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Published 2011 | public
Book Section - Chapter

The Response of Material Heterogeneities to Stress Wave Loading


We present dynamic experiments designed to examine the interaction of a loading wave with material heterogeneities; for example, as representatives of oxidizer particles in energetic materials. In our model experiments, we use a gas gun to load a thin sheet of polymer material containing a cylindrical inclusion. We utilize two different types of inclusions; an elastomer (polydimethysiloxane) and a liquid of high acoustic impedance (glycerol). Full velocity fields, including the first measurements of this type internal to the inclusion, are achieved with a single frame, two-color particle image velocimetry (PIV) system. Vector and contour plots are presented at different times during the event, as well as cross sectional velocity profiles through the inclusion. Clamping the test samples molds with different torques is found to lead to three-dimensional effects in the case of the elastomer.

Additional Information

© 2010 The Combustion Institute. 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. Greg Elliott for valuable input in the PIV measurements, Prof. Jonathan Freund, Dr. Thomas Jackson, Prof. Carlos Pantano, Dr. Ratnesh Shukla and Prof. Scott Stewart for extensive discussions comparing experiments and simulations, and researchers in the DE-9 division at Los Alamos National Laboratories. This work was supported in part by the US Department of Energy through the University of California under subcontract B523 819 and in part by Air Force Office of Scientific Research under A9550-10-C-0008.

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August 19, 2023
October 17, 2023