Studies on Rate-dependent Macro-damage Evolution of Materials at High Strain Rates

Dynamic damage evolution and its influence on the constitutive relation for materials in high strain rate are experimentally and theoretically studied. It is revealed that damage evolution is a rate-dependent process depending on both strain and strain rate, and can be modeled by the thermo-activation mechanism. For polymer PMMA, PP/PA blend and concrete, the coupled damage evolution law and the rate dependent constitutive relation (DM-ZWT model) are obtained and well supported by the experimental data.