Austic structures with slanted slots located in specially designed patterns for custom NPR behavior and improved cooling performance

摘要

An auxetic structure, an auxetic sheet for cooling cooling, systems and devices with auxetic structures, and methods of using and manufacturing auxetic structures are disclosed. An auxetic structure is disclosed that includes an elastic rigid body having back-to-back top and bottom surfaces. First and second plurality of elongated apertures extend through the elastic rigid body from the top surface to the bottom surface. The first plurality of elongated apertures extends laterally with respect to the second plurality of elongated apertures. The first and / or second plurality of elongated apertures are obliquely angled with respect to the upper surface of the elastic rigid body. The elongated apertures are cooperatively configured to provide the desired cooling performance and exhibit stress relief through negative Poisson's ratio behavior under macroscopic and planar loading conditions. For example, an auxetic structure can exhibit a blown cooling efficiency of approximately 30-50 Eta and a Poisson's ratio of approximately -0.2 to -0.9%.