卵形弹体侵彻混凝土开坑区侵彻阻力计算

为了研究弹体开坑过程中，弹头表面应力的表达形式，采用高速摄影仪记录弹体在开坑区的位移和时间关系，得到卵形弹体在开坑区的速度和侵深关系。采用最小二乘法对开坑区结束时消耗的弹体动能和侵深关系进行分析，提出开坑过程中弹头表面的应力形式。计算结果表明，该应力形式能较好地描述高速条件下开坑区的侵深和速度关系。

A calculation of penetration resistance during cratering for ogive-nose projectile into concrete

Penetration experiments were conducted to explore an expression formula for the stress endured by the nose of the projectile during cratering.To obtain the relation between penetration velocity and penetration depth, the relation between penetration depth and time was recorded by using a high-speed camera.And the least square method was used to analyze the relation of the kinetic energy consumed by the projectile with the penetration depth at the end of cratering.Thereby, an expression formula was proposed for the stress endured by the nose of the projectile during cratering.The calculation results display that the proposed stress formula can describe the relation between the penetration velocity and the crater depth under high-velocity impact.