A Comparison of Shear Localization Susceptibility in U-0.75 Wt Pct Ti and W-Ni-Fe during High Strain Rate Deformation

摘要

A comparison of shear instability in U-Ti vs W alloy-during high strain rate deformation is resented. Experimental quasi-static and dynamic deformation data are used to formulate the constitutive description based on the mechanical threshold stress model (MTS). The MTS model is used to predict the deformation behavior of U-Ti and W-alloy beyond the conventionally achievable experimental capabilities. We suggest that uranium alloys are more prone to catastrophic-localized deformation (adiabatic shearing) due to the existence of a soft high-temperature phase, which is reached by uranium alloys undergoing large strains at high strain rate of deformation.