摘要
基于一维应力波理论对高强水中冲击波在不同介质间的传播进行分析,提出了2种防护含液结构的空气夹层形式,建立了数值仿真模型。在验证数值仿真方法的基础上,分析了含液结构在弹体侵彻过程中空穴演化、冲击波传播、空气夹层结构变形等的动态变化过程及弹体速度衰减规律,讨论了不同舱室结构在球形弹体侵彻作用下的冲击波特点和结构不同组成部分的能量转换关系,对比了不同弹速下前后板的塑性变形。研究结果表明:(1)在含液结构中添加空气夹层能有效降低含液结构前板和后板的冲量、能量和塑性变形;(2)空气夹层影响前后板变形的主要原因为阻抗失配和空气夹层变形引起的稀疏波及液体空化;(3)从整体看,双层间隔板结构衰减前后板变形能力优于方格夹层板结构,但随着弹速的增加,双层间隔夹层板的前后壁变形相互制约,2种结构对含液塑性变形的改变逐渐接近。
Based on the one-dimensional stress wave theory,two kinds of air-contain structures were presented.Their numerical simulation models were established. Based on verifying these simulation models,the dynamic change processes of cavity evolution,shock wave propagation and air-contain structure deformation for a liquid-filled structure with air-contain structures under projectile penetration were analyzed,the decay law of projectile velocity was studied. Shock wave features of different cabin structures under spherical projectile penetration and energy transfer relations among different parts of cabin were discussed. The plastic deformations of front plate and rear one under different projectile velocities were compared. The study results showed that air-contain structures added in a liquid-filled structure can effectively reduce impulse,energy and plastic deformation of both front plate and rear one of the liquid-filled structure;the cause of air-contain structures affecting deformations of front plate and rear one is impedance mismatch,expansion wave due to air-interlayer deformation and liquid cavitation; double-layer plate structure's ability to reduce deformation of liquid-filled structures is superior to that of square sandwich plate one,but with increase in projectile velocity,their difference drops gradually.
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第3期186-194,209,共10页
Journal of Vibration and Shock
基金
国防基础研究基金(B1420133057)
自然科学基金(11302259)
中央高校基本科研业务费专项资金(2014-YB-20)
关键词
空气夹层
含液结构
液舱
水锤效应
高速弹体
侵彻
air-contain structure
liquid-filled structure
liquid tank
water hammer effect
high velocity projectile
penetration
