Influence of weld-induced residual stresses on the hysteretic behavior of a girth-welded circular stainless steel tube

[摘要] The present study attempts to characterize the relevance of welding residual stresses to the hysteretic behaviour of a girth-welded circular stainless steel tube under cyclic mechanical loadings. Finite element (FE) thermal simulation of the girth butt welding process is first performed to identify the weld-induced residual stresses by using the one-way coupled three-dimensional (3-D) thermo-mechanical FE analysis method. 3-D elastic-plastic FE analysis equipped with the cyclic plasticity constitutive model capable of describing the cyclic response is next carried out to scrutinize the effects that the residual stresses have on the hysteretic performance of the girth-welded steel tube exposed to cyclic axial loading, which takes the residual stresses and plastic strains calculated from the preceding thermo-mechanical analysis as the initial condition. The analytical results demonstrate that the residual stresses bring about premature yielding and deterioration of the load carrying capacity in the elastic and the transition load ranges, whilst the residual stress effect is wiped out quickly in the plastic load domain since the residual stresses are nearly wholly relaxed after application of the cyclic plastic loading.

[发布机构] Graduate School of Construction Engineering, Chung-Ang University, Huksuk-ro, 84, Dongjak-ku, Seoul; 06974, Korea, Republic of^1;Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam^2;Department of Civil and Environmental and Plant Engineering, Chung-Ang University, Huksuk-ro, 84, Dongjak-ku, Seoul; 06974, Korea, Republic of^3;Department of Civil and Environmental Engineering, Inha Technical College, Inharo, 100, Nam-Gu, Incheon; 22212, Korea, Republic of^4;Department of Civil Engineering, Chung-Ang University, Huksuk-ro, 84, Dongjak-ku, Seoul; 06974, Korea, Republic of^5

[效力级别] 运输工程

[关键词] Cyclic mechanical loading;Elastic-plastic FE analysis;Hysteretic behaviour;Hysteretic performance;Residual stress effects;Thermo-mechanical analysis;Threedimensional (3-d);Welding residual stress