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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

Active Publication Date: 2013-06-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a device and method for measuring the ductile damage evolution of metal in uniaxial tension in view of the existing technical deficiencies in measuring the damage evolution of metal materials in the process of plastic strain

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Material: SPCC (Baosteel)

[0043] Tensile sample preparation: According to the ASTM standard small sample, it is prepared by wire cutting, and the geometric dimensions are as follows: figure 2 shown.

[0044] Test platform construction: in figure 1 In the process, random free speckle is sprayed on the surface of the prepared tensile sample 1, and the insulating plate 2 is glued on the sample clamping part by superglue, and then the tensile sample is clamped by the clamp 3 of the tensile testing machine. A light source 4 is placed on or beside the tensile sample 1, and a camera 5 is fixed on a tripod at a certain distance from the front to ensure that the lens of the camera is perpendicular to the surface of the tensile sample. The four lead wires of the DC low resistance tester 6 are respectively connected to the straight arm part of the tensile sample 1. It should be noted that two of the four lead wires are for direct current, and the other two are for testing v...

Embodiment 2

[0048] Material: SUS304 (Baosteel)

[0049] Sample preparation: according to the ASTM standard small sample, prepared by wire cutting, the geometric dimensions are as follows figure 2 shown.

[0050] Test platform construction: consistent with the steps in Example 1.

[0051] Test data processing: the steps and process of data processing are the same as those in Example 1. The change of load and resistance during the stretching process of SUS304 tensile sample is as follows: Figure 9 shown. The full-field strain distribution of a certain load step in the necking stage of the tensile specimen in the stretching process is as follows: Figure 10 (side) shown. Also process corresponding data according to embodiment 1, can obtain the relation between the strain of the maximum plastic strain position in the gauge length of the tensile sample and the electric resistance as follows Figure 11 shown. The change of damage of each point with the increase of plastic strai...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/06
Inventor 张赛军袁宁周旭辉
Owner SOUTH CHINA UNIV OF TECH
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