A finite-element analysis is performed to characterize the impact induced multiscale thermomechanical response of explosively coated aluminum microspheres. Emphasis is placed on accurately describing the dependence of bulk uniaxial stress wave structure, including local stress, strain, and temperature fluctuations occurring near intergranular and material contact surfaces, on grain size, explosive mass fraction, interface adhesion strength, and impact speed. The time-dependent bulk wave structure is obtained by averaging the mesoscale response over representative elementary volumes. This analysis is a preliminary step in assessing the impact sensitivity of energetic composites.
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