Thermo-Mechanically Tunable Elastic Metamaterials with Compliant Porous Structures

[+] Author and Article Information
Hyeonu Heo

ASME Member Adjunct Professor Mechanical and Energy Engineering, University of North Texas, Denton, TX 76207

Kwangwon Kim

School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang-si, Gyeonggi-do, 10540, South Korea

Addis Tessema

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

Addis Kidane

ASME Member Assistant Professor Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

Jaehyung Ju

ASME Member Associate Professor UM-SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China

1Corresponding author.

ASME doi:10.1115/1.4038029 History: Received May 13, 2017; Revised September 16, 2017


Adding programmable function to elastic metamaterials makes them versatile and intelligent. The objective of this study is to design and demonstrate thermo-mechanically tunable metamaterials with a compliant porous structure (CPS) and to analyze their thermo-mechanical behaviors. CPS, the unit cell of the metamaterial, is composed of rectangular holes, slits, and bi-material hinges. By decomposing kinematic rotation of a linked arm and elastic deformation of a bi-material hinge, a thermo-mechanical constitutive model of CPS is constructed, and the constitutive model is extended to a three-dimensional (3D) polyhedron structure for securing isotropic thermal properties. Temperature-dependent properties of base materials are implemented to the analytical model. The analytical model is verified with finite element (FE) based numerical simulations. A controllable range of temperature and strain is identified that is associated with a thermal deformation of the bi-material hinge and contact on the slit surfaces of CPS. We also investigate the effect of geometry of CPS on the thermal expansion and effective stiffness of the metamaterial. The metamaterial with CPS has multiple transformation modes in response to temperature while keeping the same mechanical properties at room temperature, such as effective moduli and Poisson's ratios. This work will pave the road toward the design of programmable metamaterials with both mechanically- and thermally- tunable capability, providing unique thermo-mechanical properties with a programmable function.

Copyright (c) 2017 by ASME
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