摘要
为提高蜂窝夹芯结构共面方向的承载性能,从仿生序构角度,提出一种组合型类蜂窝夹芯结构,并对其面内力学性能进行研究。首先,从深海鱼的骨骼结构中仿生设计出一种功能基元,并将该基元4个一组在空间组合成一个基本单元,再将此单元在水平和垂直方向上阵列得到一种四边形里嵌套八边形的组合型类蜂窝夹芯结构;然后,根据胞元理论将该结构进行简化,采用经典梁弯曲理论与胡克定律推导出其面内等效力学参数公式;采用压缩实验和数值模拟进行力学参数的对比验证,得到该结构面内等效弹性模量的实验值、仿真值与理论值之间的误差分别为13.68%和10.60%,验证了组合型类蜂窝夹芯结构面内等效力学参数的准确性。在相同等效密度下,将所设计的组合型类蜂窝夹芯结构和该课题组以前提出的“超轻多孔”类蜂窝夹芯结构进行等效力学性能对比实验,结果表明:所设计的组合型类蜂窝夹芯结构的面内等效弹性模量是类蜂窝夹芯结构的20倍左右,其刚度有显著提升,该研究成果为新型蜂窝结构创新设计提供了思路。
To improve the bearing performance of the honeycomb core structure in the coplanar direction,a new combined quasi-honeycomb core structure is proposed from the perspective of biomimetic structure,and its in-plane mechanical properties are studied.Firstly,functional elements are bionically designed from the skeletal structure of deep-sea fish and every four such elements are grouped spatially into a basic unit.These units are arrayed in the horizontal and vertical directions to obtain a combined quasi-honeycomb core structure in which the octagon is nested in the quadrilateral.The structure is then simplified according to the cell theory,and the theoretical formulas of in-plane equivalent mechanical parameters are derived by using classical beam bending theory and Hooke’s law.Compression experiment and numerical simulation are used to verify the accuracy of in-plane equivalent mechanical parameters.It is obtained that the error in the experimental,simulated and theoretical values of the in-plane equivalent elastic modulus of the structure are 13.68%and 10.60%.This combined structure is compared with the“ultra-light porous”quasi-honeycomb core structure proposed previously by the same research team in terms of equivalent mechanical properties.The results show that the in-plane equivalent elastic modulus of the former is about 20 times that of the latter under the same equivalent density,and the stiffness of the former is significantly increased.These results can provide new perspectives for innovative design of new honeycomb core structures.
作者
李响
段宇
宋小俊
王艳苗
秦红玲
曹祥斌
LI Xiang;DUAN Yu;SONG Xiaojun;WANG Yanmiao;QIN Hongling;CAO Xiangbin(Hubei Engineering Research Center for Graphite Additive Manufacturing Technology and Equipment, China Three Gorges University, Yichang, Hubei 443002, China;College of Mechanical and Power Engineering, China Three Gorges University, Yichang, Hubei 443002, China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2022年第7期168-176,共9页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51975325,51305232)
三峡大学石墨增材制造技术与装备湖北省工程研究中心开放基金资助项目(HRCGAM202108)。
关键词
夹芯结构
组合型类蜂窝
面内力学性能
等效力学参数
压缩实验
sandwich structure
combined quasi-honeycomb
in-plane mechanical properties
equivalent mechanical parameters
compression experiment
