Effects of Impact Angles on Ballistic Limit of Ultra-High-Molecular-Weight Polyethylene Fiber Fabrics

抄録

We examined the effects of impact angle on the penetration depth and hole size of two kinds of ultra-high molecular weight polyethylene fiber fabrics when spherical projectiles with a diameter of 1 mm made of aluminum alloy 2017-T4 obliquely struck the fiber fabrics. Impact velocities were 2 km/s and 5 km/s. In the case of fiber fabrics with high fabric density, the absorbed energy per penetration depth at the impact angle of 45 deg. was greater than that at the impact angle of 0 deg. On the other hand, the absorbed energy per penetration depth of fiber fabrics with low fabric density at the impact angles of 30 deg. and 45 deg. was smaller than that at the impact angle of 0 deg. The impact angle clearly affected the hole size of projectile penetration and its tendency. The penetration mechanism was also discussed.