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Shock-induced
detonation of high explosives by high velocity impact
J. K. Chen, Hsu-Kuang Ching and Firooz A. Allahdadi |
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Vol. 2 (2007), No. 9, 1701–1721
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Abstract |
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We investigate shock-induced detonation of high explosives confined in an open-ended steel cylinder by a normal impact to the cylindrical surface using three-dimensional finite element analysis. Three types of steel projectiles are considered: a cube, a sphere and a square plate. For the encased LX-17 explosive the calculated threshold impact velocities that lead to deflagration and detonation are higher for a sphere than for a cube of the same mass. It is found that detonation of the encased PBXN-110 explosive with the cubical projectile could occur immediately once a full reaction is initiated in the region near the impact site. The threshold detonation velocity is much lower for PBXN-110 than for LX-17. In addition, we discuss the threshold conditions of detonation predicted by different equations of state and failure models for the steel casing and projectile. |
Keywords
explosive detonation, high velocity impact, Lee–Tarver
ignition and growth model, Jones–Wilkins–Lee equation of
state, Johnson–Cook model, finite element analysis
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Milestones
Received: 4 October 2006
Accepted: 26 February 2007
Published: 1 November 2007
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Authors |
| J. K. Chen | |
| Department of Mechanical and
Aerospace Engineering University of Missouri Columbia, Missouri United States |
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| Hsu-Kuang Ching | |
| Department of Mechanical and
Aerospace Engineering University of Missouri Columbia, Missouri United States |
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| Firooz A. Allahdadi | |
| Air Force Safety Center Kirtland AFB New Mexico United States |
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