2017 Volume 35 Issue 2 Pages 146s-150s
The large deformation including bucking may occur due to welding on thin-plate structures. The prediction of welding distortion on thin-plate structures is difficult since change of deformation mode may occur. In this research, in order to evaluate the welding distortion of thin-plate structures, an analysis method that considers large deformation theory in thermal elastic plastic analysis using Idealized Explicit FEM with solid elements was developed. The developed method was applied to the analysis of stiffened thin-plate structures. The influence of heat input Q and welding speed v on large deformation were investigated in the analysis. As a result, it was clear that a buckling-type deformation occurs with larger heat input Q. In addition, it was also found that the bucking-type deformation mode varies with the above factors. It can be assumed that these factors affect the transient deformation behavior on welding and this causes the various generating process of buckling-type deformation. In addition, to discuss the analysis accuracy, the welding distortion of stiffened structure was analyzed and the analyzed results were compared with the experimental measurements. As a result, it was found that both deformations agree with each other. From these results, it was clearly seen that the developed method can stably analyze the welding deformation of stiffened thin-plate structures with large deformation including bucking without introducing initial imperfections.
