Continuum scale material modeling under large strain, strain rates and pressure incorporating microstructure effect

Microstructure effect on the macroscopic material response becomes more evident under high strain rate deformation. Continuum scale constitutive models requires appropriate modification for representing microstructural features. In this paper three experimental validation tests, namely Taylor impact test, the dynamic extrusion test (DTE, high strain rate) and ECAP (low strain rate), in which the material is subjected to severe plastic deformation and pressure, have been investigated using an advanced constitutive modeling. The average grain size and normalized dislocation density are used as microstructure evolution descriptors and two levels of coupling accounts for the microstructure evolution on the material strength. Numerical simulations have been validated with experimental data for high purity copper with different grain size