Welding microcell performance test based residual stress computing method

A technology of residual stress and calculation method, applied in measuring devices, instruments, mechanical devices, etc., to achieve the effects of good residual stress, simple and easy operation of test, and accurate load-displacement curve

Inactive Publication Date: 2012-10-31
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a residual stress calculation method based on welding micro-zone performance test to solve the shortcomings in the existing welding residual stress calculation method

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  • Welding microcell performance test based residual stress computing method
  • Welding microcell performance test based residual stress computing method
  • Welding microcell performance test based residual stress computing method

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Embodiment Construction

[0029] The technical process of a residual stress calculation method based on the performance test of the welding micro-area of ​​the present invention is as follows image 3 As shown, the micro-compressive shear experiment was first carried out on the TC4 titanium alloy, and the load-displacement curve of the laser welding micro-area was measured. Cut a sample with a size of 60×10×0.6mm on the weld to be studied (the sample includes the heat-affected zone of the weld and the base metal on both sides of the weld), and the sampling position of the sample is as follows: Figure 5 shown. Grinding the end face of the sample, the grinding method is to grind with 400#, 800#, 1200#, 3000# water sandpaper in sequence, then perform mechanical polishing to make a mirror surface, and then perform corrosion with corrosive agent (the corrosive agent is kroll reagent, the composition is 3~5vol %HF, 10vol%HNO 3 , 85~87%H 2 O), just corrode the outline of the weld. The whole micro-compres...

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Abstract

The invention provides a welding microcell performance test based residual stress detection method, which comprises the following steps of: carrying out a micro-compression-shear test on a welding microcell so as to obtain a load-displacement curve of the welding microcell, establishing a 3D (three-dimensional) finite element model of a micro-compression-shear test process, and carrying out a finite element reverse backstepping method based on an improved Gurson model so as to obtain a true stress-strain relation of the welding microcell; computing the welding residual stress, wherein in the process of carrying out computing on a welding temperature field, the influence of the mechanical property of the welding microcell on the change of the temperature field is not considered; and after the welding temperature field is obtained, in the process of carrying out computing on a welding stress field, taking normal-temperature mechanical property parameters (when the temperature of a weldment is reduced according to the true stress-strain relation of the welding microcell) into a welding computing model, and then obtaining the welding residual stress through computing. The accuracy of the method disclosed by the invention is higher than that of a result obtained by using a residual stress computing method which is implemented through not considering the mechanical property of the welding microcell.

Description

【Technical field】 [0001] The invention relates to the field of welding technology, in particular to a residual stress calculation method based on welding micro-zone performance test. 【Background technique】 [0002] At present, there are many ways to obtain the residual stress of welded joints, including an X-ray residual stress measurement device and method proposed by Zhou Shangqi et al. in 1997, which can effectively measure the residual strain and residual stress in the workpiece within the X-ray penetration range. Three-dimensional distribution. In 1998, Alfred Johan Peter Hassler and others proposed the ultrasonic method for patent application, which can effectively measure the stress on the metal surface. In 2010, Zhang Jin and others proposed a fixed-point non-destructive testing method for internal residual stress of plates for invention patent application, but this method is only applicable to aluminum alloys. For large thick-walled pipeline steel, Xiong Qingren a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00
Inventor 张建勋赵锡龙牛靖郭伟张贵锋朱彤
Owner XI AN JIAOTONG UNIV
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