摘要
采用DHR9401作为加载工具对充液夹层构形的薄壁半球壳组合结构受质量块冲击的动力响应进行了实验研究。给出了冲击力和内压力时程曲线,结合实验变形过程的观察可以看出,冲击引起半球壳的动力响应可分为4个阶段:冲击点处的扁平化;壳面凹陷形成塑性铰并向外扩张;冲头对塑性棱区的压平以及弹性恢复。实验结果表明,双层充液球壳在受到载荷冲击时,由于液体作用使外壳受到的局部冲击转化成面载荷均匀加载在内壳上,使之具有更大的承载能力。采用夹层充液组合构形的半球壳组合结构的耐撞性有了很大的提高,在一定的冲击能量下,内部的球壳变形量很小,可以提供有效的安全防护空间。
Experiments were carried out to study the dynamic response of the liquid-filled thin-wall hemispherical shell under impact using the DHR9401 drop hammer as the loading device.According to the configurations of the hemispherical shells,the experimental device was elaborately designed to achieve the ideal seal for filling liquid.The time histories of the impact force and the internal pressure were recorded for different hemispherical shells.Four distinct deformation modes of the hemispherical shells under impact were observed as follows：（1） flattening of the upwardly protruding points,（2） inward dimpling with plastic hinges followed by outward expanding,（3） flattening of the plastic edge regions,and（4） elastic recovering.The experimental results show that double-wall liquid-filled hemispherical shells have better impact resistance than the single-wall hemispherical shells,for the liquid filled can reduce the deformation of the internal shell by turning point impact into even surface impact under the experimental impact conditions.So the double or multi-layer liquid-filled hemispherical shells can provide satisfying protection under a certain impact loading.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2012年第6期561-567,共7页
Explosion and Shock Waves
基金
国家自然科学基金项目(11072167)
山西省青年学术带头人支持计划~~
关键词
固体力学
动力响应
冲击
半球壳
充液
solid mechanics
dynamic response
impact
hemi-spherical shell
liquid-filled
