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Interaction and Multiscale Mechanics Volume 4, Number 2, June 2011 , pages 139-153 DOI: https://doi.org/10.12989/imm.2011.4.2.139 |
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Multiscale modeling of the anisotropic shock response of β-HMX molecular polycrystals |
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Amir R. Zamiri and Suvranu De
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| Abstract | ||
| In this paper we develop a fully anisotropic pressure and temperature dependent model to investigate the effect of the microstructure on the shock response of B-HMX molecular single and polycrystals. This micromechanics-based model can account for crystal orientation as well as crystallographic twinning and slip during deformation and has been calibrated using existing gas gun data. We observe that due to the high degree of anisotropy of these polycrystals, certain orientations are more favorable for plastic deformation – and therefore defect and dislocation generation – than others. Loading along these directions results in highly localized deformation and temperature fields. This observation confirms that most of the temperature rise during high rates of loading is due to plastic deformation or dislocation pile up at microscale and not due to volumetric changes. | ||
| Key Words | ||
| high rate of loading; shock; multiscale modeling; energetic crystals; β-HMX | ||
| Address | ||
| Amir R. Zamiri and Suvranu De: Mechanical, Aerospace and Nuclear Engineering Department, Rensselaer Polytechnic Institute, 110 8th St. Troy, NY 12180, USA | ||
