关键词: 平底榴弹, 引信, 跌落冲击特性, 冲击加速度峰值, 冲击作用时间

Abstract: A formula for the impact characteristics of flat base projectile and fuze when the projectile drops vertically is proposed for studying the vertical drop impact characteristics of a flat base projectile without package with bottom-down involved in the design of fuze setback arming device. On the basis of simplified assumption, the theoretical calculation formulas are derived to calculate the peak acceleration and impact duration of the projectile dropping vertically and colliding with ground targets by using elastoplastic mechanics theory. A 152 mm caliber flat base projectile is used as a benchmark, the processes of projectiles with different calibers dropping vertically and colliding with ground targets are simulated by using software ANSYS/LS-DYNA. Based on simulated peak impact acceleration and duration of impact, the theoretical formulas are corrected through modification of constant coefficient. The formulas for the impact characteristics of projectile and fuze when the flat base HE projectile drops vertically downward were obtained. The results show that the larger diameter of the projectile is， the smaller peak impact acceleration is and the longer duration of impact is. The drop height only changes the peak impact acceleration. The impact recovery coefficient only changes the duration of impact. In the case of fully elastic collision， the projectile falls to any target at the same height， the product of peak impact acceleration and duration of impact is constant.

Key words: flatbaseprojectile, fuze, dropimpactcharacteristic, durationofimpact, flatbaseprojectile