Auxetic effects induced by re-entrant angle and chirality with large deformation

Abstract eng:
Samma [y The two basic mechanisms of the auxetic effects for open-cell structures are: (l) re-entrant angle, and (2) cell rotation. To explore and compare the auxetic effects caused by the two mechanisms under large deformation, representative structures from each category (the re- entrant honeycombs and chiral cells) were studied. Analytical analysis, finite element (FE) simulations and experiments on 3D printed specimens were integrated to explore the finite deformation of these structures. Thorough Finite Element (FE) simulations were performed to study the influences of independent non-dimensional geometric parameters on the deformation mechanisms including auxetic effects and instability of these structures. The limiting strains for preserving auxetic effects were obtained. Compared with the re-entrant honeycomb, the chiral structures were shown to be able to preserve auxetic effects for much larger deformation. Also, by adding a reinforced core to the basic chiral structure, the auxetic effects can be effectively enlarged.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket