Description of two-dimensional spallation in pure copper

A new ductile dynamic failure model, based on a porous element consisting of a single spherical void of radius a in a sphere of radius b subject to internal pressure P_g and external stress σ_r = - αP + (α - 1) P_g is developed in the present work. Work-hardening behavior, rate-dependent contribution and inertial effects are taken into account in the model. Stress controlling mechanism is adopted while considering the contribution of void nucleation to rate of porosity Φ. The mathematical model presented here is incorporated in a hydrodynamic two-dimensional finite-difference computer code, to simulate two-dimensional spallation of pure copper. Comparison of numerical calculation with experimental results shows that the model described the process of spall experiment successfully. The future improvements of the model are discussed.