Experimental examination and numerical NAG model analysis of spall sensitivity to microstructure in copper

In order to achieve incipient and complete spallation, plane impact experim ents were performed on three types of copper with different impurity levels . Dependence of the damage behavior on the material microstructure was foun d. The VISAR results of these experiments were used to examine the NAG mode l of Curran et. al. [Phys. Rev. 147 (1987)], which includes a detailed desc ription of microscopic void nucleation and growth dynamics. All measurement s could be fitted by change of a single parameter in the model, the initial nucleation late. The analysis demonstrates the competitive role of void nu cleation and growth in the development of the spall.