期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 70, 期 7, 页码 1034-1041出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2009.07.010
关键词
Smart materials; Mechanical properties; Deformation; Elastic properties; Finite element analysis (FEA)
资金
- European Union [NMP3-CT-2005-013641 - CHISMACOMB]
Four novel cylinder-ligament honeycombs are described, where each cylinder has 3 tangentially-attached ligaments to form either a hexagonal or re-entrant hexagonal cellular network. The re-entrant cylinder-ligament honeycombs are reported for the first time. The in-plane linear elastic constants and out-of-plane bending response of these honeycombs are predicted using finite element (FE) modelling and comparison made with hexagonal and re-entrant hexagonal honeycombs without cylinders. A laser-crafted re-entrant cylinder-ligament honeycomb is manufactured and characterized to verify the FE model. The re-entrant honeycombs display negative Poisson's ratios and synclastic curvature upon out-of-plane bending. The hexagonal and 'trichiral' honeycombs possess positive Poisson's ratios and anticlastic curvature. The 'anti-trichiral' honeycomb (short ligament limit) displays negative Poisson's ratios when loaded in the plane of the honeycomb, but positive Poisson's ratio behaviour (anticlastic curvature) under out-of-plane bending. These responses are understood qualitatively through considering deformation occurs via direct ligament flexure and cylinder rotation-induced ligament flexure. (C) 2009 Elsevier Ltd. All rights reserved.
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