Abstract
This work presents the response of a porous heterogeneous energetic material subjected to severe loading conditions. Spherical voids are embedded in an otherwise homogeneous material with the mechanical properties of condensed phase explosives. The effect of imposed shocks on spherical (three-dimensional) voids is compared with the cylindrical (two-dimensional) voids studied in an earlier work, in terms of energy deposition and the maximum temperature reached in the material as the void collapses. It is observed that there is a significant rise in maximum temperature of the energetic material in the presence of spherical voids compared to cylindrical voids. In addition to increasing the maximum temperature, the three-dimensional effects also influence the energy distribution as the void collapses. This study also compares mutual void–void interactions by analyzing different relative positions between two voids for both cylindrical and spherical shapes. Apart from the comparison, this study reinforces the importance of micro-scale dynamics in understanding and quantifying the response of an energetic material to shock loading.
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Acknowledgments
This work was performed under grants from the AFOSR Computational Mathematics program (Program Manager: Dr. Fariba Fahroo) and from the AFRL-RWPC (Computational Mechanics Branch, Eglin AFB, Program Manager: Dr. Michael E. Nixon). This research was supported in part through computational resources provided by The University of Iowa, Iowa City, Iowa.
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Kapahi, A., Udaykumar, H.S. Three-dimensional simulations of dynamics of void collapse in energetic materials. Shock Waves 25, 177–187 (2015). https://doi.org/10.1007/s00193-015-0548-5
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DOI: https://doi.org/10.1007/s00193-015-0548-5