Analyses on Mechanical Properties of the Cylindrical Double-V Micro-Structure

Gao, Qiang; Wang, Yuanlong; Ma, Zheng-Dong; Zhong, Hong

doi:10.4271/2018-01-0118

Cited by 3 publications

(9 citation statements)

References 22 publications

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“…[39] However, most ZPR behavior has been studied in 2D structures and very few in 3D metamaterials. [40,41] Auxetic geometries have distinct features, including concave arms, experience greater deformations within the elastic range, [42] and have considerably less stiffness than materials with an identical relative density [43] which can be used in a seating base to improve user comfort. [44][45][46] An auxetic metamaterial designed for implementation into furniture to reduce contact stresses and improve user comfort was investigated.…”

Section: Doi: 101002/adem202300356mentioning

confidence: 99%

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Zolfagharian,

Picken,

Bodaghi

et al. 2023

Adv Eng Mater

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This research introduces a novel approach for reducing the vibrations experienced by passengers in vehicles using metamaterials embedded in polyurethane foam to improve the existing vibration isolation capacity of car seats. An exploration of quasi‐zero and negative stiffness metamaterials has been conducted to develop metamaterial springs that exhibit a region of high‐static and low‐dynamic stiffness to achieve vibration isolation. Metamaterials were developed using low‐cost open‐source additive manufacturing methods and thermoplastic polyurethane filament. This investigation followed a process of determining the geometric, material, and systemic design requirements, to identify the quasi‐zero and negative stiffness force‐displacement regions. Small‐scale models of a car seat were developed by embedding the designed metamaterials into different grades of polyurethane foam and completing static and dynamic testing. The results demonstrated practical applications for implementing metamaterial springs into polyurethane foam to enhance vibration isolation under dynamic loading. The developed material library, and the key geometric variables in the metamaterial design allow for application specific solutions where the selection of the appropriate metamaterial and foam combination can be tailored to suit the system requirements.This article is protected by copyright. All rights reserved.

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Section: Doi: 101002/adem202300356mentioning

confidence: 99%

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Zolfagharian,

Picken,

Bodaghi

et al. 2023

Adv Eng Mater

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show abstract

“…Considering morphing applications with actuation in axial and radial directions of the cylinder, three Poisson's ratios of ν ZR , ν RZ and ν θZ are essential to study from an integration perspective. Poisson's ratios ν RZ and ν θZ were defined and the calculation methods were obtained by Gao et al [22]. Similarly, Poisson's ratio ν ZR has an inverse behaviour with ν RZ , where the negative ratio of axial displacement to the radius change of the cylinder, i.e.…”

Section: Zero Poisson Ratio Cylindrical Metamaterial Concept Validationmentioning

confidence: 99%

“…Simulations are investigated by Abaqus V6.18 with Nylon PA2200 material under elastic properties of Poisson's ratio v = 0.4, Young's modulus E = 1130 MPa, Yield stress σ y = 14 MPa and density ρ = 930 kg m −3 . Moreover, the plasticity of the material can be found in the author's previous research [22]. Boundary conditions for analysing Poisson's ratio ν RZ and ν θZ of cylindrical metamaterial with helical cells are presented in figures 2(a) and (b), where the left ends of the models are constrained with all degrees of freedom.…”

Section: Zero Poisson Ratio Cylindrical Metamaterial Concept Validationmentioning

confidence: 99%

“…), where [22]. Moreover, the distance between points BC in figure 2(c) indicates the cylinder axial length change under strain applied on radius direction for Poisson's ratio ν ZR .…”

Section: Zero Poisson Ratio Cylindrical Metamaterial Concept Validationmentioning

confidence: 99%

“…Gao et al [22] presented an analytical method to analyse a cylindrical auxetic microstructure formed by a double-V unit cell exhibiting high stiffness, superior impact resistance and NPR. The chiral structure is one of the most popular designs applied in NPR structures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cylindrical helical cell metamaterial with large strain zero Poisson’s ratio for shape morphing analysis

Qin,

Dayyani

2023

Smart Mater. Struct.

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In this paper, a novel cylindrical metamaterial with helical cell exhibiting zero Poisson’s ratio (ZPR) in two different directions is introduced. Detailed Computer-aided design modelling of a curved optimised spring element is demonstrated for numerical and experimental analysis. High fidelity finite element models are developed to assess the homogenisation study of Poisson’s ratios, normalised Young’s modulus and torsion behaviour, demonstrating the curvature effect and independency of mechanical behaviour of cylindrical optimised spring element metamaterial from tessellation numbers. Buckling and frequency analysis of the cylindrical metamaterial with spring element are compared with equivalent shell cylinders. Moreover, experimental analysis is performed to validate the large strain ZPR and deformation mechanism demonstrated in numerical simulations. Finally, radical shape morphing analysis under different bending conditions for cylindrical metamaterial with helical cell is investigated, including deformation and actuation energy and compared with positive and negative Poisson’s ratio cylinders formed by honeycomb and auxetic cells.

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Structural Mechanics of cylindrical fish-cell zero Poisson’s ratio metamaterials

Qin

Dayyani

Webb

2022

Composite Structures

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Analyses on Mechanical Properties of the Cylindrical Double-V Micro-Structure

Cited by 3 publications

References 22 publications

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Cylindrical helical cell metamaterial with large strain zero Poisson’s ratio for shape morphing analysis

Structural Mechanics of cylindrical fish-cell zero Poisson’s ratio metamaterials

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