Abstract: It is of great significance to study the damage power of reactive fragments which can withstand the loading of explosive. The damage effect of Al/PTFE composite structural reactive fragments on the different types of double-layer targets is studied through the loading experiment with 14.5 mm ballistic gun. The empiricial formulas of penetration diameter in front layer plate and expanding perforation area on rear layer plate were established using multiple regression analysis. The results show that the penetration diameter in front layer steel or aluminum plate increases with the rising of impact velocity and target thickness in the range of 800-1 400 m/s. The penetration diameters in the steel, aluminum and carbon fiber composite plates are 1.25-1.62 times, 1.08-1.42 times and 1.13 times of fragment diameter, respectively. Expanding and tearing damages are caused to the rear layer aluminum plate or the carbon fiber composite plate by the ractive fragments. The expanding perforation area increases with the increase in front layer target strength and impact velocity, and the delamination of carbon fiber and resin matrix for the back of carbon fiber composite plate should be considered in damage assessment. The empiricial formulas were proved to be accurate and reliable, and the relative error was controlled within 5% through experiment.

Key words: reactivefragment, penetrate, double-layertarget, damageeffect, expandingperforationarea