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Subscale penetration tests with bombs and advanced penetrators against hardened structures

Modell-Penetrationsversuche mit Bomben und modernen Penetratoren gegen gehärtete Schutzbauten
: Langheim, H.; Pahl, H.; Schmolinske, E.; Stilp, A.J.

6th International Symposium on Interaction of Nonnuclear Munitions with Structures 1993. Proceedings
Panama City Beach, 1993
International Symposium on Interaction of Nonnuclear Munitions with Structures <6, 1993, Panama City Beach/Fla.>
Fraunhofer EMI ()
Anstellwinkel; Auftreffgeschwindigkeit; Auslegung; Beton; bomb; Bombe; burster layer; concrete; design; Endballistik; Felsbrocken; Gehärtete Schutzbauten; geschichtetes Ziel; hard target penetrator; hardened shelters; impact velocity; KE-Penetratoren; layered structure; Modellversuch; penetrator; protection level; rock rubble level; Schutzwirkung; subscale tests; terminal ballistics; yaw angle; Zerschellerschichten

Modern weapons with increased terminal velocities, high strength cases and with high length/diameter ratios delivered with pinpoint accuracy force the structural engineer to provide a structure with a higher level of protection. The current database for design is inadequate. Other data derived from model tests can therefore help. Model tests allow variations of parameters with regard to both potential threat and protective measures at affordable costs and time. This paper describes the results of model tests carried out at the Ernst-Mach-Institut, where generic model bombs were fired against sections of a scaled protective structure. The sections consisted of a layer of grouted rock boulders which were backed by a reinforced concrete slab. The gap between the roof slab and the above-mentioned backing slab was filled with either asphalt or ashes. A scaled German WW II Armour Piercing Bomb PD 500 was chosen. The inert bombs struck the target at right angles to the surface in the high ve locity range of 400 m/s and 500 m/s. The penetration behaviour of the weapon is strongly dependent upon the yaw angle of the bomb. If a bomb strikes with a yaw angle, the penetration depth in the grouted rock rubble layer will be approximately twice the caliber. During the penetration process the bomb deflected and the casing underwent Euler buckling. Without the yaw the bomb perforated the rock rubble layer and penetrated into the reinforced slab. In all tests the backing slabs were practically undamaged and only small cracks could be observed. From the results it can be concluded that a grouted rock boulder layer backed by a reinforced concrete slab offers a high level of protection against the effects of Armor Piercing bombs. Tests with hard target penetrators against the same protective structure at velocities of 740 m/s resulted in penetration failure in the rock rubble layer.