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The failure kinetics of high density DEDF glass against rod impact at velocities from 0.4 to 2.5 km/s

 
: Behner, T.; Anderson, C.E.; Orphal, D.L.; Hohler, V.; Moll, M.; Templeton, D.W.

Flis, W.J. ; National Defense Industrial Association -NDIA-; International Ballistics Committee -IBC-:
Ballistics 2005, 22nd International Symposium on Ballistics. Vol.2: Terminal Ballistics and Vulnerability, Lethality and Wound Ballistics : 14-18 November 2005, Vancouver, Canada
Lancaster, Pa.: DEStech Publications, 2005
ISBN: 1-932078-52-5
ISBN: 978-1-932078-52-7
S.877-884
International Symposium on Ballistics <22, 2005, Vancouver>
Englisch
Konferenzbeitrag
Fraunhofer EMI ()

Abstract
The failure wave phenomenon has been investigated for gold rod impact on high density (DEDF) glass by visualizing simultaneously the failure propagation in the glass with a high-speed camera and the rod penetration with flash radiography. At a given impact velocity, the failure wave velocity is significantly higher during early penetration than during steady-state penetration of the rod. This behavior is caused by the fact that the impact pressure is several times greater than the hydrodynamic pressure. The ratio of average failure wave velocity to penetration velocity of the rod decreases with impact velocity in the considered range of 0.4 to 2.5 km/s. As a consequence, the comminution in front of the rod tip is reduced more and more and the Tate term R increases with impact velocity. For equal pressures, the failure wave velocities determined from Taylor tests or planar-impact tests are greater than those observed during steady-state rod penetration.

: http://publica.fraunhofer.de/dokumente/N-49705.html