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Residual stress testing method

A technology of residual stress and test pieces, applied in the direction of testing material hardness, measuring devices, instruments, etc., can solve problems such as lack of depth, less systematic and comprehensive research, and weak experimental tests

Inactive Publication Date: 2014-05-21
徐世铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the research process of the indentation method, whether it is theoretical analysis, numerical analysis, or experimental research of the indentation response, it lacks a certain depth, but lacks systematic and comprehensive research, and is relatively weak in experimental testing.

Method used

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Embodiment Construction

[0013] The residual stress test method of the present invention is as follows.

[0014] A certain load is applied to the test point of the test piece by the indenter, so that the indenter produces plastic deformation on the surface of the test piece; a spherical crown-shaped indentation is formed, and a stress field is generated around the indentation.

[0015] The residual stress σ can be calculated by the following formula,

[0016] σ = 3 P m 2 { 1 - 2 v 3 × a 2 r 2 [ 1 - ( z u 1 2 ...

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Abstract

The invention provides a residual stress testing method relating to an indentation testing method based on a residual stress strain relationship. The residual stress testing method based on an indentation method is simple in operation method, has certain depth in theoretical analysis, numerical analysis and experiment research and is systemic and comprehensive. The residual stress testing method comprises the following steps: applying a certain load to a to-be-tested point of a test piece by virtue of a pressure head, so as to enable the pressure head to generate plastic deformation on the surface of the test piece; forming a spherical crown-shaped dent, and generating a stress field around the dent; calculating a residual stress sigma according to a formula (described in the specification), wherein r represents for the radius, a represents for the size of a contact surface of the dent, and v represents for the elastic modulus of the test piece.

Description

technical field [0001] The invention relates to an indentation test method based on the residual stress-strain relationship. Background technique [0002] The indentation method is in the research stage and is considered to be a very promising residual stress testing method. Researchers have done a lot of research and experimental work in this field; exploring the effects of residual stress on hardness, stiffness, loading work and plasticity The area and the influence law of the indentation response make the measurement principle, measurement technology, and experimental means regionally feasible, and apply the indentation test means to the research of the actual test of residual stress. [0003] However, in the research process of the indentation method, whether it is theoretical analysis, numerical analysis, or experimental research of the indentation response, it lacks a certain depth, but lacks systematic and comprehensive research, and is relatively weak in experimental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/42G01N3/00
Inventor 徐世铭盛婷婷
Owner 徐世铭
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