Fragmentation of metal particles during heterogeneous explosion

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Authors
  1. Ripley, R.C.
  2. Donahue, L.
  3. Zhang, F.
Corporate Authors
Defence Research and Development Canada, Suffield Research Centre, Ralston AB (CAN)
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 semiconfined urban street. Comparison with experimental records of pressure shows good agreement despite challenges inherent in the complexity of heterogeneous blast measurement and multiphase simulation.
Keywords
Multiphase Blast;Particle Fragemntation
Report Number
DRDC-RDDC-2015-P207 — External Literature
Date of publication
17 May 2017
Number of Pages
17
DSTKIM No
CA044866
CANDIS No
805240
Format(s):
Electronic Document(PDF)

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