The stress-strain curves of the 304 and 316L stainless steels laser-welded materials were obtained by using the equal strain test method.And obvious hardening behaviors due to the tiny crystal of the welded materials were noticed.The dynamic mechanical properties of the 304,316L and welded structure materials were experimentally investigated by SHTB at elevated temperature.Constitutive parameters for the 304 and 316L stainless steels were fitted according to dynamic experimental data.The numerical simulation for the welded structure materials in SHTB test was carried out by LS-DYNA and it was found that stress in the structure materials was non-equilibrium at the early loading stage due to material impedance difference.The strain rate-related parameters in Johnson-Cook constitutive equations for the welded materials were obtained by combining numerical calculation and experimental data.
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