A constitutive description of tensile behavior for brass over a wide range of strain rates

In this paper, a new empirically based constitutive model, the modified Johnson-Cook (J-C) model, has been proposed to incorporate the strain rate effects on the initial yield stress and the strain hardening behavior, respectively. The new model can describe the stress-strain relation of metals over a wide range of strain rates. Based on the tensile impact recovery experimental technique, the material constants in the model can be experimentally determined using isothermal and adiabatic stress-strain curves at different strain rates. Good agreement is obtained between the experimental stress-strain curves for brass under both quasi-static and dynamic loadings and the modified model correlations. (C) 2004 Elsevier B.V. All rights reserved.