Ignition thresholds of aluminized HMX-based polymer-bonded explosives

Miller, Christopher; Kim, Seokpum; Horie, Yasuyuki; Zhou, Min

doi:10.1063/1.5052632

Ignition thresholds of aluminized HMX-based polymer-bonded explosives

Journal Article · Tue Apr 02 00:00:00 EDT 2019 · AIP Advances

DOI:https://doi.org/10.1063/1.5052632· OSTI ID:1558557

^[1]; ^[2]; Horie, Yasuyuki ^[3]; Zhou, Min ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Air Force Research Lab, Eglin AFB, FL (United States)

Here, the ignition of aluminized HMX-based polymer-bonded explosives (PBXs) under shock loading is studied via mesoscale simulations. The conditions analyzed concern loading pulses of 20 nanoseconds to 0.8 microseconds in duration and impact piston velocities on the order of 400-1000 m/s or loading stresses on the order of 3-14 GPa. The sets of samples studied have stochastically similar microstructures consisting of a bimodal distribution of HMX grains, an Estane binder, and aluminum particles 50-100 µm in diameter. The computational model accounts for constituent elasto-viscoplasticity, viscoelasticity, bulk compressibility, fracture, interfacial debonding, internal contact, bulk and frictional heating, and heat conduction. The analysis focuses on the development of hotspots under different material settings and loading conditions. In particular, the ignition thresholds in the forms of the James relation and the Walker-Wasley relation and the corresponding ignition probability are calculated and expressed as functions of the aluminum volume fraction for the PBXs analyzed. Lastly, it is found that the addition of aluminum raises the ignition thresholds, causing the materials to be less sensitive. Dissipation and heating mechanism changes responsible for this trend are delineated.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725; NA0003864

OSTI ID:: 1558557

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 4 Vol. 9; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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