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Biomimetics 2018, 3(3), 20; https://doi.org/10.3390/biomimetics3030020

Bioinspired Temperature-Responsive Multilayer Films and Their Performance under Thermal Fatigue

Department of Mechanical Engineering and Aeronautics, University of Patras, 26500 Patras, Greece
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Received: 13 June 2018 / Revised: 24 July 2018 / Accepted: 29 July 2018 / Published: 1 August 2018
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Abstract

The structure of certain nonliving tissues determines their self-shaping and self-folding capabilities in response to a stimulus. Predetermined movements are realized according to changes in the environmental conditions due to the generated stresses of the multilayer anisotropic structure. In this study, we present bioinspired responsive anisotropic multilayer films and their fabrication process which comprises low-cost techniques. The anisotropic multilayer materials are capable of deforming their geometry caused by small temperature changes (<40 °C). The mismatch in the thermo-mechanical properties between three or more anisotropic thin layers creates responsive materials that alter their shape owing to the developed internal stresses. The movements of the material can be controlled by forming anisotropic homogenous metallic strips over an anisotropic thermoplastic layer. As a result, responsive multilayer films made of common materials can be developed to passively react to a temperature stimulus. We demonstrate the ability of the anisotropic materials to transform their geometry and we present a promising fabrication process and the thermal fatigue resistance of the developed materials. The thermal fatigue performance is strongly related to the fabrication method and the thickness of the strips. We studied the thermal fatigue performance of the materials and how the thermal cycling affects their sensitivity, as well as their failure modes and crack formation. View Full-Text
Keywords: responsive materials; smart materials; bioinspired materials; nonliving plant tissues; anisotropy; thermal fatigue; microstructure; 4D printing; additive manufacturing responsive materials; smart materials; bioinspired materials; nonliving plant tissues; anisotropy; thermal fatigue; microstructure; 4D printing; additive manufacturing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Athanasopoulos, N.; Siakavellas, N.J. Bioinspired Temperature-Responsive Multilayer Films and Their Performance under Thermal Fatigue. Biomimetics 2018, 3, 20.

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