Novel polyhedral mechanical metamaterial exhibiting negative Poisson’s ratio

Abstract The work presents a novel polyhedral mechanical metamaterial based on rotating triangular prisms connected by their corners, which possesses the ability to attain large values of negative Poisson’s ratio (NPR). Through kinematic model proposed structure, we evaluate auxeticity system varying geometrical parameters polyhedrons composing elementary cell structure. results highlight peculiar NPR system, whose are nearly constant over significant strain ranges. Focusing most promising auxetic mechanisms designed chiral architectures that replace ideal hinges at corners with curved-shape ligaments, and validated these configurations through three-dimensional printed specimens. specimens were tested under uniaxial compression simulated finite element analyses. Experimental exhibited an excellent agreement computational predictions in terms elastic modulus auxeticity, showing value up −1.3 for one designs. Our findings demonstrate highly property systems, allow design architected materials useful, example, biomechanical applications.