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Title: Cookoff of Powdered and Pressed Explosives using a Micromechanics Pressurization Model

Journal Article · · Propellants, Explosives, Pyrotechnics

Cookoff experiments of powdered and pressed TATB-based plastic bonded explosives (PBXs) have been modeled using a pressure-dependent universal cookoff model (UCM) in combination with a micromechanics pressurization (MMP) model described in a companion paper. The MMP model is based on the accumulation of decomposition gases at nucleation sites that load the surrounding TATB crystals and binder. This is the first cookoff model to use an analytical mechanics solution for compressibility and thermal expansion to describe internal pressurization caused by both temperature and decomposition occurring within closed-pore explosives. This approach produces more accurate predictions of ignition time and pressurization within high-density explosives than simple equation-of-state models. The current paper gives details of the reaction chemistry, model parameters, predicted uncertainty, and validation using experiments from multiple laboratories with errors less than 6 %. The UCM/MMP model framework gives more accurate thermal ignition predictions for high density explosives that are initially impermeable to decomposition gases.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003525
OSTI ID:
1830528
Alternate ID(s):
OSTI ID: 1830249; OSTI ID: 1834105
Report Number(s):
SAND--2021-14091J; 701485
Journal Information:
Propellants, Explosives, Pyrotechnics, Journal Name: Propellants, Explosives, Pyrotechnics Journal Issue: 2 Vol. 47; ISSN 0721-3115
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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