头部非对称刻槽弹体侵彻混凝土目标性能研究

为进一步提高弹体对混凝土类脆性靶体的破坏能力，提出一种可对混凝土施加轴线压缩与切向剪切联合破坏作用的头部非对称刻槽弹体，并在极坐标下表征非圆截面头部弹体结构。利用准静态柱形空腔膨胀模型，建立轴向压缩-切向剪切联合作用下的准静态柱形空腔膨胀理论模型，推导得到考虑剪切效应的靶体响应力函数。在此基础上，发展了头部非对称刻槽弹体侵彻半无限厚混凝土目标局部相互作用模型。基于前述分析，开展了头部非对称刻槽弹体侵彻半无限混凝土目标系列试验研究。研究结果表明：考虑剪切效应的二维空腔膨胀理论及局部相互作用模型的理论计算结果与试验结果吻合较好；与普通尖卵形弹体相比较，头部非对称刻槽弹体具有较好的侵彻能力，能有效提高侵彻深度。

Research on Penetration of Asymmetrically Grooved Nose Projectile into Concrete Target

A projectile with asymmetrically grooved nose is proposed to further improve the penetration performance of projectile into concrete target. The projectile penetrates into target with passive rotation during the penetration. The asymmetrically grooved nose projectile is geometrically characterized under the polar coordinates. An extended quasi-static cylindrical cavity expansion model with tangential shear effect is constructed to estimate the normal stress on the surface of asymmetrically grooved-nose projectile by the quasi-static cylindrical cavity expansion model. The localized interaction models (LIMs) for the ultimate depth of penetration (DOP) of asymmetrically grooved nose projectile are derived based on the predicted normal stress. Comparative experiments of the asymmetrically grooved nose projectile and the ogive- nose projectile penetrating into semi-infinite concrete target are conducted. The analysis results prove that the LIM with extended quasi-static cylindrical cavity expansion model has a preferable estimating accuracy and is suitable for prediction of DOP of asymmetric groove-nose projectile. Compared with ogive-nose projectile, the asymmetrically grooved nose projectile has a better penetration performance.