On the Effect of Plate Curvature on Welding Deformation

J. Ocean Eng. Technol. 2010;24(2):67-73.

Lee Joo-Sung,Lee Jin-Tae

School of Naval Architecture and Ocean Engineering University of Ulsan,School of Naval Architecture and Ocean Engineering University of Ulsan

용접변형에의 곡률의 영향에 관한 연구

이주성,이진태

울산대학교 조선해양공학부,울산대학교 조선해양공학부

Keywords: Curvature, Curved plate, Inherent strain, Thermal elasto-plastic analysis, Weld-induced deformation

핵심용어: 곡률, 곡판, 고유변형률, 열탄소성해석, 용접변형

Abstract

A simplified finite element analysis has been used to predict the weld-induced deformation to bead-on-plate welding of steel plates having curvatures in the welding direction. In this study, the equivalent loading method based on inherent strain was used to investigate the effect of longitudinal curvature on the weld-induced deformation of curved plates. Equivalent loads were derived from the inherent strain distribution around the weld line, and the loads were used for linear finite element analyses. These kinds of numerical simulations can, of course, be performed by using the rigorous thermalelastic-plastic analysis method. This approach is not, however, practical for use in weld-induced deformation analysis of large and complex structures, such as ship structures, in view of computing time and cost. The present equivalent load approach has been applied to several plate models having curvatures in the welding direction, and the results are compared with those obtained by thermal-elastic-plastic analysis and also with those obtained by the other simplified method found in reference. As far as the present results are concerned, the weld-induced deformation of curved plates can be accurately predicted by the method presented in this paper.