Quantification of probabilistic ignition thresholds of polymer-bonded explosives with microstructure defects

Wei, Yaochi; Kim, Seokpum; Horie, Yasuyuki; Zhou, Min

doi:10.1063/1.5031845

Quantification of probabilistic ignition thresholds of polymer-bonded explosives with microstructure defects

Journal Article · Mon Oct 29 00:00:00 EDT 2018 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5031845· OSTI ID:1564235

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

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

Microscopic defects such as voids and cracks in an energetic material significantly influence its shock sensitivity. Currently, there is a lack of systematic and quantitative study of the effects of cracks both experimentally and computationally, although significant work has been done on voids. We present an approach for quantifying the effects of intragranular and interfacial cracks in polymer-bonded explosives (PBXs) via mesoscale simulations that explicitly account for such defects. With this method, the ignition thresholds corresponding to any given level of ignition probability and, conversely, the ignition probability corresponding to any loading condition (i.e., ignition probability maps) are predicted for PBX 9404 containing different levels of initial grain cracking or interfacial debonding. James relations are utilized to express the predicted thresholds and ignition probabilities. It is found that defects lower the ignition thresholds and cause the material to be more sensitive. This effect of defects on shock sensitivity diminishes as the shock load intensity increases. Furthermore, the sensitivity differences are rooted in energy dissipation and the consequent hotspot development. The spatial preference in hotspot distribution is studied and quantified using a parameter called the defect preference ratio (r_pref). Analyses reveal that defects play an important role in the development of hotspots and thus have a strong influence on the ignition thresholds. The findings are in qualitative agreement with reported trends in experiments.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; Air Force Office of Scientific Research (AFOSR); Defense Threat Reduction Agency (DTRA)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1564235

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 16 Vol. 124; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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