Numerical simulation and experiments on the dynamic deformation of 921A steel hat-specimen

Experiments of 921A steel pure shear hat specimen and hydrodynamic hat specimen loaded by SHPB were carried out, and the micro-deformation characters were observed by metallograph. Based on the research of the plastic constitutive relationship in high strain rate, numerical simulations of the dynamic deformation process were conducted. The consistency between experimental observation and numerical simulation is satisfactory. It can be seen from the simulation that, the real deformation band in the specimen is wider than the expected, and the strain rate of the material in the band is smaller than the expected. The stress state triaxiality of the material varies in a small range in the deformation process.