INFLUENCE OF LOCAL MICROSTRUCTURE ON ELASTIC MODULI OF HIGH EXPLOSIVE COMPOSITES

Abstract eng:
A multiscale homogenization approach, based on the generalized method of cells (GMC) is proposed for examining the influence of local variations in microstructure on the bulk response of heterogeneous high explosive (HE) composite materials. On average, the material consists of 93% brittle crystal particles ranging from 1 µm to 450 µm in size, bound by a plastic polymer material. Using GMC, we analyze the HE elastic response considering several representative volume elements with the same crystal volume fraction but with different particle/binder arrangements. Based on strain rate sensitivity of the composite elastic moduli, we find that these microstructures can be classified as either binder bridging or particle bridging. The microstructures with particle bridging exhibit significantly higher moduli (by an order of magnitude) and lower strain rate sensitivity than do microstructures with binder bridging. Such a classification can be used to reduce the number of configurations that need to be considered in mechanical simulations of HE.

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