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Method and device for measuring residual stress in components

A technology of residual stress and measurement position, applied in the direction of measuring device, measuring force, using mechanical device, etc., can solve the problem of time-consuming and expensive residual stress field

Inactive Publication Date: 2016-06-22
AIRBUS OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Determination of the residual stress field is a time-consuming and costly process due to the need to transport these components to suitable equipment for inspection

Method used

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  • Method and device for measuring residual stress in components
  • Method and device for measuring residual stress in components
  • Method and device for measuring residual stress in components

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Embodiment Construction

[0031] see figure 1 , the workpiece 10 is formed using known manufacturing processes such as roll forming. Stress graph 12 shows how residual stress varies through the thickness of workpiece 10 from compression (C) to tension (T). It can be seen that this stress profile is symmetric about the longitudinal axis L of the workpiece, and likewise the stresses are balanced so that the workpiece is geometrically stable in this case (in other words, the residual stresses in the deformation of the material are not observed).

[0032] According to the invention, machining operations performed by cutting according to the shown cutting lines 14 and 16 will cause an asymmetrical stress distribution 12 and, consequently, a deflection of the workpiece 10 . As a result, this asymmetry in the stress distribution will induce bending stresses on the workpiece 10 . By releasing the workpiece and allowing it to deform under this asymmetric stress, the degree of residual strain can be measured....

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Abstract

The invention relates to a method and a device for measuring residual stresses in components. A method of measuring the overall stress distribution (12) on a workpiece (10) by progressive cutting (14, 16) and measuring the deflection of the workpiece at the cutting point.

Description

technical field [0001] The invention relates to a method for measuring residual stresses in components. More specifically, the invention relates to a method of measuring residual stresses throughout the thickness in engine components, especially metal components, the stresses of which are raised from the beginning of a certain manufacturing process, such as roll forming. Background technique [0002] During manufacturing processes such as flow forming, it creates residual stresses throughout the thickness of the part. Such stresses are not immediately apparent because they tend to be evenly distributed throughout the thickness of the billet (and thus do not produce a net strain). Residual stress is a hazard when a part is in use because the applied loads can cause higher than expected stresses within the part. Even, if the part is machined to post-roll dimensions, residual stresses can cause unexpected distortion after machining. [0003] It would be advantageous to be ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/00
CPCG01L5/0047G01N19/06G01B21/32G01N3/20G01N3/58
Inventor W·西姆
Owner AIRBUS OPERATIONS GMBH