弹体侵彻混凝土侧壁摩擦阻力研究

基于混凝土材料的动态球形空腔膨胀理论,建立了头部和侧壁分别具有不同摩擦系数的动能弹侵彻阻力模型,探讨了侧壁摩擦阻力对侵彻深度、过载曲线的影响以及不同初速度下侵彻阻力的构成.结果显示:对于CRH为3、长径比为7的卵形弹体侵彻45MPa混凝土,当弹体初速度介于800～1 300m/s时,忽略侧壁摩擦将会给侵深带来至少10%的误差;在侵彻过程中,侧壁阻力在总阻力中的比例一直在增大,侵彻结束瞬间达到最大;同时,在此速度范围内,侵彻阻力中的靶体惯性项不可忽略;当弹体初速度低于400m/s时,摩擦阻力和靶体惯性阻力对侵深的影响均可忽略.

Study on the Behavior of Projectile Shank Friction Penetrating into Concrete

A resistance model for the kinetic energy penetrator with two different friction coefficients on its nose and shank respectively is presented based on the dynamic spherical cavity-expansion theory of the concrete materials. The effects of the shank friction on the depth of penetration and acceleration curve were investigated, and the composition of the penetration resistance under different striking velocities was investigated too. The results show that, for the ogive-nose projectile with CRH of 3 and length-diameter ratio of 7 penetrating into the 45 MPa concrete, when the initial velocity is in the range of 800~1 300 m/s, an error of at least 10% on the penetration depth would occur if the shank friction is neglected. During the penetration process, the proportion of the shank friction in the total resistance is increasing all the time. Meanwhile, the target inertial term of the penetration resistance can't be neglected anymore at this velocity range. When the initial velocity of the projectile is less than 400 m/s, the effects of both the friction and target inertial term on the depth of penetration can be neglected.