Searching for auxetics with DYNA3D and ParaDyn

We sought to simulate auxetic behavior by carrying out dynamic analyses of mesoscopic model structures. We began by generating nearly periodic cellular structures. Four‐node “Shell” elements and eight‐node “Brick” elements are the basic building blocks for each cell. The shells and bricks obey standard elastic‐plastic continuum mechanics. The dynamical response of the structures was next determined for a three‐stage loading process: (1) homogeneous compression; (2) viscous relaxation; (3) uniaxial compression. The simulations were carried out with both serial and parallel computer codes – DYNA3D and ParaDyn – which describe the deformation of the shells and bricks with a robust contact algorithm. We summarize the results found here. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)