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Published January 2010 | Published
Book Section - Chapter Open

Effect of Loading Wave Profile on Hydrodynamic Void Collapse in Detonation Initiation


We experimentally and numerically investigate void collapse as a mechanism for detonation initiation in porous energetic materials under a stress-wave loading condition, representative of accidental mechanical insult. In contrast to the step loading of a shock, a stress wave induces a ramp loading, where length scales of the wave may be comparable to the void size. Using an inert and transparent polymer material, we decouple the reactive and material aspects of void collapse, and focus instead on the hydrodynamic process of interactive void collapse. Diagnostic techniques include high speed shadowgraph movies of the collapsing voids and particle image velocimetry in the surrounding material. Two dimensional finite volume simulations compare the interaction of a single void undergoing ramp and shock wave loading. Voids exhibit asymmetric collapse, with formation of a high speed jet that originates from proximal wall of the void. Data obtained, including internal volume histories and collapse times of current experiments and simulations, are reported and compared with shock-induced cavity collapse data from the literature.

Additional Information

© 2010 by University of Illinois at Urbana-Champaign. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. AIAA 2010-771. The authors gratefully acknowledge Prof John Lambros for the generous loan of laboratory equipment and space which made this study possible. We thank Matthew Parker for his initial experiments, Prof Jonathan Freund, Prof Carlos Pantano, and Prof Scott Stewart for useful discussions comparing experiments and simulations, and Prof Greg Elliott for helpful input with PIV measurements. We also thank Dr Eric Johnsen and Prof Tim Colonius for sharing their numerical data. This work was supported in part by the US Department of Energy through the University of California under subcontract B523819.

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