Programmable Auxeticity in Hydrogel Metamaterials via Shape-Morphing Unit Cells.

ABSTRACT: Mechanical metamaterials recruit unique mechanical behavior that is unavailable in bulk materials from a periodic unit cell structure with a specific geometry. However, such metamaterials can typically not be reconfigured once manufactured. Herein, the authors introduce shape morphing of a hydrogel metamaterial via spatio-selective integration of responsive actuating elements to reconfigure the mesoscale unit cell geometry to reach programmable auxeticity on the macroscale. Via thermal control, the unit cell angle of a honeycomb structure can be precisely programmed from 68° to 107°. This results in negative, zero, or positive Poisson's ratio under applied tensile strain. The geometrical reconfiguration with resulting programmable auxeticity is predicted and verified by finite element (FE)

SUBMITTER: Skarsetz O 

PROVIDER: S-EPMC9376742 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature