The influence of inertial effects on dynamic growth of voids in ductile solids under intense dynamic loading

In this paper, a dynamic damage model in ductile solids under the application of a dynamic mean tensile stress is developed. The proposed model considers void nucleation and growth as part of the damage process under the condition of intense dynamic loading (strain rates ge > 10³s^-1). In the evolution of porosity, work-hardening behavior, rate-dependent contribution and inertial effects are taken into account. Meanwhile, a plate impact test is performed for simulating a dynamic fracture process in pure copper. The damage model is incorporated in a hydrodynamic computer code, to simulate the first few stress reverberations in the target as it spalls and post-impact porosity in the specimen. Fair agreement between computed and experimental results is obtained. Numerical analysis shows that the influence of inertial resistance on initial void growth in the case of high loading rate cannot be neglected.