首页|Three-dimensional graded metamaterials with customizable thermal responses under space-variant temperature stimuli

Three-dimensional graded metamaterials with customizable thermal responses under space-variant temperature stimuli

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  • NETL
  • NSTL
  • Elsevier
© 2024 Elsevier LtdMetamaterials with customizable thermal expansions are desirable for important engineering applications. However, existing metamaterials were designed by considering uniform temperature distributions. In the current study, a new design strategy is proposed to develop metamaterials with customizable thermal deformations under space-variant temperature (SVT) stimuli which are non-uniform. Three types of bi-material pyramidal units are first devised through using different material distributions and geometrical configurations. The coefficients of thermal expansion (CTEs) of these units are derived in closed-form expressions. Graded metamaterials are then constructed from the pyramidal units through combined periodic and graded tessellations. Based on targeted thermal deformations under prescribed stimuli, geometrical parameters are identified, and the thermal strains are determined using the newly derived analytical formulas and finite element simulations. The two sets of predictions are found to agree well, which indicates the effectiveness of the new design strategy for the graded metamaterials. The numerical results reveal that the graded metamaterials exhibit customizable uniform deformations under the SVT stimuli. In addition, targeted customizable thermal deformations with quadric-shape strain profiles are achieved in the graded metamaterials. Compared with the conventional design with uniform temperature distributions, the newly proposed design of metamaterials under non-uniform SVT stimuli is more versatile and flexible, thereby providing a systematic strategy for developing graded metamaterials.

Graded designMechanical metamaterialSpace-variant temperature stimuliThermal expansionUniform and non-uniform deformations

Wang K.、Gao X.-L.、Han Z.、Lin F.

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Department of Mechanical Engineering Southern Methodist University

College of Mechanical and Electrical Engineering Hohai University

Geely Innovation Center Geely Holding Group Co. Ltd.

2025

10.1016/j.compstruct.2024.118717

Composite structures

Composite structures

SCI
ISSN：0263-8223
年,卷(期)：2025.353(Jan.)
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