title: Double-Negative Mechanical Metamaterials Displaying Simultaneous Negative Stiffness and Negative Poisson's Ratio Properties.
abstract: A scalable mechanical metamaterial simultaneously displaying negative stiffness and negative Poisson's ratio responses is presented. Interlocking hexagonal subunit assemblies containing 3 alternative embedded negative stiffness (NS) element types display Poisson's ratio values of -1 and NS values over two orders of magnitude (-1.4 N mm-1to -160 N mm-1), in good agreement with model predictions.
authors: Materials and Engineering Research Institute, Faculty of Arts, Computing, Engineering and Sciences, Sheffield Hallam University, Howard Street, Sheffield, S1 1WB, UK.
authors: Trishan A M
authors: TA
authors: Hewage
authors: 72 Phillips Lane, Formby, Liverpool, L37 4BQ, UK.
authors: Kim L
authors: KL
authors: Alderson
authors: Materials and Engineering Research Institute, Faculty of Arts, Computing, Engineering and Sciences, Sheffield Hallam University, Howard Street, Sheffield, S1 1WB, UK.
authors: Andrew
authors: A
authors: Alderson
authors: Advanced Composites Centre for Innovation and Science, University of Bristol, University Walk, Bristol, BS8 1TR, UK.
authors: Fabrizio
authors: F
authors: Scarpa
keywords: auxetic; mechanical metamaterials; mechanical properties; negative Poisson's ratio; negative stiffness