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	MECHANICS OF NATURAL HONEYCOMB AS PARADIGM FOR DESIGN OF UNCONVENTIONAL CELLULAR MATERIALS
	Zhang, Kai ; Duan, Huiling ; Wang, Jianxiang ; Karihaloo, Bhushan L.
	2011
关键词	natural honeycomb mechanical property surface coating
英文摘要	Engineering honeycombs mimic the macroscopic geometry of natural honeycombs, but have yet to achieve the micro-structural sophistication of their natural counterparts. We studied the hierarchical structures, and measured the mechanical properties, of natural honeycombs. We show that the honeycomb walls are progressively self-stiffened with the time of usage, by adding reinforced layers reminiscent of modern fibre-reinforced composite laminates. The overall shear modulus of the comb increases more than threefold in one year and fourfold in two years. We also calculated the effective coefficient of thermal expansion of the honeycomb. The properties of conventional engineering porous or cellular media including honeycombs with homogeneous walls are bounded by two inherent constraints, namely, low stiffness and un-tunable coefficient of thermal expansion (CTE) by their microstructures. The natural honeycombs may serve as a prototype of truly bio-mimetic unconventional cellular materials with improved stiffness and a tunable coefficient of thermal expansion via pore surface coating, as well as an example of cellular materials with structural transformation. Stiff, strong, and lightweight porous materials with tunable CTE are ideal for applications in environments with large temperature fluctuations.; Materials Science, Multidisciplinary; Mechanics; CPCI-S(ISTP); 0
语种	英语
内容类型	会议论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/406314]
专题	工学院
推荐引用方式 GB/T 7714	Zhang, Kai,Duan, Huiling,Wang, Jianxiang,et al. MECHANICS OF NATURAL HONEYCOMB AS PARADIGM FOR DESIGN OF UNCONVENTIONAL CELLULAR MATERIALS[C]. 见:.

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