Correcting method for layer-peeling-method residual stress measurement value based on plate and shell theory

A technology of residual stress and plate and shell theory, which is applied in force/torque/work measuring instruments, measuring devices, special data processing applications, etc. Effect

Inactive Publication Date: 2018-02-23
BEIHANG UNIV
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  • Description
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Problems solved by technology

However, in the process of material removal by delamination, the stress will be released, and the stress value measured directly cannot reflect the initial stress value of the material

Method used

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  • Correcting method for layer-peeling-method residual stress measurement value based on plate and shell theory
  • Correcting method for layer-peeling-method residual stress measurement value based on plate and shell theory
  • Correcting method for layer-peeling-method residual stress measurement value based on plate and shell theory

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Embodiment Construction

[0049] Attached below figure 1 The method flow of the present invention is further described, so that the advantages and characteristics of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly. Among them, attached figure 1 The detection platform described is exemplary and is only used to explain the present invention and is not to be construed as a limitation of the present invention.

[0050] Step 1: Take a rectangular plate workpiece to be tested, set its thickness as H, measure the stress value of its outer surface, and obtain the stress value of the surface layer in the X direction and Y direction. Record the measured X-direction stress on the surface of the workpiece as σ x0,1 , the stress in the X direction is denoted as σ y0,1 . The measurement method of residual stress can adopt one in X-ray diffraction method, drilling method, nano-indentation method;

[0051] ...

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Abstract

The invention provides a correcting method for a layer-peeling-method residual stress measurement value based on the plate and shell theory. For increasing the measurement accuracy of the residual stress inside a material of the layer peeling method, based on the elastic mechanics and the plate and shell theory, a calculating method for releasing of the residual stress inside the material in the material removing process is deduced, and therefore the conversion relationship between surface residual stress peeled layer by layer and initial residual stress of a layer is established; under the condition that all kinds of surface residual stress after layer peeling are known, the initial residual stress of the layer can be reversely calculated and obtained.

Description

technical field [0001] The invention relates to the field of workpiece residual stress detection, and belongs to a correction method for measuring residual stress by a peeling method. Background technique [0002] In the process of industrial production, whether it is various mechanical processing processes, strengthening processes, uneven plastic deformation or metallographic changes, residual stress will inevitably be generated on materials and their products. Residual stress is an internal stress that is self-equilibrium and will remain in the material after the external force and the uneven temperature field have disappeared. This internal stress will have a certain impact on the parts, such as fatigue strength, static strength, brittle failure and so on. These impacts have little impact on ordinary industries, but for some high-tech industries, any impact will have disastrous consequences. Therefore, reasonable and effective control of residual stress is very importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01L5/00
CPCG01L5/0047G06F30/17G06F30/20G06F2119/06
Inventor 高瀚君吴琼张以都周文兵刘畅高子涵
Owner BEIHANG UNIV
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