Influence of bulk and interfacial properties on shock compression of metal powders. I. Interaction of a pair of particles

Abstract

This paper studies the physics of shock compaction of metallic powder mixtures by focusing on two particles interacting under conditions of high compressive strain rates. Particle-particle interactions are simulated using a sharp interface Eulerian approach. Specifically, the present work seeks to understand how the disparity in bulk material properties such as yield strength and impedance leads to differences in spreading, heating, and contact area of the materials. In addition, the effects of interfacial phenomena such as friction and interfacial melting are examined using the sharp interface framework. The results show that the extent of interfacial contact between the materials is affected by material deformation and jetting. Of the material properties studied, the impedance mismatch exerts the highest influence on the heating of materials. Material yield strength also plays a significant role; the melting of materials is shown to play a minor role in the spreading and evolution of contact of the materials for the shock strengths tested. By focusing on two particles, this work provides insights elucidating the physics of shock compaction of powder mixtures, specifically the influence of bulk and interfacial properties on the extent of interfacial contact between dissimilar materials.