Continuum framework for the rate-dependent behavior of anisotropically damaged ductile metals

The present paper deals with a general thermodynamic framework for the modelling of temperature and rate dependent deformation behavior of anisotropically damaged elastic-plastic materials subjected to impact loadings. Based on the concepts of continuum damage mechanics, rate-dependent constitutive equations are derived from the first and second law of thermodynamics which are only based on a limited number of material parameters. Identification of the constitutive parameters is discussed and the applicability of the present continuum damage approach is demonstrated by numerical simulations of low and high strain rate tension tests. The evolution of different data is studied and compared with available experimental results.