Abstract
The ignition behavior and hotspot dynamics of a potential class of aluminized energetic materials are studied computationally. The materials consist of HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) grains embedded in an aluminum matrix and, henceforth referred to as metal-matrix explosives (MMXs). For the analysis, two different MMXs, the soft MMX with a matrix of 1100 Al alloy and the hard MMX with a matrix of 7075 T651 Al alloy are considered. The thermo-mechanical response of the MMXs are computationally analyzed by subjecting them to monotonic impact loading using a Lagrangian cohesive finite element framework, with their ignition behavior analyzed through characterization of hotspots. For comparison, a polymer-bonded explosive (PBX) consisting of HMX and Estane is also analyzed under the same conditions. The results show that the MMXs have significantly lower propensity for ignition and higher structural integrity than the PBX over the loading velocity range of 200-500 m s-1.
Original language | English |
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Article number | 085004 |
Journal | Modelling and Simulation in Materials Science and Engineering |
Volume | 26 |
Issue number | 8 |
DOIs | |
State | Published - Oct 24 2018 |
Funding
The authors gratefully acknowledge support from the Defense Threat Reduction Agency (DTRA) (Dr Allen Dalton) and the Air Force Office of Scientific Research (Dr Martin Schmidt). Calculations are carried out on parallel computers at DPRL at Georgia Tech and on supercomputers at MSRCs through the DoD HPCMP.
Keywords
- HMX
- PBX
- energetic material
- ignition
- impact
- metal-matrix explosives