Based on the ＂element life anti death＂ technique of＂ Finite Element Analysis （FEA）, a 3D muhi-track anti multilayer numerical simulation analysis for laser metal deposition shaping （LDMS） was conducted with the ANSYS parametric design language （AFDL）. In the simulation, long edge reciprtwating scanning paths were introduced anti Gauss thermal source model was adopted. The computing results showed that the molten pool region and the part of the sample which was close to the substrate were high thermal stress regions, and the thermal stress in the sample was quite low; the thermal stress along the direction of thickness increasing was tensile stress and its amplitude was large, which was the main reason for cracks of the sample ; the beginning point of each deposition layer had great effect on the distribution and intensity of thermal stress, and the thermal stress of the nodes belonging to the first track was almost one time higher than that of the nodes belonging to the last track of the same layer in the sample. Using the same processing parameters, the generation and development of cracks of the samples fabricated by LMDS showed good agreement with the simulation predictions.
High Technology Letters
laser metal deposition shaping, thermal stress field, numerical simulation