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Sensitivity of porous energetic materials depends on meso-structural heterogeneities such as voids, defects, cracks and grain boundaries. Meso-structure of pressed explosives contains voids of arbitrary shapes including elongated voids of various orientations and aspect ratios. Meso-scale simulations to date have analyzed the effect of void morphology on the sensitivity of energetic materials for idealized shapes such as cylindrical, conical, elliptical etc. This work analyzes the sensitivity behavior of elongated voids in a HMX matrix subject to shock loading. Simulations show that sensitivity of elongated voids depends strongly on orientation as well as aspect ratio. Ranges of orientations and aspects ratios are identified that enhance or inhibit initiation. Insights obtained from single elongated void analyses are used to identify sensitive locations in an imaged meso-structure of a pressed explosive sample.

Collapse of elongated voids in porous energetic materials: Effects of void orientation and aspect ratio on initiation