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arXiv · 1711.02769

Multiscale Modeling of Shock Wave Localization in Porous Energetic Material

Mitchell A. Wood·David E. Kittell·Cole D. Yarrington·Aidan P. Thompson
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Abstract

Shock wave interactions with defects, such as pores, are known to play a key role in the chemical initiation of energetic materials. The shock response of hexanitrostilbene is studied through a combination of large scale reactive molecular dynamics and mesoscale hydrodynamic simulations. In order to extend our simulation capability at the mesoscale to include weak shock conditions (< 6 GPa), atomistic simulations of pore collapse are used to define a strain rate dependent strength model. Comparing these simulation methods allows us to impose physically-reasonable constraints on the mesoscale model parameters. In doing so, we have been able to study shock waves interacting with pores as a function of this viscoplastic material response. We find that the pore collapse behavior of weak shocks is characteristically different to that of strong shocks.

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Mitchell A. Wood, David E. Kittell, Cole D. Yarrington, Aidan P. Thompson. 2017-11-07. Multiscale Modeling of Shock Wave Localization in Porous Energetic Material. https://doi.org/10.1103/physrevb.97.014109

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