Welding residual stress measurement method based on ABAQUS

A measurement method and residual stress technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of high cost, deterioration of material performance, low cost performance, etc.

Inactive Publication Date: 2018-09-04
CHINA JILIANG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

When the component is put into use, the working stress and the residual stress inside the component will be superimposed, which will deteriorate the performance of the material
[0004] Generally speaking, many factors will affect the size of residual stress, such as welding material properties, joint form, welding heat source, welding process and welding method, etc. In this case, in order to further understand the variation law of welding deformation and residual stress, The influence of various factors must

Method used

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  • Welding residual stress measurement method based on ABAQUS
  • Welding residual stress measurement method based on ABAQUS
  • Welding residual stress measurement method based on ABAQUS

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Embodiment Construction

[0039] Below in conjunction with embodiment the present invention will be further described.

[0040] Taking T91 steel pipe as the research object, the 3D finite element model of the weldment is established according to the size, size and welding process parameters of the welded workpiece, and the numerical simulation of the 3D geometric model is as follows: figure 1 shown.

[0041] Mesh division: The grid division of the weld and its surrounding area is relatively fine, which can describe the stress field and temperature field of the weldment more specifically. The grid spacing of other parts of the weldment will be relatively large, which is convenient for measurement and reduces the amount of calculation. The global grid division diagram is as follows figure 2 shown.

[0042] Establishment of material database: When welding metal, the physical state of the weld metal undergoes a change from elastic body → elastoplastic body → plastic body → elastic body, so the differen...

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Abstract

The present invention discloses a welding residual stress measurement method based on the ABAQUS. The method comprises: according to the geometry of the test piece, establishing a 3D geometric model of the welded test piece; performing global mesh generation on the model; loading material data and thermal boundary conditions to simulate the welding process; and finally solving the temperature field and the stress field. The numerical simulation results of the method disclosed by the present invention have high accuracy and can be used as an effective tool for welding process design and parameter optimization.

Description

technical field [0001] The invention belongs to the field of stress testing, in particular to an ABAQUS-based welding residual stress measurement method. Background technique [0002] Welding is a typical thermal processing method. During the welding process, the welding residual stress refers to the weld area of ​​the welded structure and its vicinity. Due to the uneven heating and cooling of the welding process and the restraint of the structure, relative stress is caused inside the structure. Deformation or localized plastic deformation, the stress remaining in the structure after the welding process has been completed and completely cooled. It is a kind of internal stress and belongs to the category of secondary stress. [0003] Residual stress widely exists in engineering structures. It refers to the stress that exists inside the structure and maintains self-equilibrium without external force. It is also called inherent stress, internal stress, locking stress, etc. Re...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06G06F2119/08
Inventor 尹香琴孔凡玉缪泽宇陈炜炜沈红威
Owner CHINA JILIANG UNIV
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