Vol. 2, No. 9, 2007

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ISSN: 1559-3959
Shock-induced detonation of high explosives by high velocity impact

J. K. Chen, Hsu-Kuang Ching and Firooz A. Allahdadi

Vol. 2 (2007), No. 9, 1701–1721
Abstract

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
Milestones
Received: 4 October 2006
Accepted: 26 February 2007
Published: 1 November 2007
Authors
J. K. Chen
Department of Mechanical and Aerospace Engineering
University of Missouri
Columbia, Missouri
United States
Hsu-Kuang Ching
Department of Mechanical and Aerospace Engineering
University of Missouri
Columbia, Missouri
United States
Firooz A. Allahdadi
Air Force Safety Center
Kirtland AFB
New Mexico
United States