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A method for measuring residual stress generated by press working of metal materials

A metal material and residual stress technology, applied in the field of metal material measurement and residual stress measurement, can solve problems such as complicated steps and damage to measurement materials, and achieve the effects of convenient operation, less consumables, and low preparation requirements.

Inactive Publication Date: 2018-09-18
SHANGHAI INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for measuring the residual stress produced by pressure processing of metal materials, which solves the problems in the prior art The method of measuring the residual stress produced by the pressure processing of metal materials is complex and will damage the technical problems of the measured materials

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  • A method for measuring residual stress generated by press working of metal materials
  • A method for measuring residual stress generated by press working of metal materials

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Embodiment 1

[0035] A method for measuring residual stress produced by press processing of metal materials, specifically comprising the steps of:

[0036] (1) First measure the specific volume of the metal material to be tested:

[0037] First cut the pressure-processed metal material to be tested into several samples with a mass greater than 1g according to different parts, and measure the specific volume, and then measure the specific volume of the metal material to be tested before pressure processing (annealed state);

[0038] The used instrument of quality measurement in the embodiment of the present invention is CP153 type electronic digital balance, and the sensitivity is 10 -3 g, the relative measurement accuracy of an object with a mass of 10g can reach 0.01%.

[0039] The material to be analyzed and tested is a deformed aluminum alloy with a grade of 6XXX. The purpose of the analysis is to measure the distribution of residual stress inside the material after press processing (up...

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Abstract

The invention discloses a method for measuring residual stress generated by metallic material pressure processing. The method comprises steps of: cutting a certain position of a to-be-measured metallic material subjected to pressure processing, measuring the specific volume of a cut to-be-measured test sample in a block-shape, and measuring the specific volume of the to-be-measured metallic material prior to pressure processing or in a annealing state; computing the average residual stress inside the corresponding position of the to-be-measured metallic material in virtue of a Hooke's law in a stress-strain relationship according to the measured specific volume; measuring the cut test samples of different positions of the processed to-be-measured metallic material, and measuring the average residual stress of the different positions of the to-be-measured metallic material in virtue of the Hooke's law in the stress-strain relationship according to the specific volumes of the different positions and accordingly acquiring the residual stress distribution of the to-be-measured metallic material in a processed state. The method is simple in test sample preparation, universal in measuring instruments, convenient in operation, high in experiment data precision, good in repeatability, and reliable in data.

Description

technical field [0001] The invention belongs to the field of material detection and relates to the measurement of metal materials, in particular to a method for measuring residual stress produced by pressure processing of metal materials. It can measure the distribution of residual stress in different parts of metal materials. Background technique [0002] During the pressure processing of metal materials, the deformation of the material will inevitably generate residual stress inside it. When an external force is applied, the material undergoes elastic and plastic deformation due to three-dimensional stress. After unloading, some deformed parts limit the elastic recovery of other deformed parts, thus generating residual stress. Therefore, residual stress is an elastic stress, which is the result of inhomogeneous plastic deformation in the material. [0003] The residual stress of materials has many applications, it can improve the strength and hardness of materials, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/04
CPCG01L1/04
Inventor 陈锟吴新猛刘克家陈惠芬
Owner SHANGHAI INST OF TECH
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