Constitutive material law improvements for metals that manifest an unstable behavior in dynamic condition

Abstract Numerical analysis is regularly used in engineering practice as useful mean to study component behavior service, especially when an experimental campaign too expensive or not practicable. software becoming more and powerful integrated, leaving the correct use of a material model weak point. As some materials could manifest unstable if deformed at high strain rate, it primary importance appropriate constitutive law reproduce their behaviour. This paper shows results inverse calibration two (Ti-4Al-6V AA 7075-T6) laws classical definition, present literature. Moreover, both them have been modified by authors attempt improving complex The calibrated models are Johnson-Cook (JC) Nowak-Pecherski (NP) models. improvement these showed that JC suitable for calibrate show also after its improvement; conversely NP provided better matching with data.