Abstract: Penetration process of projectile penetration high strength concrete target with different penetrating angles is captured in the light gas gun by using the high-speed photography. And the motion feature of projectile affected by the penetrating angle and penetrating velocity is analyzed. The result shows that projectile has a horizontal movement as the striking angle is 0 degree, while it deflected after 150-200 μs as the striking angle of target more than 0 degree and the projectile in a lower penetration velocity around 200 m/s. There is a positive correlation between the level penetrating velocity, deflection angle and its time. The penetrating time of projectile in horizontal movement and the spatter velocity decreased mainly affected by the decrease of penetrating velocity of projectile at a certain penetrating angle. The influence of penetrating angle on spatter velocity and projectile horizontal penetration time is relatively larger than that of the penetrating velocity of projectile. It is proved that the size of penetrating angle is important and unavoidable in security protection fornications.

Key words: projectile, penetrating velocity, penetration, high-speed photography, motion feature