Hot-spot generation and growth in shocked plastic-bonded explosives studied by optical pyrometry

Bassett, Will P.; Johnson, Belinda P.; Salvati, Lawrence; Dlott, Dana D.

doi:10.1063/1.5098476

Title: Hot-spot generation and growth in shocked plastic-bonded explosives studied by optical pyrometry

Journal Article · 06 June 2019 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5098476 · OSTI ID:1545329

Bassett, Will P. ^[1]; Johnson, Belinda P. ^[1];

^[1];

^[1]

Univ. of Illinois, Urbana-Champaign, IL (United States)

The aggregate behavior of hot spots in shocked plastic-bonded explosives (PBX) was studied by nanosecond optical pyrometry. The averaged thermal emission spectra from at least 25 tiny (50 μg) explosive charges of a pentaerythritol tetranitrate PBX, at several impact velocities from 1.5 to 4.5 km/s, was used to determine average temperatures and emissivities. Individual spectra were analyzed to determine the distribution of hot spot temperatures in individual charges with unique microstructures. Understanding shocks in tiny charges with different microstructures is needed to understand shocks in large PBX charges which sample many microstructures as they propagate. The initial hot spot density was several percent, and the average initial hot spot temperature of 4000 K was, surprisingly, independent of impact velocity. With underdriven shocks, the initial hot spot temperatures clustered around 4000 K, but with overdriven shocks, there were both hotter and colder hot spots. The initial hot spot density increased quadratically with impact velocity. The generation of hot spots was described by a model with a threshold energy to trigger hot spot formation and a distribution of energetic barriers to hot spot formation.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1545329

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 21 Vol. 125; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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