Studies of Dynamic Damage Behavior in LY12 Aluminum Alloy under the Condition of High Loading Rate

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 subjected to internal pressure pg and external stress r=-p+(-1)pg is developed in this paper. Work-hardening, rate-dependent contribution and inertial effects are considered in the model. Stress controlling mechanism is adopted while considering the contribution of void nucleation to rate of porosity . The mathematical model presented here is incorporated in a hydrodynamic two dimensional finite-difference computer code, to simulate two dimensional spallation of LY12 aluminum alloy. Comparison of numerical calculation with experimental results shows that the model described the process of spall experiment successfully. The future improvement of the model is discussed.