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Enhanced thermal expansion by micro-displacement amplifying mechanical metamaterial

Published online by Cambridge University Press:  26 February 2018

Lingling Wu,
Bo Li and
Ji Zhou
Lingling Wu
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Bo Li*
Affiliation:
Advanced Materials Institute, Shenzhen Graduate School, Tsinghua University, Shenzhen, China
Ji Zhou*
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
*
*Author to whom correspondence should be addressed. Electronic mail: boli@mail.tsinghua.edu.cn
* Author to whom correspondence should be addressed. Electronic mail: zhouji@tsinghua.edu.cn
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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.

Keywords

thermal stressesmechanical alloyingsimulation

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Type
Articles
Information
MRS Advances , Volume 3 , Issue 8-9: Theory, Characterization and Modeling , 2018, pp. 405 - 410
Copyright
Copyright © Materials Research Society 2018 

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References

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