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Structure of shock waves in particulate composites

Rauls, M. B. and Ravichandran, G. (2020) Structure of shock waves in particulate composites. Journal of Applied Physics, 127 (6). Art. No. 065902. ISSN 0021-8979.

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The shock compression response of particulate heterogeneous solids was investigated using normal plate impact experiments and numerical simulations. A model composite system of silica glass spheres embedded in a matrix of thermoplastic polymer, polymethyl methacrylate, was developed to mimic the impedance mismatch of structural and energetic heterogeneous materials. Shock wave profiles were measured at multiple points on the rear surface of the composite specimens to characterize shock dispersion and spatial heterogeneity in material response due to the random distribution of particles. Composites with single mode as well as bimodal bead diameter distributions were subjected to plate impact loading at ∼1000 m/s resulting in an average shock stress of ∼4 GPa. Shock rise times were measured for composites of 30% and 40% glass by volume, with spherical particles of diameters in the range of 100–1000 μm. In the case of single mode composites, the shock wave rise times were observed to scale linearly with particle diameter divided by the bulk shock wave speed. The addition of a second bead size to a base size in a 30% glass by volume composite mix resulted in significant increases in shock rise time. Numerical simulations were used to develop insights into scattering and the development of shock structure in particulate composites. Shock disruption mechanisms due to particles and matrix/interface damage effects are discussed.

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Ravichandran, G.0000-0002-2912-0001
Additional Information:© 2020 Published under license by AIP Publishing. Submitted: 23 August 2019; Accepted: 25 January 2020; Published Online: 12 February 2020. 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 No. FA9550-12-1-0091) is gratefully acknowledged. M. B. Rauls acknowledges the support from the Department of Defense (DoD) through the National Defense Science and Engineering Graduate Fellowship (NDSEG) program. We thank Dr. Christopher (Kit) Neel and Professor John Borg for stimulating discussions and help during the study.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0091
Air Force Research Laboratory (AFRL)UNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20200212-142725015
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Official Citation:Structure of shock waves in particulate composites. M. B. Rauls and G. Ravichandran. Journal of Applied Physics 127:6; doi: 10.1063/1.5125449
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101250
Deposited By: Tony Diaz
Deposited On:12 Feb 2020 22:45
Last Modified:12 Feb 2020 22:45

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