Analysis of axial resistance in penetration of rigid projectiles into power-law strain hardening plastic media
This study proposes a theoretical expression for the axial resistance throughout the entire process of pe-netration of rigid projectiles into power-law strain hardening media and conducts an analysis of influencing factors.By employing the theory of cylindrical cavity expansion and incorporating the head shape equations of conical and ogival projectiles,expressions for axial resistance and velocity variation of rigid projectiles penetrating semi-infinite thickness power-law strain hardening media and finite thickness target plates are derived.The critical velocity for projectile perforation of finite thickness target plates and formulas for residual velocity are provided,and the rationa-lity of the theoretical formulas is validated by comparison with experimental data.The analysis indicates that,for projectiles of the same size,ogival projectiles exhibit overall greater axial resistance compared to conical projectiles of the same head length;when the total length of the projectile remains constant,it is suggested that the ogive cali-ber radius head should be in the range of 3 to 6.
power-law strain hardening materialpenetration and perforationconical projectileogival projectileaxial resistance
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