Device and method for measuring toughness damage evolution in process of metal uniaxial tension

A technology of unidirectional stretching and damage evolution, applied in the direction of measuring devices, strength characteristics, instruments, etc., to achieve the effects of easy construction, expanded application range, and reduced errors
CN103149086AActive Publication Date: 2013-06-12SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2013-06-12

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Abstract

The invention discloses a device and a method for measuring toughness damage evolution in process of metal uniaxial tension. The method includes a first step of utilizing a camera and a direct-current low-resistance tester to simultaneously record images and resistance of a sample in the stretching process, wherein the sample is sprayed with random free speckles, a second step of obtaining a strain field of the sample in the stretching process through a digital image correlation DIC) method, and a third step of combining strain increment and resistance increment of the sample in the stretching process to indirectly obtain a damage evolution rule in the stretching process.
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Description

technical field

[0001] The invention relates to the technical field of damage evolution of metal materials in the process of plastic strain, in particular to a device and method for measuring ductile damage evolution in metal uniaxial stretching. Background technique

[0002] How to conveniently and accurately obtain the damage evolution of metal materials during the plastic strain process has always been a difficult problem.

[0003] At present, the main methods of measuring damage are: 1. Direct measurement; 2. Indirect measurement through the change of elastic modulus; 3. Ultrasonic measurement; 4. Indirect measurement through the change of microhardness; 5. Indirect measurement through density change; 6. Through Indirect measurement of resistance change. Among them, in measuring the damage in the process of metal plastic strain, the most commonly used method is to measure indirectly through the change of elastic modulus, that is, to implement cyclic loading and unloadin...

Claims

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