论文部分内容阅读
For light metal structures, a lightweight polymer surface layer can enhance protection against perforation by impacting projectiles.The effectiveness of this layer depends on the strength of the polymer as well as the shape of the impacting body.Penetration and perforation experiments have been performed using a gas gun to propel projectiles against clamped plates where impact and post-perforation speeds have been measured together with the residual deflections of the plate.For most nose shapes the effectiveness of a polymer coating is not much different from that of an equivalent mass of metal; however, for blunt projectiles, the polymer coating can substantially increase the ballistic limit velocity in comparison with that of an equivalent mass of metal.This result will be explained in relation to deformation and failure modes for the plate.