ESTIMATE OF PENETRATION/PERFORATION PERFORMANCE BASED ON SEMI-INFINITE PENETRATION DATA

摘要

The database for depth of penetration by projectiles into semi-infinite targets is quiteextensive. The objective is to use the experimental semi-infinite penetration data to predictfinite-thickness target effects, such as the ballistic limit thickness T50 and/or the ballisticlimit velocity, V50, and the residual velocity. A regression analysis is used to provide ananalytic expression for the depth of penetration normalized by the original projectile length,P/L, as a function of impact velocity V over a very large velocity range, typically a fewhundred meters per second to over 3000 m/s. We use this expression, along with somesimplifying assumptions, to estimate T50 or V50. If a target is overmatched, i.e., perforatedby the projectile, an estimate is also made for the residual velocity. The experimental dataon which the regression fit is based consists of L/D 10 projectiles, so a procedure isdeveloped to account for different projectile aspect ratios. A series of examples areprovided to demonstrate the accuracy of the approach.