Abstract
We study the effect of the crystalline anisotropy and the relative importance of plasticity and friction on the formation of hot-spots in polycrystalline and single crystal β-HMX when impacted at different weak shock strengths with particle velocities 0.1 km/s and 0.4 km/s. We use a continuum model for large deformations that includes an equation of state, single crystal plasticity, fracture evolution, and heat transport. Our results indicate that plastic dissipation creates heterogeneous temperature fields due to crystal anisotropy. At high shock strengths, the temperature due to frictional heating at crack surfaces becomes the critical hot-spot formation mechanism for the conditions and parameters studied here. Furthermore, the predicted temperature is more sensitive to changes in the friction coefficient than the Taylor–Quinney coefficient accompanying the plastic dissipation used in the thermal transport equation.
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