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The Fragmentation of Al-W Granular Composites Under Explosive Loading

Published online by Cambridge University Press:  01 February 2013

Karl L. Olney ,
Po-Hsun Chiu ,
Vitali F. Nesterenko ,
David J. Benson ,
Chris Braithwaite ,
Adam Collins ,
David Williamson  and
Francesca McKenzie
Karl L. Olney
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, San Diego, San Diego, California, USA
Po-Hsun Chiu
Affiliation:
Material Science and Engineering program, University of California, San Diego, San Diego, California, USA
Vitali F. Nesterenko
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, San Diego, San Diego, California, USA Material Science and Engineering program, University of California, San Diego, San Diego, California, USA
David J. Benson
Affiliation:
Department of Structural Engineering, University of California, San Diego, San Diego, California, USA
Chris Braithwaite
Affiliation:
Fracture and Shock Physics, SMF Group, Department of Physics, Cavendish Laboratory, Cambridge, CB3 0HE, United Kingdom
Adam Collins
Affiliation:
Fracture and Shock Physics, SMF Group, Department of Physics, Cavendish Laboratory, Cambridge, CB3 0HE, United Kingdom
David Williamson
Affiliation:
Fracture and Shock Physics, SMF Group, Department of Physics, Cavendish Laboratory, Cambridge, CB3 0HE, United Kingdom
Francesca McKenzie
Affiliation:
Institute of Shock Physics, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom
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Abstract

Small scale explosively driven fragmentation experiments have been performed on Aluminum (Al)-Tungsten (W) granular composite rings processed using cold isostatic compression of Al and W powders with a particle size of 4-30 microns. Fragments collected from the experiments had a maximum size of the order of a few hundred micrometers. This is a dramatic reduction in the fragment size when compared to the 1-10 mm typical for a homogeneous material such as solid aluminum under similar loading conditions. Numerical simulations of the experiment were performed to elucidate the mechanisms of fragmentation that were responsible for this shift in fragmentation size scales. Simulations were performed with a significantly stronger explosive driver to examine how the mechanisms of fragmentation change when the detonation pressure increases.

Keywords

energetic materialsimulationshock loading
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1521: Symposium OO – Properties, Processing and Applications of Reactive Materials , 2013 , mrsf12-1521-oo08-07
Copyright
Copyright © Materials Research Society 2013

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References

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