Enhanced thermal expansion by micro-displacement amplifying mechanical metamaterial
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.217
Enhanced thermal expansion by micro-displacement amplifying mechanical metamaterial 1
Lingling Wu, 1 Bo Li, 2* bJi Zhou1* 1
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2
Advanced Materials Institute, Shenzhen Graduate School, Tsinghua University, Shenzhen, China
ABSTRACT It is important to achieve materials with large coefficient of thermal expansion in science and engineering applications. In this paper, we propose an experimentally-validated metamaterial approach to amplify the thermal expansion of materials based on the guiding principles of flexible hinges and displacement amplification mechanism. The thermal expansion property of the designed metamaterial is demonstrated by simulation and experiment with a temperature increase of 245 K for the two-dimensional sample. Both experimental and simulation results display amplified thermal expansion property of the metamaterial. The effective coefficient of thermal expansion of the metamaterials is demonstrated to be dependent on the size parameters of the structure, which means by appropriately tailoring these parameters, the thermal expansion of materials could be amplified with different amplification factor. This work provides an important method to control the thermal expansion coefficient of materials and could be applied in various industry domain.
INTRODUCTION Tunable thermal expansion materials are highly desired in infrastructure engineering and precision instrument manufacturing. However, it is rare to achieve natural material with tailorable coefficient of thermal expansion (CTE). In the past decades, metamaterials have offered an entirely new route to constructing artificial materials with abnormal properties not present in the component materials. Several approaches have been proposed to achieve tunable negative CTE structures [1-6]. Inspired by this designing concept, we supposed that it is feasible to realize the amplification of the CTE of materials by means of metamaterials, which will have great application potentials in devices where materials with large CTE are needed, such as temperature controllers, thermal protectors and so on.
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* Author to whom correspondence should be addressed. Electronic mail: [email protected] *Author to whom correspondence should be addressed. Electronic mail: [email protected]
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In the past decades, the relationships between the effective properties of composite media and its component materials have been widely investigated by researchers [7-9]. It is known that the effective properties of infinite periodic composite materials could be approximately represented by a unit cell [8]. The
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