirements

Active Publication Date: 2017-10-31
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

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  • Method and system for representing numerical value of stress-strain constitutive relation of material
  • Method and system for representing numerical value of stress-strain constitutive relation of material
  • Method and system for representing numerical value of stress-strain constitutive relation of material

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Embodiment 1

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

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

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

[0042] When the material has no obvious yield strength, the corresponding stress-strain numerical model...

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 sample temperature.

[0077] In S102, a tensile test is performed on the material according to the test parameters to obtain tensile test data of the material, where the tensile test data includes stress data and strain data.

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

[0079] In S104, a corresponding stress-strain numerical model is selected according to the properties of the material, the stress-strain curve of the material is fitted, and the parameters in the stress-strain numerical model are obtained. The numerical characterization method in the embodiment of the present invention is close to reality. The stress and strain data of the tensile test are used as the fitting basis, and the n...

Embodiment 3

[0094] Such as Figure 5 As shown, an 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, which specifically includes, 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 resources, set the strain range, set the stretching rate, and set the temperature of the test. The sample used in this embodiment of the present invention is such as Image 6 As shown, the sample with a diameter of 10mm is selected, and the stretching is divided into room temperature stretching and high temperature stretching. The stretching rate is set in two cases. When stretching at room temperature, it is stretched at room temperature. The stretching temperature is 10℃~35℃, the stretching temperature can also be set to 23℃±5℃, and it can also be set at 20℃ for st...

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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 material performance characterization methods, 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] The accurate calculation of the physical properties of the material can more clearly and specifically obtain the physical properties of all aspects of the material, and provide clear and accurate guidance and reference for the actual application of the material, especially in some product applications of the material In technical fields with demanding requirements, products made of corresponding materials are required to meet the safety requirements of product applications, such as meeting the special requirements of high temperature, high pressure, flammable, explosive and other applications, with high reliability and stability. For example, pressure...

Claims

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Application Information

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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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