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Test and calculation method for determining true stress-strain curve of material

A technology of real stress and strain and calculation method, which is applied in the direction of analyzing materials, using stable tension/pressure to test material strength, measuring devices, etc., to achieve the effect of improving efficiency and high precision

Active Publication Date: 2019-11-26
肖锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] First, compared with the method in literature [1], the DIC test technology is introduced into the uniaxial tensile test. "; on the other hand, cancel the judgment condition for determining the initial breaking point, but directly and objectively determine the initial breaking point

Method used

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  • Test and calculation method for determining true stress-strain curve of material
  • Test and calculation method for determining true stress-strain curve of material
  • Test and calculation method for determining true stress-strain curve of material

Examples

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Embodiment

[0097] This embodiment takes material DP780 as an example, the tensile testing machine model that adopts is Zwick / Roell Z050, the DIC testing system is the ARAMIS system of German GOM company, and the data processing software is EXCEL, specifies the real stress strain of measuring material of the present invention Curve test and calculation methods, such as figure 1 As shown, it includes the following steps:

[0098] Step 1, uniaxial tensile material DIC test, including the following steps:

[0099] The first step is to make the size of the tensile specimen for the uniaxial tensile DIC test of the material DP780, such as figure 2 As shown, the gauge length is 50mm, the width is 12mm, the thickness is 1.4mm, and the initial cross-sectional area is 16.8mm 2 , spray matte paint on the surface of one side of the tensile test piece, and the 50mm gauge length section of the tensile test piece after spraying the matte paint, such as image 3 Then, draw the central axis, the two e...

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Abstract

The invention discloses a test and calculation method for determining a true stress-strain curve of a material, which specifically relates to a uniaxial tensile material DIC test and data output, calculation and drawing of the true stress-strain curve, and acquisition of a whole-course true stress-strain curve and local elongation. According to the invention, a detailed technical process is formulated for the uniaxial tensile test, a clear technical requirement that the number of grids arranged in the width direction of the test piece is twice of the width is provided, an integer scale distance of 1.0 mm is ensured to be taken in the physical sense, the technical target of obtaining the whole-course true stress-strain curve and the local elongation of the material is achieved, cognitive obstacles, technical obstacles and effect obstacles in actual engineering application are swept away, and a road is laid for large-scale engineering application of the material, so that the method has important theoretical and engineering practice significance.

Description

technical field [0001] The invention relates to a test and calculation method for measuring the real stress-strain of a material, in particular to measuring the real stress-strain curve and local elongation of the whole process of the material. Background technique [0002] The purpose of the material uniaxial tensile test is to measure the true stress-strain curve or hardening curve of the material and its related mechanical performance parameters, such as yield strength, tensile strength, uniform elongation, etc. Internationally, the uniaxial tensile test standard mainly There are three: the ASTM standard of the United States, the gauge length of the test piece is 50mm or 2.0inch, and the width is 12.5mm or 0.5inch; the DIN standard of the European Union, the gauge length of the test piece is 80mm, and the width is 20mm; The gauge length of the piece is 50mm and the width is 25mm. [0003] According to the current uniaxial tensile test standard, the processing of test dat...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0075G01N2203/0252G01N2203/0682G01N2203/0641
Inventor 肖锋
Owner 肖锋
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