Welding residual stress measurement method based on ABAQUS

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...

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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 be considered comprehensively, but because there are many influencing factors involved in welding, if only the corresponding data is obtained through welding experiments, the rules are obtained, and then verified by practice, it will cost a lot of money and will also It consumes a lot of time and energy, and the cost performance is extremely low. With the rapid development of computer technology, the application of finite element simulation technology in the engineering field has become more and more extensive.

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