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CEA-Gramat studies the sensitivity of energetic materials to enhance theirsecurity and reliability. The conditions leading to the initiation of anexplosive must be understood to control its sensitivity. According to the hotspots theory, the shock initiation of heterogeneous explosives is related totheir microstructure: the shock interacts with the heterogeneities of themicrostructure (pores and inclusions, morphology of grains and fragments,debonding, etc.) and creates local deposits of energy. To describe these hotspots, energetic materials have to be modeled at a scale allowing thediscretization of their microstructure: the mesoscale. Micro-computedtomographies of energetic materials are done at CEA-Gramat and analyzed tobuild geometric models used in finite element simulations. Two kinds of modelsare studied:-Real models are directly built on the real microstructuresextracted from micro-computed tomographies.-Virtual models are based on thesame microstructures but simplified to study independently the effects ofmicrostructural parameters (granulometry, porosity, filler content{\ldots}) onthe creation of hot spots. Compositions based on different kind of RDXparticles in an inert binder are studied through numerical simulation. Theinfluence of particle shape on the inert shock response is investigated at themesoscale. Local heterogeneities of pressure and temperature fields appearintimately related to the morphological properties of the microstructures.Particles with sharp edges create more hot spots than spherical particles.

Influence of the shape of RDX grains on the creation of hot spots by mesoscale modeling