Elastic constants of 3-, 4- and 6-connected chiral and anti-chiral honeycombs subject to uniaxial in-plane loading |
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Authors: | A Alderson KL Alderson D Attard KE Evans R Gatt JN Grima W Miller N Ravirala CW Smith K Zied |
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Affiliation: | 1. Centre for Materials Research and Innovation, University of Bolton, Deane Road, Bolton BL3 5AB, UK;2. Faculty of Science, University of Malta, Msida MSD 06, Malta;3. Department of Engineering, University of Exeter, Exeter EX4 4QF, UK |
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Abstract: | Finite element models are developed for the in-plane linear elastic constants of a family of honeycombs comprising arrays of cylinders connected by ligaments. Honeycombs having cylinders with 3, 4 and 6 ligaments attached to them are considered, with two possible configurations explored for each of the 3- (trichiral and anti-trichiral) and 4- (tetrachiral and anti-tetrachiral) connected systems. Honeycombs for each configuration have been manufactured using rapid prototyping and subsequently characterised for mechanical properties through in-plane uniaxial loading to verify the models. An interesting consequence of the family of ‘chiral’ honeycombs presented here is the ability to produce negative Poisson’s ratio (auxetic) response. The deformation mechanisms responsible for auxetic functionality in such honeycombs are discussed. |
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Keywords: | A Smart materials B Mechanical properties C Deformation C Elastic properties C Finite element analysis (FEA) |
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