Tunable thermal transport in 4D printed mechanical metamaterials

• DOI: 10.1016/j.matdes.2023.111992
• Publication Date: 2023-05-11T21:12:57Z
• Authors: Charles Abdol-Ham...; Yueping Wang; Shiva Farzinazar; Chen Yang; Howon Lee; Jaeho Lee
• Keywords: Shape-memory polymer

Here the authors present an active thermal control system using 4Dprinted shape memory polymers and demonstrate how distinct deformation mechanisms lead to unique, tunable properties stretching- bending-dominated architectures. Infrared thermography measurements with varying temperature compression settings show that at low strains, radiation drives effective conductance increase as view factors among struts increasing strain, higher conduction strut-to-strut contact areas increase. The increases from 4.41mW/K 14.52mW/K 3.23mW/K 10.48mW/K for Kelvin foam octet-truss microlattices, respectively, strain 0% approximately 70%. As is adjusted, stretching-dominated architecture exhibits abrupt changes in due buckling. allows gradual geometric precise tuning of conductance. These findings provide a new understanding transport phenomena 4D-printed metamaterials, which may be breakthrough systems.