Symmetry detection of auxetic behaviour (Simon Guest, University of Cambridge, UK)

The talk will describe a symmetry criterion that will show when a periodic system made up of bars, bodies and joints will have an 'equiauxetic' mechanism, that is, show the limiting behaviour of Poisson ratio equal to -1, with equal expansion/contraction in all directions. These systems can provide good models for the design of  lattice materials with high, stretching-dominated, shear modulus, but low, bending-dominated, bulk modulus.