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High Obliquity Impact of Soft and Hard Spheres on Thin Plates

Hochgeschwindigkeitsaufprall von weichen und harten Kugeln auf dünne Platten
 
: Kivity, Y.; Mayseless, M.; Luttwak, G.; Stilp, A.J.; Hohler, V.; Weber, K.; Florie, C.; Lenselink, H.; Cowler, M.; Birnbaum, N.

Mayseless, M. (ed.); Bodener, S.R.:
Ballistics '95. 15th International Symposium. Proceedings. Vol. 1: Terminal Ballistics
Tel Aviv, 1995
ISBN: 0-9618156-0-4
International Symposium on Ballistics <15, 1995, Jerusalem>
Englisch
Konferenzbeitrag
Fraunhofer EMI ()
angle of obliquity; armco iron spheres; Auftreffgeschwindigkeit; AUTODYN code; Beulenhöhe; bulge height; DYTRAN code; effectivce plastic strain; effektive plastische Dehnung; effektive Plattendicke; eroding Lagrange method; flash X-ray photographs; fragmentation; Fragmentierung; gehärtete Stahlkugeln; geometric erosion strain; hard steel spheres; Lagrange solver; line-of-sight; multi-materal Euler method; multi-material Euler/ALE solver; numerical simulations; numerische Simulation; oblique impact experiments; Panzerstahl; projectile shape; Projektilform; Ricochet; ricocheting phenomenon; rolled homogeneous armor; Röntgenblitzaufnahmen; Rückprall; schräger Impakt; soft iron spheres; Stahlkugelaufprall; steel sphere impact; striking velocity; Targetneigungswinkel; von-Mises-Fließbedingungen; von-Mises yield condition; Weicheisenkugeln

Abstract
This paper presents a combined experimental-computational study of the impact of steel spheres on thin armor plates at an oblique angle of 70 deg. The plates were nominally 6 mm thick, rolled homogeneous armor. Two types of spheres were used, a hard steel and a soft iron. In all cases the velocity was around 1500 m/s. This combination of velocity and materials resulted in plate perforation for the hard spheres, whereas for the soft spheres the plates were not perforated. The impact process was radiographed at 5µs intervals and the plates were cut to allow an examination of their cross-section. The simulations were carried out with two hydrocodes: the DYTRAN code, employing an Euler solver, and the AUTODYN code, using an eroding Lagrange solver. The results of the simulation agree quite well with the experimental material contours obtained from radiographs, and with the final crater shapes.

: http://publica.fraunhofer.de/dokumente/PX-17085.html