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

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...

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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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