SEARCH RESULT

This study investigates the some tribological behaviour of the steel tip surface of armor projectiles after ballistic impact.For this purpose many ballistic tests were performed with steel projectile tip on Metal Matrix Composites(MMCs) such as 5083, 6063 and 7075 aluminum alloys as matrix reinforced with SiC and Al2O3 particles. Terminal ballistic tests with AP 7.62 and 9 mm projectiles were performed on these composites. The mean velocities of AP 7.62 and 9 mm projectiles are 710-800 and 400 m/s, respectively. The distances between the armor and running position of the projectiles were 5 and 15 m for the 9 mm and AP 7.62 mm projectiles, respectively. It is observed that The projectile nose is broken or deformed plastically when it impacts the composite target. If the composite has hard reinforcement particles such as Al2O3, the friction between projectile tip and hole surface becomes greater and the projectile surface is scratched by ploughing. Plastic damage or breaking of the tip nose leads to increasing the resistance to the projectile movement through the target hole. The predominant wear mechanism of the tip surface is abrasion. Microcutting and plastic yielding as bulging are also observed on the tip surface as wear mechanisms. Deep valleys on the tip nose and deep grooves on the main surface of the projectile tip are also observed. This shows that a the composite manufactured from Al and Al2O3 has good ballistic performance against AK-47 (7.62mm×39mm Armour Piercing) and G3 (7.62mm×51mm Armour Piercing) projectiles.

International Iron & Steel Symposium
UDCS

Mehmet Baki KARAMIŞ