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Residual stress estimation method and residual stress estimation device

A residual stress, specific technique, applied in the direction of measuring devices, testing material strength using applied stable tension/compression, measuring force, etc.

Inactive Publication Date: 2017-11-28
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past, users set the analysis range based on experience and trial and error, and did not necessarily set an appropriate analysis range.

Method used

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  • Residual stress estimation method and residual stress estimation device
  • Residual stress estimation method and residual stress estimation device
  • Residual stress estimation method and residual stress estimation device

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] The residual stress estimating device of this embodiment does not use the measured value of the structure, but estimates the residual of the structure based on the inherent strain method with respect to the analysis range set by the user based on the analytical solution obtained by analyzing the strain generated in the structure. stress.

[0041] [Structure of Residual Stress Estimation Device]

[0042] The residual stress estimation device 1 is realized by a microcomputer 10 . Such as figure 1 As shown, the microcomputer 10 includes a main body 11 , an input unit 12 , and a display unit 13 . The main body 11 has a central processing unit 111, a read-only memory 112, a random access memory 113, a hard disk 115, a reading device 114, an input-output interface 116, and an image output interface 117. The hard disk 115, the reading device 114, the input / output interface 116, and the image output interface 117 are connected via a bus.

[0043] The CPU 111 can execute the...

Embodiment approach 2

[0121] In the theoretical analysis process (step S1 ), the residual stress estimating device of the present embodiment analyzes the stress generated by the processing of the structure based on the Hertzian contact theory.

[0122] The rest of the configuration of the residual stress estimating device according to the present embodiment is the same as that of the residual stress estimating device 1 according to the first embodiment, so description thereof will be omitted.

[0123] Theoretical analysis processing of the residual stress estimating device of this embodiment will be described. The Hertzian contact theory is used to analyze the stress of point contact or line contact between two elastic bodies. Here, a case where Hertzian contact theory is applied to crankshaft roll processing will be described.

[0124] Roll processing is a kind of plastic processing. The stress in the case where plastic deformation occurs cannot be calculated from the Hertzian contact theory, bu...

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Abstract

Provided are a residual stress estimation method and a residual stress estimation device that are capable of setting a suitable analysis range without being affected by user experience. The residual stress estimation device displays analysis results from analysis of strain arising in a structure, without using measurement values for the structure. The user determines the position and size of the analysis range on the basis of the analysis results and enters into the residual stress estimation device: the determined position and size of the analysis range; and the measurement value for the residual stress for cut-off pieces at the measurement point for the structure. The residual stress estimation device: estimates the inherent strain distribution in the analysis range so as to approximate the inherent strain distribution obtained from the input measurement value for residual stress in the cut-off pieces; and estimates the residual stress of the structure on the basis of the inherent strain.

Description

technical field [0001] The present invention relates to a residual stress estimation method and a residual stress estimation device for estimating residual stress of a structure based on an intrinsic strain method. Background technique [0002] Residual stress generated in structures may cause damage such as fatigue cracks, and it is important to accurately grasp the distribution of residual stress in structures. As a method of estimating the residual stress of a structure, a method using an intrinsic strain method is known (for example, refer to Patent Documents 1 and 2). [0003] In the residual stress estimation method based on the conventional intrinsic strain method, two kinds of cut pieces are cut out from the structure, the elastic strain or residual stress is measured for each cut piece, and the elastic strain or residual stress of the cut piece to be measured is measured. The value is applied to the deanalysis process based on the finite element method. In the ana...

Claims

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Application Information

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IPC IPC(8): G01L1/00
CPCG01L5/0047G06F30/23G06F30/15G01L1/00G01N3/08G01N2203/0075G01N2203/0218G01N2203/0246
Inventor 冲田圭介中川知和山田真理子
Owner KOBE STEEL LTD