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Method for detecting residual stress based on inverse problem

A residual stress and detection method technology, applied in the direction of measuring force, measuring device, special data processing application, etc., can solve the problem of not taking into account the different calibration coefficients of residual stress, not considering the influence of removing residual stress, and insufficient residual stress data. Accuracy and other issues, to achieve the effect of easy operation and promotion, low cost and strong practicability

Active Publication Date: 2014-08-20
罗键
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  • Application Information

AI Technical Summary

Problems solved by technology

The current detection method does not take into account the influence of removing material at a certain depth on the measured component on the residual stress of the detected workpiece, nor does it take into account the influence of different calibration coefficients of residual stress at different depths
And for a multi-layer drilling, or for the measured workpiece with non-planar spherical or cylindrical structure or a newly discovered material, it is difficult to use the small hole method to realize the residual stress due to the lack of corresponding residual stress calibration coefficients. Measurement, or the data of the measured residual stress is not very accurate

Method used

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  • Method for detecting residual stress based on inverse problem
  • Method for detecting residual stress based on inverse problem
  • Method for detecting residual stress based on inverse problem

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Effect test

specific Embodiment 1

[0043] One-time drilling of planar structure workpiece to detect residual stress. It is a stainless steel laser-welded honeycomb panel with a length of 18cm, a width of 12cm, and a thickness of 2.0mm, and its welding residual stress value is measured. The residual stress value of the workpiece is detected by using the reverse thinking method to detect the residual stress. The residual stress calibration coefficients A=-5.87591418476E-07 and B=-1.41076852438E-06 of the material and structure are calculated by ANSYS or ABAQUS numerical simulation software. Then, the strain value at this position was measured by the actual small hole stress release method. According to the residual stress calibration coefficient and the measured strain value, the detected welding residual stress is σ 1 =-516.98MPa and σ 2 =-483.15MPa.

specific Embodiment 2

[0044] Detection of residual stress and its distribution along the thickness direction of non-planar structure workpiece. The test is a Q235 steel cylindrical structure. The diameter of the small hole is 2mm, and the holes are drilled layer by layer in 12 steps along the thickness direction. , 0.5mm, 0.6mm, 0.8mm, 1.0mm. The residual stress calibration coefficient A obtained by independent programming calculation using this method jj The relationship curve between the sequence and the diameter of the sample cylinder is as follows Figure 5 shown. The residual stress detected by this method using the planar element is different from the residual stress value detected by the cylindrical element. The residual stress value of the cylindrical structure detected by this method using the cylindrical element is more accurate, and the detection error is less than 5%. The relationship curve between the obtained residual stress value and the average drilling depth is as follows: Im...

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Abstract

The invention discloses a residual stress detection method based on an inverse problem, which includes: adopting a reverse thinking based on an inverse problem, using a modern numerical simulation method to calculate a residual stress calibration coefficient, measuring its strain value through a small hole method, and then using the obtained The residual stress calibration coefficient and residual stress detection calculation model can finally obtain the actual residual stress value of the material or structure.

Description

Technical field: [0001] The invention belongs to the field of residual stress detection and relates to a computer-aided residual stress detection method based on an inverse problem. Background technique: [0002] Various mechanical processes such as casting, cutting, welding, heat treatment, assembly, etc. will cause different degrees of residual stress in the workpiece. The existence of residual stress, on the one hand, will reduce the strength of the workpiece, causing process defects such as deformation and cracking of the workpiece during manufacturing; on the other hand, it will change the size of the workpiece or make its fatigue strength, Reduced mechanical properties such as stress corrosion. Therefore, the measurement of residual stress is of great significance to ensure the safety and reliability of workpieces. At present, the traditional residual stress measurement methods are mainly divided into two categories. (1) Physical detection methods mainly contain x-r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/00G01N19/00G06F17/50
Inventor 罗键王颖
Owner 罗键
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