Premium
Different Deformation Mechanisms Leading to Auxetic Behavior Exhibited by Missing Rib Square Grid Structures
Author(s) -
Farrugia PierreSandre,
Gatt Ruben,
Zammit Lonardelli Enrico,
Grima Joseph N.,
Evans Ken E.
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201800186
Subject(s) - auxetics , square (algebra) , deformation (meteorology) , poisson distribution , rib cage , poisson's ratio , finite element method , bending , square tiling , grid , materials science , compression (physics) , structural engineering , composite material , geometry , mathematics , engineering , statistics
An extensive investigation is carried out on the missing rib square grid structure using finite element simulations. This showed that, in the cases considered in this study, the type of deformation is primarily dependent on the ratio of the thickness of different ribs with the structure behaving like an anti‐tetrachiral at particular ratios. The analysis also showed that the ability of the structure to deform predominantly through the bending of the ligament allows it to achieve much more negative values of the Poisson's ratio than previously reported. Confirmation of the numerical results is obtained through experimental methods involving the 3D printing of representative structures which are subsequently subjected to compression.