Instrumented pressing of inert powders to study the effect of particle size

Abstract

Abstract. It is well-known that the detonation and mechanical properties of pressed high explosives (HEs) depend on density. Furthermore, specific particle size distributions have been shown to compact more easily and to effect some shock/detonation properties. Theoretically, particle size distributions can be optimized for compaction and performance. Here, in anticipation of future experiments on HE powders, we explore the role of inert particle-size characteristics on compaction properties and pellet integrity. An instrumented compaction instrument was used to press inert powders that have similar particle size distributions to 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX), as well as compounds that are being developed as mock materials for HMX. The measured force and displacement measurements provide information in the form of compaction curves and Heckel plots. The results of the compaction measurements and subsequent Instron compression tests identify 5-iodo-2'-deoxyuridine (IDOX) as a potential HMX mock for density and mechanical strength. Relevant measurements were also made towards calibration and implementation of the modified Drucker-Prager Cap model for compaction of HE powders.