摘要
为研究步枪弹撞击带软硬复合防护明胶靶标的作用过程和作用机理,采用显式有限元方法对7.62 mm步枪弹侵彻复合靶标过程进行数值模拟,分析侵彻过程中的典型现象及明胶靶标动态响应。数值计算结果表明:陶瓷锥的形成是由压缩应力波和拉伸应力波共同作用的结果;弹头加速度变化存在明显的分段与拐点,侵彻陶瓷面板过程中,加速度达到最大,侵彻聚乙烯(PE)背板层时,出现第二个拐点;由于防护层存在多个界面,撞击过程中PE背板界面存在速度多峰现象:当弹头运动加速度达到最大时,PE背板界面出现第一个速度峰,明胶界面出现第一个压力峰;当弹头开始侵彻PE背板时,背板层出现第二个速度峰;在步枪弹撞击过程中明胶内压力波传递呈现球形波基本形态,压力峰值随距离增加呈指数衰减。
In order to explore the interaction process and mechanism of bullet impacting a gelatin target with hard/soft composite armor, the penetration of 7.62 mm bullet into composite armor and gelatin is nu- merically simulated using an FEA method,and the typical phenomena of impacting process and the dynamic response of gelatin target are analyzed. The simulation results show that the formation of the ceramic cone results from the compressive and tensile stress waves. The obvious segmentation and inflection points display on the curve of projectile acceleration. The acceleration reaches its maximum when the pro- jectile penetrates into a ceramic faceplate. The second inflection point appears when the projectile pene- trates into PE rear plate. The multi-peaks appear on the velocity curve of PE rear plate due to multiple interfaces on protection layer： When the projectile reaches the maximum acceleration, the first peak appears, and the first pressure peak appears on gelatin interface ;the second peak appears when the projectile penetrates into PE rear plate. The propagation of pressure wave in gelatin presents the basic form of spherical wave, and the pressure peak propagation complies with the law of exponential decay.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2014年第8期1172-1178,共7页
Acta Armamentarii
关键词
兵器科学与技术
枪弹
数值模拟
软硬复合防护
明胶
侵彻
ordnance science and technology
bullet
numerical simulation
hard/soft composite armor
gelatin
penetration
