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Fatigue life analysis and optimization of welded joints in stacker column-footing
Published:2023-11-27 author:XU Shimin, WANG Lihua, CHEN Taimao, et al. Browse: 249 Check PDF documents
Fatigue life analysis and optimization of welded joints in stacker column-footing


XU Shimin, WANG Lihua, CHEN Taimao, WANG Huaiyu, WEI Qike

(Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming, 650500, China)


Abstract: In order to investigate the fatigue life of the welded joints of the stacker foot under working conditions, the fatigue life analysis of the welded joints of the stacker foot under dynamic loading and the optimization of the relevant dimensions affecting the fatigue strength of the fatigue hazard welds were carried out. Firstly, a finite element model of a stacker foot containing a foot weld was established, and the location of the dangerous weld at the foot was determined by static analysis and structural stress analysis at the weld line under typical stress patterns. Then, a finite element model of a stacker containing a dangerous weld at the foot was established, and the fatigue load spectrum of the dangerous weld under dynamic load was obtained by kinetic analysis, and the fatigue life of the dangerous weld under dynamic load was obtained based on the structural stress method. Finally, the dimensions affecting the fatigue strength of the annular weld at the foot were optimized using the response surface optimization method for the case of low fatigue strength of the dangerous weld. The research results show that the column foot ring weld is the column foot fatigue hazard weld; under extreme working conditions, the fatigue life of the stacker hazard weld is 27.14years, which can meet the design service life of the stacker; the optimized hazard weld structural stress is reduced by 15% compared with that before optimization, and the fatigue strength of the hazard weld is greatly improved.

Key words: handling machinery; stacking equipment; stacker column-footing; mechanical strength; weld fatigue strength; structural stress method; response surface optimization
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