Low Porosity Metallic Periodic Structures with Negative Poisson's Ratio

Auxetic behavior in low porosity metallic structures is demonstrated via a simple system of orthogonal elliptical voids. In this minimal 2D system, the Poisson's ratio can be effectively controlled by changing the aspect ratio of the voids. In this way, large negative values of Poisson's ratio can be achieved, indicating an effective strategy for designing auxetic structures with desired porosity.Engineering and Applied Science

Dimpled elastic sheets: a new class of non-porous negative Poisson’s ratio materials

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

The development of a new decision making model for material selection of polymer electrolyte fuel cell

Topsis multiple-criteria decision support analysis for material selection of metallic bipolar plates for polymer electrolyte fuel cell -- Electre decision support model for material selection of bipolar plates in polymer electrolyte fuel cells applications -- Using multi-pseudocriteria and fuzzy outranking relation analysis for material selection of bipolar plate for PEFCs -- A non-compensatory compromised solution for material selection for bipolar plates for polymer electrolyte membrane fuel cell (PEMFC) using electre IV