A method and apparatus for analyzing a welded structure

Abstract

The invention discloses a method and apparatus for analyzing a welded structure. The method comprises the steps of: obtaining a three-dimensional model of the welded structure; acquiring a welding joint standard model corresponding to each weld on a three-dimensional model of the welding structure, wherein the welding joint standard model is preset; performing finite element mesh generation on thethree-dimensional model of the welded structure; loading welding result data of each of the welding joint models from a welding structure calculation database, and performing strength and fatigue analysis on the three-dimensional model of the welding structure according to the welding result data of each of the welding joint models, wherein the welding structure calculation database is established in advance; if it is judged that the result of the strength and fatigue analysis meets the design requirement, outputting the message that the welded structure is qualified. The apparatus is used toperform the method described above. The analysis method and the device of the welding structure provided by the invention improve the reliability of the welding structure.

Description

technical field [0001] The invention relates to the technical field of intelligent manufacturing, in particular to an analysis method and device for a welded structure. Background technique [0002] High-speed trains are mainly made of high-strength aluminum alloys of 7000, 6000, and 5000 series JIS and EN standards, especially 7000 series Al-Zn-Mg alloys. The base metal is easy to strengthen, and the welded joints have strong natural aging ability, so they are widely used It is used in key bearing parts such as the underframe of high-speed trains. The chassis is a large and complex structure, which adopts hollow profiles with thick and complex cross-sections, large thick plates, including various joint types, and mainly adopts the method of melting inert gas shielded welding. [0003] Due to the characteristics of the aluminum alloy material itself and the limitations of the strengthening mechanism, the arc welded aluminum alloy welded joints are prone to the following pro...

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Problems solved by technology

[0003] Due to the characteristics of the aluminum alloy material itself and the limitations of the strengthening mechanism, the arc welded aluminum alloy welded joints are prone to the following problems: (1) large residual stress is generated; (2) the joints are severely softened and the strength is excessively reduced due to the influence of welding heat

A large number of statistical data show that more than 90% of the fractures in aluminum alloy welded structures are caused by fatigue damage at welded joints. Once a fatigue accident occurs, it will cause incalculable damage to high-speed trains and endanger people's lives.

The traditional welded structure design ignores the influence of the residual stress and phase transformation generated during the welding process on the welded area, and the finite element model cannot accurately predict the mechanical behavior of the welded joints, which leads to poor welded structure design and service process For example, stress corrosion cracks and fatigue cracks appear in aluminum alloy structures on high-speed trains after several years of service, in which welding residual stress plays a key role in crack initiation

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