摘要
为提升金属蜂窝结构抗冲击能力,提出了封闭弯折型蜂窝、内凹填充型蜂窝、星形曲边型蜂窝三种新型抗冲击防护结构.采用ANSYS/LS-DYNA的有限元仿真进行分析,分析各冲击速度下三种蜂窝的变形特征和能量吸收能力.研究结果表明:三种蜂窝结构的变形模式与胞元结构和冲击速度有关.封闭弯折型蜂窝名义应力和能量吸收效率优于其他结构;蜂窝胞元的几何参数不影响名义应力-应变曲线的变化趋势.封闭弯折型蜂窝弯折角度越大、平台应力值越高,密实应变值降低.在中速冲击时,60°封闭弯折型蜂窝结构的平台应力相较45°结构提升了19.5%;提高相对密度能有效的提高蜂窝结构的吸能效率,高密度60°封闭弯折型蜂窝结构的比吸能相较于低密度提升了207.6%.
In order to improve the impact resistance of metal honeycomb structures,three new types of impact protection structures,namely,closed bent honeycomb,concave filled honeycomb,and star-shaped curved honeycomb,are proposed.Numerical simulations of the honeycomb impact resistance were carried out using the ANSYS/LS-DYNA finite element method,and the deformation patterns and energy absorption capacities of the three honeycombs were analyzed under different impact velocities.The results show that the deformation patterns of the three honeycomb structures are related to the cellular element structure and impact velocity.The nominal stress and energy absorption efficiency of the closed-bending honeycomb are better than those of the other structures;the geometrical parameters of the honeycomb cell elements do not affect the trend of the nominal stress-strain curves.The larger the bending angle of the closed bend honeycomb,the higher the value of platform stress and the lower the value of dense strain.Under the medium-velocity impact,the platform stress of 60°closed bend honeycomb structure increased by 19.5%compared with that of 45°structure;increasing the relative density can effectively improve the energy absorption efficiency of the honeycomb structure,and the specific energy absorption of the high-density 60°closed-bend honeycomb structure increased by 207.6%compared with that of the low-density.
作者
李成兵
肖可
李锐
冯旭鹏
彭俊恒
Chengbing Li;Ke Xiao;Rui Li;Xupeng Feng;Junheng Peng(College of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu,610500;Oil and Gas Equipment Technology,Sharing and Service Platform of Sichuan Province,Chengdu,610500;Chengdu Aerospace Communication Equipment Co.,Ltd.,Chengdu,610051)
出处
《固体力学学报》
北大核心
2025年第5期693-706,共14页
Chinese Journal of Solid Mechanics
关键词
蜂窝结构
变形模式
平台应力
能量吸收效率
honeycomb structure
deformation pattern
platform stress
energy absorption efficiency
