G0301-5-2 Thermo-elasto-plastic Analysis for a Thin Plate subjected the Laser Irradiation : Plastic Analysis and Distributions of Residual Internal Forces after the Cooling Process for the Third Irradiation

Abstract

A research program for investigating the thermo-elasto-plastic behavior when a laser beam is irradiated to the surface of a thin metal plate with cooling its backside is described in this paper. The residual deformation and the residual internal force occur in a thin plate after the cooling process. Therefore the plastic analyses for the second and third irradiation are more complicated. Based on the radial flow rule, the deformation increments can be decomposed into an elastic component and plasticity component on the interaction curve. In this paper, the plastic analysis for the third irradiation, which is obtained after the first and the second irradiation were performed, is treated. Especially, the distributions of the residual internal forces obtained after cooling process for the third irradiation are revealed.