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首页> 外文期刊>Composites: mechanics, computations, applications >CHARACTERISTIC FEATURES OF PROJECTILE FRAGMENTATION ON A MESH BUMPER AT HIGH-VELOCITY IMPACT
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CHARACTERISTIC FEATURES OF PROJECTILE FRAGMENTATION ON A MESH BUMPER AT HIGH-VELOCITY IMPACT

机译：高速撞击下网状冲击器上弹丸碎片的特征

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摘要

A high-velocity fragmentation of aluminum and polyethylene projectiles during their interaction with steel mesh bumpers was investigated experimentally and numerically. The projectile velocity in experiments amounted to about 3 km/s. The principal characteristic feature of the projectile destruction on mesh bumpers is the formation of jets of fragments ejected from the frontal part of the projectile in the direction of its motion and in lateral directions. The action of the jets on the witness plate (evaluated by the depths of the craters formed) can exceed the action of the remaining projectile mass. Numerical simulation yields the following estimate of the resulting cumulative effect: when a projectile is aimed at the cell center, the velocity of the frontal part of the jet exceeds the initial projectile velocity by about a factor of 1.5. The numerical simulation also allows one to explain the mechanism underlying the formation of experimentally observed groups of craters distributed linearly over the witness surface.
机译：通过实验和数值研究了铝和聚乙烯弹丸与钢制保险杠相互作用时的高速破碎。实验中的弹丸速度总计约为3 km / s。在网状保险杠上的弹丸破坏的主要特征是形成从弹丸的前部沿其运动方向和横向射出的碎片射流。射流在见证板上的作用（由形成的弹坑的深度评估）可以超过其余弹丸质量的作用。数值模拟对所得的累积效应进行了以下估算：当将射弹瞄准细胞中心时，射流额叶部分的速度超过初始射弹速度的1.5倍。数值模拟还可以解释在见证表面线性分布的实验观察到的陨石坑形成的机理。

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