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Ignition Desensitization of PBX via Aluminization

  • Symposium: Dynamic Behavior of Materials VI
  • Published:
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Abstract

The ignition behavior of aluminized HMX/Estane PBX under impact loading is analyzed through meso-scale simulations which account for constituent elasticity, viscoelasticity, elasto-viscoplasticity, fracture, internal contact, frictional heating, and heat conduction. The analyses involve explicit tracking of hotspot development and focuses on the probability of ignition, accounting for stochastic variations in microstructures which have HMX grain sizes ranging from 50 to 400 μm, binder-grain bonding strength of 35 MPa, and binder-grain interface bonding energy on the order of 81 J/m2. For the microstructure configuration studied, it is found that aluminization with particles 50 μm in diameter delays the initiation of chemical reaction in the material. The mean time to ignition (t 50) for cases with 6 to 18 pct Al by volume is 1 to 1.7 μs longer (24 to 60 pct delay) as compared to that for the corresponding unaluminized PBX. To understand the mechanisms leading to the ignition delay, the differences in overall internal stresses, dissipations due to fracture and inelasticity, and hotspot field characteristics are quantified.

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Acknowledgments

The authors gratefully acknowledge support from the Defense Threat Reduction Agency (DTRA) and Air Force Research Laboratory (AFRL) at the Eglin AFB (DISTRIBUTION A. Public release, distribution unlimited. 96ABW-2014-0122). Calculations are carried out on parallel computers at DPRL at Georgia Tech.

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Authors and Affiliations

  1. The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30318, USA

    Seokpum Kim & Min Zhou

  2. Munitions Directorate, Air Force Research Lab, Eglin AFB, FL, 32542, USA

    Yasuyuki Horie

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  1. Seokpum Kim
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  2. Yasuyuki Horie
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  3. Min Zhou
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Correspondence to Min Zhou.

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Manuscript submitted on April 13, 2014.

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Kim, S., Horie, Y. & Zhou, M. Ignition Desensitization of PBX via Aluminization. Metall Mater Trans A 46, 4578–4586 (2015). https://doi.org/10.1007/s11661-014-2605-6

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  • DOI: https://doi.org/10.1007/s11661-014-2605-6

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