裸态平底榴弹底向下垂直跌落时弹丸和引信的冲击特性  

Vertical Drop Impact Characteristics of Flat Base Projectile without Package and Fuze with Bottom-down

作　　者：金路轩 闻泉[1] 王雨时[1] 王光宇 张志彪[1] JIN Luxuan;WEN Quan;WANG Yushi;WANG Guangyu;ZHANG Zhibiao(Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《兵工学报》2022年第2期260-272,共13页Acta Armamentarii

基　　金：国防科技工业局科学技术基础科研项目(995-14021006010401)。

摘　　要：针对引信后坐保险机构设计涉及的裸态平底榴弹底向下垂直跌落冲击特性问题,提出裸态平底榴弹底向下垂直跌落时弹丸和引信的冲击特性公式。根据弹塑性力学理论,在简化假设基础上,推导出普通平底弹丸垂直跌落碰撞地面目标过程的冲击加速度峰值和作用时间理论计算公式;利用有限元分析ANSYS/LS-DYNA软件,以152 mm口径平底榴弹为例,通过等比例缩放仿真了不同口径弹丸底向下垂直跌落碰撞地面目标的过程,对冲击加速度峰值和作用时间的仿真结果进行常系数修正,得到裸态平底榴弹底向下垂直跌落时弹丸和引信的冲击特性公式。结果表明:弹丸直径越大,跌落时产生的冲击峰值越小,冲击作用时间越长;跌落高度仅改变冲击加速度峰值大小;碰撞恢复系数仅改变冲击作用时间的长短;在完全弹性碰撞的情况下,弹丸以同一高度跌落至任意目标,冲击加速度峰值与冲击作用时间乘积是恒定不变的。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.

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 

分 类 号：TJ43[兵器科学与技术—火炮、自动武器与弹药工程]