Ignition Desensitization of PBX via Aluminization

Seokpum Kim; Yasuyuki Horie; Min Zhou

doi:10.1007/s11661-014-2605-6

Ignition Desensitization of PBX via Aluminization

Seokpum Kim, Yasuyuki Horie, Min Zhou

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The ignition behavior of aluminized HMX/Estane PBX under impact loading is analyzed through meso-scale simulations which account for constituent elasticity, viscoelasticity, elasto-viscoplasticity, fracture, internal contact, frictional heating, and heat conduction. The analyses involve explicit tracking of hotspot development and focuses on the probability of ignition, accounting for stochastic variations in microstructures which have HMX grain sizes ranging from 50 to 400 μm, binder-grain bonding strength of 35 MPa, and binder-grain interface bonding energy on the order of 81 J/m². For the microstructure configuration studied, it is found that aluminization with particles 50 μm in diameter delays the initiation of chemical reaction in the material. The mean time to ignition (t₅₀) for cases with 6 to 18 pct Al by volume is 1 to 1.7 μs longer (24 to 60 pct delay) as compared to that for the corresponding unaluminized PBX. To understand the mechanisms leading to the ignition delay, the differences in overall internal stresses, dissipations due to fracture and inelasticity, and hotspot field characteristics are quantified.

Original language	English
Pages (from-to)	4578-4586
Number of pages	9
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	46
Issue number	10
DOIs	https://doi.org/10.1007/s11661-014-2605-6
State	Published - Oct 2 2015
Externally published	Yes

Funding

The authors gratefully acknowledge support from the Defense Threat Reduction Agency (DTRA) and Air Force Research Laboratory (AFRL) at the Eglin AFB (DISTRIBUTION A. Public release, distribution unlimited. 96ABW-2014-0122). Calculations are carried out on parallel computers at DPRL at Georgia Tech.

Funders	Funder number
Air Force Research Laboratory
Defense Threat Reduction Agency
Defense Threat Reduction Agency
Air Force Research Laboratory	96ABW-2014-0122

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title = "Ignition Desensitization of PBX via Aluminization",

abstract = "The ignition behavior of aluminized HMX/Estane PBX under impact loading is analyzed through meso-scale simulations which account for constituent elasticity, viscoelasticity, elasto-viscoplasticity, fracture, internal contact, frictional heating, and heat conduction. The analyses involve explicit tracking of hotspot development and focuses on the probability of ignition, accounting for stochastic variations in microstructures which have HMX grain sizes ranging from 50 to 400 μm, binder-grain bonding strength of 35 MPa, and binder-grain interface bonding energy on the order of 81 J/m2. For the microstructure configuration studied, it is found that aluminization with particles 50 μm in diameter delays the initiation of chemical reaction in the material. The mean time to ignition (t50) for cases with 6 to 18 pct Al by volume is 1 to 1.7 μs longer (24 to 60 pct delay) as compared to that for the corresponding unaluminized PBX. To understand the mechanisms leading to the ignition delay, the differences in overall internal stresses, dissipations due to fracture and inelasticity, and hotspot field characteristics are quantified.",

author = "Seokpum Kim and Yasuyuki Horie and Min Zhou",

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AU - Kim, Seokpum

AU - Horie, Yasuyuki

AU - Zhou, Min

PY - 2015/10/2

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N2 - The ignition behavior of aluminized HMX/Estane PBX under impact loading is analyzed through meso-scale simulations which account for constituent elasticity, viscoelasticity, elasto-viscoplasticity, fracture, internal contact, frictional heating, and heat conduction. The analyses involve explicit tracking of hotspot development and focuses on the probability of ignition, accounting for stochastic variations in microstructures which have HMX grain sizes ranging from 50 to 400 μm, binder-grain bonding strength of 35 MPa, and binder-grain interface bonding energy on the order of 81 J/m2. For the microstructure configuration studied, it is found that aluminization with particles 50 μm in diameter delays the initiation of chemical reaction in the material. The mean time to ignition (t50) for cases with 6 to 18 pct Al by volume is 1 to 1.7 μs longer (24 to 60 pct delay) as compared to that for the corresponding unaluminized PBX. To understand the mechanisms leading to the ignition delay, the differences in overall internal stresses, dissipations due to fracture and inelasticity, and hotspot field characteristics are quantified.

AB - The ignition behavior of aluminized HMX/Estane PBX under impact loading is analyzed through meso-scale simulations which account for constituent elasticity, viscoelasticity, elasto-viscoplasticity, fracture, internal contact, frictional heating, and heat conduction. The analyses involve explicit tracking of hotspot development and focuses on the probability of ignition, accounting for stochastic variations in microstructures which have HMX grain sizes ranging from 50 to 400 μm, binder-grain bonding strength of 35 MPa, and binder-grain interface bonding energy on the order of 81 J/m2. For the microstructure configuration studied, it is found that aluminization with particles 50 μm in diameter delays the initiation of chemical reaction in the material. The mean time to ignition (t50) for cases with 6 to 18 pct Al by volume is 1 to 1.7 μs longer (24 to 60 pct delay) as compared to that for the corresponding unaluminized PBX. To understand the mechanisms leading to the ignition delay, the differences in overall internal stresses, dissipations due to fracture and inelasticity, and hotspot field characteristics are quantified.

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JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

IS - 10

ER -

Ignition Desensitization of PBX via Aluminization

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