Shock Response of Architectured Interpenetrating Phase Composites

Abstract

Abstract Architectured interpenetrating phase composites (IPCs) show promise for structural aerospace components, but their structure-dynamic property relations are not well understood. In this work, we examine the macroscale and fine-scale dynamic response of interpenetrating phase composites comprising a body-centered cubic steel lattice embedded in an aluminum matrix. Through plate impact simulations, we find that the complex mesoscale geometry reduces shock velocity relative to monolithic constituents, slowing and spreading the shock front via reflection and redirection. In the fine-scale, we can predict several aspects of the oscillatory pressure and longitudinal velocity responses by tracking internal wave reflections. Finally, we observe that the post-shock maximum temperature increases with structural openness, and thermal hotspots form at interfaces parallel to the shock direction, with preferred orientation to maximize the deviatoric strain contribution. The findings in this work provide novel structure-property linkages in the dynamic response of architectured interpenetrating phase composites.