Shock Wave Structure in Particulate Composites

Creators: Rauls, Michael B.; Ravichandran, Guruswami

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Abstract

An experimental study of shock wave profiles in particulate composites of various compositions is undertaken to determine how shock width and rise times depend on the mean particulate size. The composites under examination serve as a model for concrete or polymer bonded explosives, based upon the impedance mismatch between the relatively stiff particulates and compliant matrix. Polymethyl Methacrylate (PMMA) and glass spheres ranging in size from 100 μm to 1000 μm are used in concentrations of 30% and 40% glass by volume for experiments with a single bead size, and up to 50% glass by volume for multi-mode particle size distributions. A linear change in shock wave rise time is observed as a function of mean particulate diameter.

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© 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). The support of the Air Force Office of Scientific Research and Air Force Research Laboratory through the University Center of Excellence in High-Rate Deformation Physics of Heterogeneous Materials (Award # FA9550-12-1-0091) is gratefully acknowledged. Michael Rauls acknowledges the support from the Department of Defense (DoD) through the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program.

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