Simulation of Thermo-mechanical Behavior Evolution of Multi-laser Beam Additive Manufacture
AM thermo-mechanical coupling model with multi-laser beam(main laser beam,multiple post-processing laser beams)was established.Effects of the multi-laser beam mode on temperature history,overall stress evolution his-tory and equivalent plastic stress distribution during cooling were analyzed,and simulation results were compared with those of single laser beam mode.The results indicate that the temperature history,overall stress evolution history and equivalent plastic stress distribution of cladding layers present similar trends for both modes.As the amount of post-processed laser beams increases,the peak temperature,overall stress and equivalent plastic stress levels are signifi-cantly increased,leading to cracks and fractures.
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