表面异形遮弹层的诱偏机理与试验

Yaw-inducing Mechanism and Experimental Investigation of Shielding Layer With Irregular Barrier on Surface

为揭示表面异形遮弹层的诱偏机理,采用Hertz接触理论建立了弹体与偏航层中异形体撞击的力学模型,综合考虑了弹体入射姿态、命中速度以及异形体材料特性、几何参数等因素的影响,并根据刚体运动学理论进一步导出弹体与异形体撞击过程中的运动微分方程.弹体偏转角随命中速度增大而增大;在一定速度范围内,计算结果与试验数据较为接近.结果表明,弹体在撞击异形体的过程中受到巨大的非对称力作用,且其作用随命中速度增大而增大,致使产生较大的攻角和角速度,削弱了弹体侵彻威力.

To study the yaw-inducing mechanism of shielding layer with irregular barrier on surface,the mechanical model of projectile impacting on yaw-inducing layer was established according to Hertz contact theory.The impact attitude and velocity of projectile,the material properties and geometrical size of irregular barrier were synthetically taken into account.The dynamic differential equations while projectile impacting on irregular barrier were presented based on rigid kinematics theory.The yawing angle of projectile increases with the increase of impact velocity,and the calculation results are close to experimental results in definite impact velocity.The result shows that the attack angle and angular velocity are obviously generated due to the great unsymmetrical contact forces caused by irregular barrier.The unsymmetrical contact forces increase with the increase of impact velocity,and the penetration capacity of the projectile is reduced greatly.