레이저 용접 테일러드 블랭크의 용접부 물성평가 및 박판성형 해석에 적용

Evaluation of Material Properties of Welding Zone in Laser Welded Blank and Its Application to Sheet Metal Forming Analysis

The material properties of laser welding zone such as strength coefficient, work-hardening exponent, and plastic anisotropic ratio are analytically obtained from those of base metals based on the tensile tests. . The finite element formulation is developed for predicting strain distributions and weld line movements in the forming processes of laser welded blank. The welding zone(WZ) is modelled with the several, narrow finite elements whose material characteristics are based on the experimental results and the analytical equations. In order to show an application of the developed weld element the stamping process of auto-body door inner panel is simulated. FEM predictions are compared and showed good agreements with experimental observations.