摘要
通过数值计算研究规则排布和交错排布的三角形铝蜂窝在面内冲击荷载下的变形模式、承载能力以及能量吸收特性。结果表明两种蜂窝的变形均随着冲击速度的增加或胞壁厚度的减小而向冲击端集中,规则排布的蜂窝沿着局部变形带逐行压溃直至密实,而交错排布蜂窝的变形模式可分为4种。铝蜂窝吸收的能量绝大部分转化为变形所需的内能,动能所占比重较小。随着冲击速度的提高,两种排布方式的蜂窝均表现出更强的承载能力和能量吸收能力,但内能在总能量中的比重减小,动能比重增加。规则排布的蜂窝比交错排布的蜂窝具有更高的承载力和能量吸收能力,该差别主要是由于二者内能的不同所引起,且该差值在交错排布蜂窝"核区"形成后逐渐减小。
The deformation patterns,the load-bearing capacity,and the energy absorption behavior of honeycombs filled with regular-arranged and stagger-arranged triangular cells under in-plane impact were studied by using numerical simulation.The results showed that the deformation bound of honeycombs is gradually concentrated to the impact place with increase in impact velocity or decrease in cell wall thickness;the honeycomb filled with regular-arranged cells is crushed row by row to densification,while four kinds of deformation pattern are summed up for the honeycomb filled with stagger-arranged cells;most of the energy absorbed by honeycombs is converted into strain energy,while kinetic energy has a less proportion;with increase in impact velocity,both of the two kinds of honeycomb reveals stronger ability to bear load and absorb energy,the proportion of strain energy decreases with increase in impact velocity,while the proportion of kinetic energy increases;the honeycombs filled with regular-arranged cells have better load-bearing capacity and energy absorption ability than the ones filled with stagger-arranged cells due to their different strain energy,and the difference gradually diminishes after the core region in the honeycomb filled with stagger-arranged cells appears.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第5期226-229,235,共5页
Journal of Vibration and Shock
基金
国家自然科学基金项目(10802100)
高校基本科研业务费中山大学青年教师培育项目(3161263)
关键词
蜂窝
冲击
变形模式
能量吸收
honeycomb
impact
deformation pattern
energy absorption
