A mathematical model for the rate of growth of microvoids under mean tensile stress in dynamic processes is developed, which represents an extension of previous analysis of ductile void growth rates using the hollow sphere model. A viscoplastic material is assumed for which the isotropic hardening saturates as the strain progresses. The microvoid growth model is used as an internal damage variable in Perzyna's elasto-viscoplastic constitutive theory for solids experiencing ductile modes of material, having been taken from our application of the viscoplastic-damage constitutuve theory to model shock-induced high strain-rate deformation and spall fracture in polycrystalline solids.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering