1 Introduction</h5> A large amount of laboratory tests had been conducted [1–4] to study the local effects of the impact of a hard projectile on a concrete target. Some variables affecting impact are related to projectile, such as projectile mass, diameter, nose shape and impact velocity. Other variables are related to concrete target, such as thickness, density, concrete compressive and tensile strength, strain rate effects on concrete strength and reinforcement ratio and details such as rebar diameter and spacing  .</P>When projectile strikes concrete target with certain velocity, one or more of the common seven modes of impact results [1,4,6] may occur, Fig. 1 .</P>The penetration depth is the distance x a projectile penetrates a target without resulting in perforation and scabbing. The scabbing limit h s is the target thickness that is just enough to prevent the scabbing, scabbing occurs when the target thickness H o < h s .</P>The perforation limit e is the minimum thickness of the target to prevent the perforation. The ballistic limit (perforation velocity) V p is the impact velocity at which the projectile perforates the target with zero exit velocity.</P>In plain concrete mainly the strength dominates its ability of resisting penetration,
International Journal of Impact Engineering – Elsevier
Published: Jan 1, 2014
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