期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 66, 期 -, 页码 218-227出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2015.03.036
关键词
Cellular structures; Hierarchy; Large deformation mechanisms; Auxetic behavior; Instability
类别
资金
- NPRP award from the Qatar National Research Fund (a member of the Qatar Foundation) [NPRP 5-1298-2-560]
Small and large deformation in-plane elastic response of a new class of hierarchical fractal-like honey-combs inspired by the topology of the spiderweb were investigated through analytical modeling, detailed numerical simulations, and mechanical testing. Small deformation elasticity results show that the isotropic in-plane elastic moduli (Young's modulus and Poisson's ratio) of the structures are controlled by dimension ratios in the hierarchical pattern of spiderweb, and the response can vary from bending to stretching dominated. In large deformations, spiderweb hierarchy postpones the onset of instability compared to stretching dominated triangular honeycomb (which is indeed a special case of the proposed spiderweb honeycomb), and exhibits hardening behavior due to geometrical nonlinearity. Furthermore, simple geometrical arguments were obtained for large deformation Poisson's ratio of first order spiderweb honeycombs, which show good agreement with numerical and experimental results. Spiderweb honeycombs exhibit auxetic behavior depending on the non-dimensional geometrical ratio of spiderweb. (C) 2015 Elsevier Ltd. All rights reserved.
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