摘要
基于蜂窝在冲击荷载下胞结构的特殊变形机制,将蜂窝在冲击荷载下吸收的能量分解为3部分,即塑性铰所耗散的塑性功、胞壁的动能以及胞壁间相互碰撞所耗散的能量。通过探讨3部分能量之间的分配关系,分离出用于提高蜂窝承载力和能量吸收能力的有效因素,即惯性效应。该效应随冲击速度的增加和胞壁厚度比的减小而增强,并且由于惯性效应所增加的能量在耗散过程中又被平均分为两部分:一部分转换为胞壁的动能,另一部分在胞壁的碰撞过程耗散掉。该研究揭示了蜂窝在冲击荷载下的能量吸收机理,对蜂窝材料的设计具有一定的指导意义。
Based on the special deformation mechanism of the cellular structure under dynamic crushing,the energy absorption of honeycombs under dynamic crushing is decomposed into three parts: the energy dissipated by the plastic hinges,the kinetic energy of cell walls,and the dissipated energy due to the collision among the cell walls.By discussing the energy partitioning of the three parts,the inertia effect can be considered as the effective factor in enhancing both the crushing strength and the energy absorption capacity of honeycombs under dynamic crushing.This effect is intensified with the increase in impact velocity and the decrease in thickness ratio of cell wall.The added energy resulted from the inertia effect can be divided into equal halves,of which one half is transformed into the kinetic energy of cell walls, and the other half is dissipated by the collision of cell walls.The study discloses the energy absorption mechanism of honeycombs.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第S2期24-27,共4页
Acta Armamentarii
基金
国家自然科学基金项目(10802100)
中山大学青年教师科研启动基金项目(2007390003171911)
关键词
蜂窝
惯性效应
能量吸收
冲击
honeycomb
inertia effect
energy absorption
dynamic crushing
