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Streamline reversal in hypervelocity penetration

โœ Scribed by Dennis L. Orphal; Charles E. Anderson Jr.

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
1014 KB
Volume
23
Category
Article
ISSN
0734-743X

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โœฆ Synopsis

We report a direct observation of the "streamline" reversal of eroded rod material proposed by Allen and Rogers in 196 1 [ 11. Allen and Rogers suggested that the "turning" of highvelocity long-rod penetrator material at the target interface could be viewed as a reversal of the direction of a "streamline" with only a change of sign in the velocity. Allen and Rogers' streamline reversal model has two important consequences. First, the eroded debris has a speed of v,, = 2u -v relative to the target, where v is the impact velocity and u is the speed of penetration of the rod relative to the target. Secondly, a consequence of v,, = 2u -v is that the length of the rod debris, 0,. is given by the difference in the initial length of the rod, P,, and the remaining length of the rod, P, i.e., Qd = P, -I?. Results of a time-resolved experiment for a tungsten penetrator into a polycarbonate target at 3.61 km/s and a corresponding numerical simulation are consistent with streamline reversal. Numerical simulations are then used in a parametric study to investigate the effects of various density ratios between penetrator and target materials.

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