Quantification of Damage in Energetic Granular Material
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Explosive devices suffering an unintentional impact can undergo a possible shock-to-detonation transition. Indeed, the impact generates a shock wave propagating through the material, interacting with microstructural heterogeneities and increasing pressure and temperature locally. These hot spots can potentially lead to detonation [1]. Thus, understanding the consequences of an impact on energetic materials is essential for safety. While certain microstructural features like porosity are known to play an important role [2], the effect of damage parameters such as microcracking and decohesion has not been elucidated to the same extent [3]. To address this problem, we compare the defects present in the initial state and after a controlled impact in both its initial state and after an impact. The aim of this work is to present an approach to identify and analyse statistically the damage in a shocked microstructure. [1] Bowden F. P. and Yoffe A. D., Initiation and growth of explosions in liquids and solids, 1952. [2] Borne L., Influence of intragranular cavities of RDX particle batches on the sensitivity of cast wax bonded explosives, Tenth Symposium (International) on Detonation, 286–293, 1993. [3] Gillibert L. and Jeulin D., Stochastic multiscale segmentation constrained by image content, International Symposium on Mathematical Morphology and Its Applications to Signal and Image Processing, 132–142, Springer, 2011.
