An Auxetic Material With Negative Coefficient of Thermal Expansion and High Stiffness

Huang, Jingxiang; Li, Weihua; Chen, Mingming; Fu, Minghui

doi:10.1007/s10443-021-09983-y

Cited by 15 publications

(1 citation statement)

References 38 publications

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“…The first involves incorporating active components and clever kinematics to convert local axial expansions into macroscopic shrinkage. Examples of such designs include both two and threedimensional structures formed using dual-material triangles [38][39][40][41] and dual-material tetrahedrons [42,43] respectively. The second mechanism involves introducing bi-material strips to replace certain members of the structure, resulting in bending and a negative response [18,[44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Design of auxetic cellular structures for in-plane response through out-of-plane actuation of stimuli-responsive bridge films

Chandramouli,

Rapaka,

Annabattula

2024

Smart Mater. Struct.

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In this work, we propose novel designs of cellular structures exhibiting unconventional in-plane actuation responses to external stimuli. We strategically introduce stimuli-responsive bilayer bridge films within conventional honeycombs to achieve the desired actuation. The films are incorporated such that, in response to an external field (thermal, electric, chemical, etc.), the bridge film bends out-of-plane, activating the honeycomb in the plane. The conventional out-of-plane deformation of the bridge film can lead to interesting and unconventional actuation in the plane. An analytical model of this coupled unit cell behaviour is developed using curved beam theory, and the model is validated against finite element simulations. Several applications of such designs are presented. Unit cell architectures exhibiting both positive and negative macroscopic actuation are proposed, and the criterion for achieving such actuation is derived analytically. Furthermore, we demonstrate that by altering the topology, unidirectional and bidirectional negative actuation can be achieved. We also propose designs that result in the negative actuation of the structure with both monotonically increasing and monotonically decreasing stimuli. Finally, by combining two macroscopic structures with positive and negative actuation, we design actuators/sensors that bend in the plane in response to a stimulus.

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Section: Introductionmentioning

confidence: 99%

Design of auxetic cellular structures for in-plane response through out-of-plane actuation of stimuli-responsive bridge films

Chandramouli,

Rapaka,

Annabattula

2024

Smart Mater. Struct.

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Thermal–mechanical metamaterial analysis and optimization using an Abaqus plugin

Fong,

Koponen,

Omairey

et al. 2023

Engineering with Computers

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This paper demonstrates how commercial finite-element software and optimization algorithms can be combined to fully explore the design space of thermal–mechanical metamaterials to reveal trends and new insight. This is achieved by developing an Abaqus plugin (EasyPBC) that automates the application of periodic boundary conditions and computes effective elastic and thermal expansion properties for 2D and 3D problems. Abaqus is then linked to an optimizer to fully explore the design space and optimal trade-off between thermal and mechanical properties for two example metamaterials. The first example is a auxetic 2D star-shaped metamaterial, where the proposed approach is used to create a design envelope for Poisson’s ratio and thermal expansion coefficient by solving a series of constrained optimization problems. The second example is a 3D metamaterial based on an octet truss, with additional members to expand the design space. A multi-objective optimization problem is solved to find the optimal trade-off between Young’s modulus and thermal expansion coefficient in a prescribed direction. The results of both examples expand our knowledge about the range of properties for these metamaterials, and designs for optimal trade-off between thermal and mechanical properties.

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Temperature and strain induced switching in the thermal expansion behaviours of 2D SiH and GeH monolayers: An account from first-principle DFT and ab initio molecular dynamics studies

Banik,

Ghosh,

Chowdhury

2025

Computational Materials Science

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An Auxetic Material With Negative Coefficient of Thermal Expansion and High Stiffness

Cited by 15 publications

References 38 publications

Design of auxetic cellular structures for in-plane response through out-of-plane actuation of stimuli-responsive bridge films

Design of auxetic cellular structures for in-plane response through out-of-plane actuation of stimuli-responsive bridge films

Thermal–mechanical metamaterial analysis and optimization using an Abaqus plugin

Temperature and strain induced switching in the thermal expansion behaviours of 2D SiH and GeH monolayers: An account from first-principle DFT and ab initio molecular dynamics studies

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