多层金属多孔复合结构面外压缩吸能特性实验  

An Experimental Investigation on Energy Absorption of Multi-layer Sandwich Structures with Metallic Corrugated Cores under Out-of-plane Compressive Load

作　　者：赵雪[1] 闫雷雷[1,2] 卢天健[2,3] 常青 ZHAO Xue YAN Leilei LU Tianjian CHANG Qing(Science College, Air Force Engineering University, Xi＇an 710051, China State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi＇an Jiaotong University, Xi＇an 710049, China MOE Key Laboratory for Muhifunctional Materials and Structures, Xi＇an Jiaotong University, Xi＇an 710049, China Xi＇an Architectural Desig-Research Instituts, Xi＇an 710054, China)

机构地区：[1]空军工程大学理学院,西安710051 [2]西安交通大学机械结构强度与振动国家重点实验室,西安710049 [3]西安交通大学多功能材料和结构教育部重点实验室,西安710049 [4]西安市建筑设计研究院,西安710054

出　　处：《空军工程大学学报（自然科学版）》2017年第4期28-33,共6页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金(51601221;11504429);机械结构强度与振动国家重点实验室开放课题(SV2016-KF-22)

摘　　要：轻量化及多功能一体化设计成为武器装备性能提升的迫切目标需求,以金属点阵和金属泡沫为代表的金属多孔材料由于具有超轻、超强、高能量吸收率及多功能可设计性等优点得到了广泛的重视,但金属点阵结构的屈曲及泡沫金属的低强度问题成为制约其工程应用的瓶颈。通过将泡沫金属填充到金属点阵孔隙中的方法获得3种不同几何构型的多层金属多孔复合结构——泡沫铝填充双层金属波纹板,并对其承载及能量吸收特性进行了面外压缩实验研究。研究表明新型金属多孔复合结构单位质量峰值压缩强度及单位质量能量吸收可分别高达其对应的空心结构的9.3及21.8倍,甚至和泡沫铝这一优异吸能材料相比仍可分别提高19%和20%。耦合增强机理表明正是泡沫铝的填充改变了波纹芯体的屈曲变形模式,使其转化为更为复杂高阶的屈曲变形模式,产生耦合增强效应,从而引起强度及能量吸收效率的大幅提升。Lightweight and multi-functional design become the urgent needs of our army weapons and equipment.Taking metallic foam and lattice structures as representative,these materials are characterized by ultra-light and high energy absorption efficiency.However,core web buckling of metal lattice core and low strength of the metallic foam critically limit their engineering applications.In this paper,multi-layer metallic sandwich structures with empty and aluminum foam-filled corrugated cores of three different configurations are obtained by filling aluminum foam into the space of the corrugated cores,and their load car-rying and energy absorptioncapabilities are experimentally studied under out-of-plane compressive load.The results show that the peak compressive strength and specific energy absorption of the foam-filled panels canbe 9.3and 21.8times as high as those of the empty panels,and even increase by 19%and 20%compared with aluminum foam respectively.The coupling enhancement mechanism indicates that the filling of the aluminum foam transforms the buckling mode of the corrugated core memberinto a high-order one,resulting in a substantial increase in strength and energy absorption efficiency.The excellent performance in load carrying and energy absorption of the novelsandwich structure with hybrid core make it competitive in integrative design of light weightstructures.

关 键 词：多孔复合结构 泡沫金属 面外压缩 应力应变 能量吸收 

分 类 号：V25[一般工业技术—材料科学与工程] O3[航空宇航科学与技术—航空宇航制造工程]