Design of hinged 3D auxetic mechanisms

Abstract

I’ll talk about a joint project with Sabetta Matsumoto to investigate theoretical and (via 3D printed models) practical possibilities for designing three-dimensional auxetic mechanisms. We consider connections between existing two-dimensional designs, and generalize these to three-dimensions.

We propose two general schemes for designing 3D auxetic mechanisms, one using two counterrotating copies of 2D mechanisms such as the diamondplate, kagome and jitterbug mechanisms, and the other using a “branched” version of the scissor linkage. In all cases, these use the Sarrus linkage to ensure that the mechanism has only one degree of freedom.