J. Phys. IV France 10 (2000) Pr9-719-Pr9-727
Analysis of boundary conditions of super deep penetration processS. Usherenko1, J. Owsik2 and A. Zarwalska2
1 Research Institute Impulse Processes, 41 Platonov Str., 220071 Minsk, Belarus
2 Institute of Optoelectronics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland
When macrobodies undergo collision, macrocraters are formed for which the ratio of crater's depth to striker diameter does not exceed 10. At the end of the 70's, an anomalous effect of formation of microcraters of relative depth about 102-104 calibres has been detected. Analysis of the experimental results enabled to reveal existence of a narrow impact interaction zone within which craters-channels are produced with a good repeatability. Evidence of a limited relative depth under macroimpact is explained by restrictions imposed by energy intensity of impact interaction in a barrier material. Thus, production of anomalous channels-craters can be explained by modification of energy redistribution mechanism in a barrier material. Finally, the most important task of the study is determination of boundary conditions of a phenomenon of super deep penetration. The boundary conditions of super deep penetration are as follows : for velocity Vk < Vp <Ct (where Vp is the penetration velocity, Ct is the velocity of a transverse shock wave, Vk is the critical velocity of penetration), for the striker dimensions K ≤ dpmax ≤ Δh (where dpmax is the maximal striker dimension, Δh is the size of "amorphised" region, K is the size of elementary crystal cell of a barrier material).
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