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Journal of Materials Science

, Volume 42, Issue 18, pp 7690–7695 | Cite as

Kinematical studies on rotation-based semi-auxetics

  • Teik-Cheng LimEmail author
Article

Abstract

Auxetic materials are those which exhibit negative Poisson’s ratio, i.e. these solids expand transversely when stretched longitudinally. In recent years the concept of semi-auxetics has been examined for cellular solids based on combination of re-entrant and hexagonal microstructures. In this paper we identify a type of rotating unit that gives positive Poisson’s ratio so that a study can be made on rotating sub-structures that exhibit both positive and negative Poisson’s ratio characteristics. A second type of rotating geometry, whose Poisson’s ratio shifts from negative to positive as stretching increases, has also been identified. Based on kinematical studies we explore the relationship between the on-axis Poisson’s ratios in terms of novel lattice geometry and the magnitude of deformation.

Keywords

Virtual Link Geometrical Assumption Projected Length Kinematical Assumption Conventional Behavior 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.School of Science and TechnologySIM University (UniSIM)SingaporeRepublic of Singapore

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