Damage evolution on dynamic tensile fracture of ductile metals
Abstract
Dynamic tensile failure, e.g. spallation, of ductile metals is a complex phenomenon, due to its multiple tempo-spatial scales and structural levels involved on one hand, and due to its irreversible and nonlinear features as a non-equilibrium process on the other. Activated/Stimulated by tensile stress, non-uniform mesoscopic structures of materials evolve, leading to internal damage nucleation, growth, coalescence and final fracture, which consist the basic physical processes of dynamic tensile failure of ductile metals. Damage evolution on dynamic tensile fracture of ductile metals has been reported elsewhere, however, our ability to understand the mechanism of damage evolution in micro-scale and to accurately predict fracture in macro-scale is still limited. In this paper, we present investigations on macroscopic response, microscopic mechanism and physical models of dynamic tensile failure, based on our previous works. Current difficulties and challenges encountered when studying such a complex, multi-scale phenomenon are also discussed.
