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A method and system for stress reconstruction of workpiece after welding based on finite element

A post-welding, finite element technology, applied in the field of post-welding workpiece stress reconstruction method and system based on finite element, to achieve the effect of reducing calculation time

Active Publication Date: 2022-04-15
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a method and system for reconfiguring workpiece stress after welding based on finite elements, to solve one or more technical problems in the prior art, and to provide at least one beneficial option or create conditions

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  • A method and system for stress reconstruction of workpiece after welding based on finite element
  • A method and system for stress reconstruction of workpiece after welding based on finite element
  • A method and system for stress reconstruction of workpiece after welding based on finite element

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[0062] The concept, specific structure and technical effects of the present disclosure will be clearly and completely described below in conjunction with the embodiments and drawings, so as to fully understand the purpose, scheme and effect of the present disclosure. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0063] In the description of the present invention, several means one or more, and multiple means two or more. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly ind...

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Abstract

The present disclosure provides a finite element-based stress reconstruction method and system of a welded workpiece. The welded workpiece is detected by finite element analysis software to obtain the stress distribution of the entire field residual stress of the welded workpiece, and the gray scale and binary value are performed. The numerical image is obtained by image segmentation, and multiple subgraphs are obtained by image segmentation of the numerical image, and the set of subgraphs is used as a subgraph set, and the threshold value between each subgraph in the subgraph set is obtained. For the subgraphs exceeding the threshold, the subgraphs exceeding the threshold are enhanced with laser, which achieves the beneficial effect of reducing computing time and obtaining a subgraph set approaching the global optimal solution for enhancement.

Description

technical field [0001] The disclosure belongs to the technical fields of stress reconstruction technology and welding residual stress measurement and detection, and in particular relates to a method and system for stress reconstruction of workpieces after welding based on finite elements. Background technique [0002] In the field of marine engineering, the welding process is a crucial part in the construction of large-scale offshore equipment such as crude oil drilling platforms, jack-up wind power installation ships, and crude oil transfer barges CTV (Cargo Transfer Vessel). Welding defects such as pores, slag inclusions, and lack of fusion are prone to appear at the joints, and local grains are coarse, which brings tensile residual tensile stress and microcracks, which affects its toughness, plasticity, strength, and hardness, making it difficult to withstand the service process. Stress corrosion cracking is very easy to occur in the medium, which seriously restricts the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06T7/136G06F119/14
CPCG06F30/23G06T7/136G06F2119/14G06T2207/30152G06T2207/20021
Inventor 蔡舒鹏张永康
Owner GUANGDONG UNIV OF TECH