A Constitutive Model for Materials under High-Temperature and Pressure

D.J.Steinberg, S.G.Cochran, and M.W.Guinan (SCG) presented a constitutive model for metals applicable at high strain rate in 1980. A new expression for the temperature related term in SCG model was suggested in this work. The expression gives that their moduli vanish at melting temperature, i.e., G(Tm)=0. Therefore, SCG model with the suggested expression can be used to describe material properties under high temperature. We have carried out calculations for Al and 93W, the theoretical results are in agreement with that of experiments very well.