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Fragmentation of metal particles during heterogeneous explosion

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Abstract

Heterogeneous explosives contain a mixture of standard explosive material and reactive metal particles. The inclusion of metal particles alters the energy density and energy release timescales involved in the blast event. Available experimental evidence indicates that metal particles may be damaged or fragmented during heterogeneous blast, altering the distribution of particle sizes from their initial state. This paper discusses adaptation and application of fragmentation theory and physical models for particle damage during condensed matter detonation, aerodynamic breakup of molten particles, and particle impact fragmentation with nearby structures. The shock compression and impact fragmentation models are based on the energy methods for dynamic fragmentation by Grady and Kipp, while aerodynamic breakup is treated according to Weber number stability criteria for droplets. These particle fragmentation models are validated against fundamental test cases from the literature. The models are then applied to heterogeneous blast scenarios including free field and wall reflection in a semi-confined urban street. Comparison with experimental records of pressure shows good agreement despite challenges inherent in the complexity of heterogeneous blast measurement and multiphase simulation.

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Acknowledgments

The authors greatly appreciate the contributions of J. Leadbetter.

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Authors and Affiliations

  1. Martec Limited, 1888 Brunswick St., Suite 400, Halifax, NS, B3J 3J8, Canada

    R. C. Ripley & L. Donahue

  2. Defence Research and Development Canada, Station Main, PO Box 4000, Medicine Hat, AB, T1A 8K6, Canada

    F. Zhang

Authors
  1. R. C. Ripley
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  2. L. Donahue
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  3. F. Zhang
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Corresponding author

Correspondence to R. C. Ripley.

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Communicated by L. Bauwens.

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Ripley, R.C., Donahue, L. & Zhang, F. Fragmentation of metal particles during heterogeneous explosion. Shock Waves 25, 151–167 (2015). https://doi.org/10.1007/s00193-015-0552-9

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