Abstract
An accurate description of the mechanical response of metals subjected to high strain rate dynamic loading is important as analyses on high speed metal cutting and automobile crash. In this paper, a physical based constitutive model on the thermal activation mechanism and dislocation dynamics was proposed to present such plastic deformation of Fe-Cr-Ni stainless steel. The dynamic compression loading experiments were carried out by using the Split Hopkinson Pressure Bar (SHPB) at different temperature and strain rate. Material parameters in the constitutive model were determined with a nonlinear optimization algorithm. The constitutive model was implemented in ABAQUS/VUMAT to simulate the adiabatic shear band formation of the “hat” shaped specimen. The comparison between numerical and experiment results validates that the constitutive model proposed is capable to predict the mechanical response of Fe-Cr-Ni stainless steel under dynamic loading.
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