Temperature-based reactive flow model for TATB plastic bonded explosives

Journal Article · Sun Jul 30 04:00:00 EDT 2023 · Journal of Applied Physics

OSTI ID:2315083

Christenson, Joel G. ^[1]; Kroonblawd, Matthew P. ^[1]; Bastea, Sorin ^[1]; Weerakkody, Emily N. ^[1]; Vandersall, Kevin S. ^[1]; Fried, Laurence E. ^[1]

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1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

A new reactive flow model is presented for TATB-based plastic bonded explosives, applicable to shock initiation and detonation problems of differing initial temperature. Temperature disequilibrium is assumed between unreacted explosive, material in the vicinity of compressed defects (called hot spots), and detonation products. The model incorporates temperature-dependent decomposition reaction rates. Arrhenius model parameters were derived from subscale quantum-based molecular dynamics simulations of shock-induced TATB decomposition. Further, a model of detonation carbon aggregation is incorporated, describing the late-time slow release of energy inherent to detonation in TATB-based materials. The predictive ability of the model in the shock initiation regime is tested against recent thin pulse experiments on PBX 9502. Here, the model is found to perform equally well in predicting the size effect curve of ambient, cold, and hot PBX 9502 rate sticks.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-07NA27344
• OSTI ID: 2315083
• Report Number(s): LLNL--JRNL-853395; 1079897
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics; ISSN 1079897
• Country of Publication: United States
• Language: English

Related Subjects

Chemistry - Chemical explosives