Method for measuring poisson ratio of material based on biaxial stretching test

A technology of biaxial stretching and measurement methods, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of cutting, measuring, and non-metallic materials that are not fully applicable to research objects, and achieve simple steps and easy implementation Effect

Active Publication Date: 2019-01-11
SOUTHEAST UNIV
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Problems solved by technology

[0003] This type of processing method is acceptable for the determination of large batches of materials, but in actual production and research, there are often problems such as the actual material size limitation or the inability to cut the research object, or it is not fully applicable to non-metallic materials such as biological materials, so it is not suitable. Poisson's ratio can be measured in full accordance with existing standard test procedures

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  • Method for measuring poisson ratio of material based on biaxial stretching test
  • Method for measuring poisson ratio of material based on biaxial stretching test
  • Method for measuring poisson ratio of material based on biaxial stretching test

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Embodiment Construction

[0020] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] refer to Figure 1 ~ Figure 3 , according to one embodiment of the present invention, a kind of material Poisson's ratio measurement method based on biaxial tensile test, comprises the following steps:

[0022] (1) Paste the single strain gauge 1 along the x tensile direction of the biaxial test piece 2, stick it on the bidirectional stress area, and connect and debug it with the strain acquisition device;

[0023] (2) The biaxial test piece 2 can be made of the same material, or it can be obtained by welding or connecting different materials, but its bidirectional stress area, that is, the position where the strain gauge 1 is pasted, should be the target material and the stress level in this area should be at As uniform as possible within the elastic range, within plus or minus 5%.

[0024] (3) Connect and clamp the biaxial test piec...

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Abstract

The invention discloses a method for measuring the poisson ratio of a material based on a biaxial stretching test. The method comprises the following steps: pasting a strain gauge along a certain stretching direction of a biaxial test piece, connecting with a strain meter, connecting and fastening the biaxial test piece to a biaxial testing device, operating the biaxial testing device, carrying out elastic loading and unloading according to a given loading track to obtain a curve that a strain value of the strain gauge is changed with time, determining a zero point and a corresponding positionof the loading curve at the moment, and calculating the poisson ratio mu of the material based on a formula according to the value of the position. The method is simple in steps, easy to implement, capable of measuring the poisson ratio by using a single chip and suitable for measuring the poisson ratio of a complex material or a novel material.

Description

technical field [0001] The invention belongs to the technical field of physical performance testing of engineering materials, in particular to a method for measuring Poisson's ratio of materials based on biaxial tensile tests. Background technique [0002] Poisson's ratio is one of the basic mechanical parameters of materials and an essential parameter for mechanical analysis. For general materials, it can be obtained by consulting the manual. For complex materials or new materials, such as composite materials or alloys with different components, you need Test to measure, at present, GB / T 22315-2008 gives the test method of elastic modulus and Poisson's ratio of metal materials, including static method to measure Poisson's ratio, dynamic method to measure dynamic Poisson's ratio, and the static method needs to paste two The Poisson's ratio can only be obtained through strain gauge tests and data post-processing. Although the statistical deviation is less after multiple tests...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 张大海费庆国柳友志刘璟泽何顶顶
Owner SOUTHEAST UNIV
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