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Debris Clouds Behind Double-Layer Targets

Splitterwolken hinter Zweischichtenzielen
 
: Stilp, A.J.; Weber, K.

:

International Journal of Impact Engineering 20 (1997), S.765-778
ISSN: 0734-743X
Englisch
Zeitschriftenaufsatz
Fraunhofer EMI ()
Aluminiumkugel-Projektil; aluminum sphere projectile; axiale Ausbreitungsgeschwindigkeit; back splash; cratering; debris cloud; debris cloud dispersion; Deutblech; double-layer target; expansion velocity; fragmentation; Fragmentierung; hole diameter; impedance mismatch; Impedanz-Fehlanpassung; Kraterbildung; laterale Ausbreitungsgeschwindigkeit; Lochdurchmesser; Lochdurchmesserzunahme; material distribution; Materialverteilung; Meteoriten-Schutzschild; meteroid bumper shield; phase transformation; Phasenumwandlung; shock impedance; shock impedance ratio; Splitterauswurf-Targetvorderseite; Splitterwolke; Stoßimpedanz; Stoßimpedanzverhältnis; Streuung; witness plate; Zweischichtziel

Abstract
It is demonstrated that the impedance mismatch and the order of the layers in two-layer sandwiches strongly influences the crater hole size formed in the target, the downrange debris cloud peak velocity, the fragment number and size, and the angles of downrange and uprange debris. Full and half scale test series with aluminum spheres of 10 mm and 5 mm diameter are performed with two-stage light gas guns against glued sandwiches of two layers about equal areal density and different as well as equal shock impedances in the velocity range of 3-8 km/s. In the case of the titanium/tungsten plate sequence the transmitted shock wave is much stronger than for the tungsten/titanium target. This leads to a higher degree of fragmentation of the participated materials. For titanium/tungsten the hole diameter formed in the titanium layer is distinctly larger than in the tungsten layer for tungsten/titanium. For the titanium /tungsten target the larger crater diameter on the impact side is in agreem ent with the lower maximum debris cloud velocity.

: http://publica.fraunhofer.de/dokumente/PX-9029.html