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Effects of Welding Residual Stress on Compressive Behavior and Ultimate Strength of Corroded Plate
Shingo Tamagawa,You-Chul Kim 한국강구조학회 2010 International Journal of Steel Structures Vol.10 No.2
This study examined the effects of welding residual stress on the compressive behavior and the ultimate strength of the corroded plate. First, welding residual stress was obtained by the thermal elastic-plastic analysis. Then, the change of welding residual stress and the deflection due to the volume loss was investigated by using a newly developed program based on FEM. Finally, the effects of welding residual stress on the compressive behavior and the ultimate strength of the corroded plate were investigated by the elastic-plastic large deformation analysis. As results, the beginning point of the reduction of the initial stiffness with welding residual stress was earlier than that without welding residual stress. Such effect was observed significantly in the case that the volume was lost in the region which has compressive residual stress. Furthermore, the ultimate strength of the corroded plate was reduced by welding residual stress regardless of the plate length, the corroded regions and the reduction of the thickness. The effect of welding residual stress on the ultimate strength became small with the decrease of the thickness.
You-Chul Kim,박도현,Mikihito Hirohata,Shingo Tamagawa 한국강구조학회 2010 International Journal of Steel Structures Vol.10 No.4
A series of analyses was carried out to elucidate treatment of welding imperfection for simulating elastic-plastic behaviors of steel plates under compressive loads. A thermal elastic-plastic analysis based on infinitesimal deformation theory was carried out on a single-pass butt-welding of thin steel plates to predict welding distortion and welding residual stress. The obtained welding distortion and welding residual stress were introduced into an elastic-plastic large deformation analysis as initial imperfection. However, it was elucidated that welding distortion and welding residual stress could not be reproduced precisely due to unbalanced force caused by the difference between both analysis theories. Therefore, it should be confirmed whether the introduced welding distortion and welding residual stress were reproduced with high accuracy. Consequently, if welding distortion and welding residual stress cannot be reproduced, the treatment such as the convergence calculation method applied in this study should be done for precise elucidation of the elastic-plastic behavior of plates under compressive loads.