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Long-Rod Penetration into Target That Was Previously Penetrated

Penetration eines Stabes in ein vorgeschädigtes Ziel
: Hohler, V.; Stilp, A.J.; Mayseless, M.

16th International Symposium on Ballistics 1996. Proceedings
San Francisco, 1996
International Symposium on Ballistics <16, 1996, San Francisco/Calif.>
Conference Paper
Fraunhofer EMI ()
impact experiments; Impaktexperiment; numerical simulation; numerische Simulation; penetration; pre-damaged target; rod projectile; Stabprojectil; vorgeschädigtes Ziel

Target efficiency is normally defined and tested regardless of previous hits which may have damaged an area close to the new impact point. New, advanced armor can defeat the first hit but the damage may affect targets' ability to stop a second shot. The study presented here is a first attempt to examine the change in target efficiency due to such a damage. It is well known that the penetration depth of a long rod depends on the boundary conditions of the target penetrated. Experimental findings have shown that the damaged zone is small, and only hits which are closer than approximately three projectile diameters are affected. The radius of curvature of the first crater has no significant effect on the decrease in efficiency. The efficiency is not proportional to the length of the first crater, and it is affected mainly during the last stages of penetration. It seems that the plastic deformation which may exist around the first crater and the debris which remain in the target may compen sate the free boundary effect, but this subject requires further research to confirm.