基于连续逐层添加的金属增材制造热-力耦合行为数值模拟研究OACSTPCD

Metal additive manufacturing(MAM)is one of the core technologies leading the third industrial technology revolution.However,the problems of deformation,cracking,and degradation of corrosion resistance caused by excessive residual stress are still one of the major bottlenecks hindering the MAM development.In this paper,a numerical simulation study on the MAM thermal-mechanical coupling behavior based on the continuous layer-by-layer addition was carried out with the help of the open-source multiphysics simulation platform Elmer.Among them,the continuous layer-by-layer addition was realized by controlling the activation state of the elements in real time based on the information of time and elements'positions,and the prediction of stress release was realized by artificially setting the Young's modulus of the substrate to a very small value.With regard to the effects of laser energy input and substrate preheating temperature on the MAM thermal-mechanical coupling behavior,it was found that with the gradual decrease of laser energy input or the gradual increase of substrate preheating temperature,the displacement of the component decreased gradually,and the residual stress level of the component was gradually weakened;compared with the laser energy input,the substrate preheating temperature had a greater effect on the MAM thermal-mechanical coupling behavior.