Abstract:

Probability of perforation (POP) curve is a constructive method to estimate the ballistic performance. It can be used to estimate the low velocity at smaller penetration probability. POP curves have potential and promising application in body armor design. For this purpose, the performance of UHMWPE unidirectional layers (PE armor) against 7.62mm type 51 pistol bullet was investigated. POP curves was established by logistic function and binary logistic regression. v50 (velocity with 50% penetration probability) and v05 (velocity with 5% penetration probability) of PE armor were derived from POP curves. v50 was 592m/s determined by both methods, while v05 was 538m/s and 514m/s，respectively. The results indicate that the regression method is more suitable for the estimation of velocity at low penetration probability. The difference between the two POP curves was discussed.

Key words: ordnance science and technology, probability of perforation curve, 7.62mm type 51 pistol bullet, PE armor, ballistic limited velocity