title: Dimpled elastic sheets: a new class of non-porous negative Poisson's ratio materials.
abstract: In this study, we report a novel periodic material with negative Poisson's ratio (also called auxetic materials) fabricated by denting spherical dimples in an elastic flat sheet. While previously reported auxetic materials are either porous or comprise at least two phases, the material proposed here is non-porous and made of a homogeneous elastic sheet. Importantly, the auxetic behavior is induced by a novel mechanism which exploits the out-of-plane deformation of the spherical dimples. Through a combination of experiments and numerical analyses, we demonstrate the robustness of the proposed concept, paving the way for developing a new class of auxetic materials that significantly expand their design space and possible applications.
authors.affiliation: Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, 02138, USA.
authors.forename: Farhad
authors.initials: F
authors.lastname: Javid
authors.affiliation: Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, 02138, USA.
authors.forename: Evelyne
authors.initials: E
authors.lastname: Smith-Roberge
authors.affiliation: Siemens ADGT, 9545 Cote de Liesse, Dorval, Québec, H9P 1A5, Canada.
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Innes
authors.affiliation: Siemens ADGT, 9545 Cote de Liesse, Dorval, Québec, H9P 1A5, Canada.
authors.forename: Ali
authors.initials: A
authors.lastname: Shanian
authors.affiliation: Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, 02138, USA.
authors.forename: James C
authors.initials: JC
authors.lastname: Weaver
authors.affiliation: Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, 02138, USA.|Kavli Institute, Harvard University, Cambridge, Massachusetts, 02138, USA.
authors.forename: Katia
authors.initials: K
authors.lastname: Bertoldi