一种偏航型遮弹层侵彻深度评估方法

Assessment Method of Penetration Depth of Yaw-inducing Shelter Plate Subjected to Projectile Impact

偏航型遮弹层作为一种新型复合遮弹层已引起世界各国防护工程界的极大关注。为合理评估偏航型遮弹层的弹体侵彻深度,在弹体垂直入射和斜入射的侵彻深度计算方法基础上,通过引入斜入射偏转系数和偏航层偏转系数来综合考虑弹体攻角效应、命中姿态以及靶体自由表面等因素的影响,建立了概率意义上的偏航型遮弹层侵彻深度简化计算公式。计算结果表明:斜入射偏转系数随命中角和初始攻角的增大而减小,随命中速度增大而增大;偏航层偏转系数随命中速度增大而减小。侵彻深度评估公式的计算结果与试验结果吻合较好,当命中速度较小时,理论计算结果与试验结果较为接近;当命中速度较大时,理论计算结果与试验结果偏差稍大,说明当命中速度较大时弹头部分发生严重变形或破坏,实际的侵彻阻力大于理论值,评估公式尚需进一步修正。

Yaw-inducing shelter plate is a new composite bursting layer. In order to accurately estimate the anti-penetration capacity of yaw-inducing shelter plate,a simplified assessment method for penetration depth of yaw-inducing shelter plate with irregular barriers on surface subjected to projectile impact is presented based on the calculation methods of penetration depth of projectile at normal and oblique impact angles. The influencing factors,such as attack angle,angular velocity,impact attitude of projectile and uncontrolled free surface of target,are synthetically taken into account by introducing the deflection coefficients of oblique impact and yaw-inducing layer into conventional formula. The calculated results show that the values of deflection coefficient of oblique impact decrease with the increase in both impact angle and initial attack angle,but increase as impact velocity increases. The values of deflection coefficient of yaw-inducing layer decrease with the increase in impact velocity. The calculated results of the simplified formula are in good agreement with the experimental data. The theoretical results are agreement with experimental data at low impact velocity,but there is some deviation between them at higher impact velocity. It is indicated that the head of projectile would be deformed badly or damaged at higher impact velocity,the actual penetration resistances of projectile are larger than the theoretical values,and the estimatedpenetration depths of assessment method should be revised.