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Shock and Vibration
Volume 2014, Article ID 972414, 8 pages
http://dx.doi.org/10.1155/2014/972414
Research Article

The Pore Collapse “Hot-Spots” Model Coupled with Brittle Damage for Solid Explosives

1Department of Engineering Mechanics, School of Aerospace, AML, Tsinghua University, Beijing 100084, China
2College of Science, National University of Defense Technology, Changsha 410073, China

Received 15 May 2014; Revised 9 September 2014; Accepted 10 September 2014; Published 4 December 2014

Academic Editor: Vadim V. Silberschmidt

Copyright © 2014 L. R. Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper is devoted to the building of a numerical pore collapse model with “hot-spots” formation for the impacted damage explosives. According to damage mechanical evolution of brittle material, the one-dimensional elastic-viscoplastic collapse model was improved to incorporate the impact damage during the dynamic collapse of pores. The damage of explosives was studied using the statistical crack mechanics (SCRAM). The effects of the heat conduction and the chemical reaction were taken into account in the formation of “hot-spots.” To verify the improved model, numerical simulations were carried out for different pressure states and used to model a multiple-impact experiment. The results show that repeated weak impacts can lead to the collapse of pores and the “hot-spots” may occur due to the accumulation of internal defects accompanied by the softening of explosives.