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

Qin, Qing; Dayyani, Iman; Webb, Philip

doi:10.1016/j.compstruct.2022.115455

Cited by 25 publications

(16 citation statements)

References 29 publications

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“…The external unit cell geometry of the cylindrical metamaterial is auxetic; however, it is indicated from previous research that the rotational displacement occurs due to the presence of a re‐entrant unit cell. [ 30 ] It is believed that due to the cylindrical shape of the auxetic unit cells, under compression, the load paths direct load into the centerband, causing the rotational displacement movement (Appendix 2.1, Supporting Information) ( Figure ).…”

Section: Methodsmentioning

confidence: 99%

“…Due to their complex geometric nature, traditional manufacturing methods were unable to produce these designs in a practical and cost-effective way, with some designs simply being impossible to manufacture. [30] Utilizing AM techniques, metamaterials with highly complex geometries, exploiting zero Poisson ratio (ZPR) and negative Poisson ratio (NPR) geometries, can be manufactured. [31][32][33] Metamaterials have exotic geometries that exploit the Poisson ratio of a re-entrant unit cell [30,34] and can integrate soft and stiff re-entrant unit cells into the same structure.…”

Section: Doi: 101002/adem202300356mentioning

confidence: 99%

“…[30] Utilizing AM techniques, metamaterials with highly complex geometries, exploiting zero Poisson ratio (ZPR) and negative Poisson ratio (NPR) geometries, can be manufactured. [31][32][33] Metamaterials have exotic geometries that exploit the Poisson ratio of a re-entrant unit cell [30,34] and can integrate soft and stiff re-entrant unit cells into the same structure. Poisson's ratio is defined as the ratio between the transverse and axial strains.…”

Section: Doi: 101002/adem202300356mentioning

confidence: 99%

“…[ 37 ] This demonstrates that metamaterials exploiting NPR and ZPR behavior have a good case for application in automotive seating for vibration isolation control to reduce the transmissibility of load and frequencies experienced by the body without concern for space constrains. [ 30 ]…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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: Methodsmentioning

confidence: 99%

Section: Doi: 101002/adem202300356mentioning

confidence: 99%

Section: Doi: 101002/adem202300356mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Zolfagharian,

Picken,

Bodaghi

et al. 2023

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…[33] The changes applied to the structure of metamaterials to convert a positive PR to a negative PR sometimes lead to the creation of a structure with zero Poisson's ratio (ZPR). [34][35][36][37][38][39] These structures have high energy absorption and have been the focus of many researchers in recent years. In this work, the main aim is to investigate the sensitivity of this group of metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Novel Linear Piezo‐resistive Auxetic Meta‐Sensors with Low Young's Modulus by a Core–Shell Conceptual Design and Electromechanical Modelling

Taherkhani,

Bodaghi,

Mousavi Nejad Souq

et al. 2023

Macro Materials & Eng

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Production of piezo‐resistive auxetic sensors is usually carried out through mixing and coating methods. Although these methods are beneficial, Young's modulus of mixed sensors becomes high because of using a high percentage of sensing elements while the durability of coated sensors gets low due to the separation of sensing elements from the sensor surface. This article presents a new core–shell metamaterial model to address the mentioned problems. The shell and the core are produced of polydimethylsiloxane (PDMS) rubber and a mixture of PDMS/graphite powders (73.45 wt% graphite powders), respectively. A finite element model is developed via COMSOL software to predict the electromechanical behaviors of the created sensor and verified by an experimental study. Scanning electron microscope imaging is conducted to detect the separations of the graphite particles. The main important feature of this meta‐sensor is to possess a linear sensitivity due to having zero Poisson's ratio. The advantage of this method is that Young's modulus of the sensor does not decrease (unlike the mixing method), and the sensor‐coated particles do not separate from the sensor after a while (unlike the coating method). The introduced model has advantages that promote potential applications such as using sensory gloves to detect, for instance, human hand movements.

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Shape Morphing of Tubular Structures with Tailorable Mechanical Properties

Zhang,

Krushynska

2023

Adv Eng Mater

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Tubular structures are in high demand in robotics, medicine, and electronics. They are expected to match different shapes under loading and simultaneously exhibit certain mechanical behavior, e.g., specific radial strength and local flexibility, that poses a complex engineering design task. Herein, strategies to achieve programmable shape morphing in patterned tubular structures are explored, whose mechanical properties for all types of deformation modes can be tailored on demand. The general design problem is formulated, and the programmable response for fundamental—expansion, bending, and twisting—modes activated by tension and pressurization is demonstrated. The design problem for expansion modes is solved analytically; the numerical results agree well with the experimental data for stereolithography three‐dimensional printed cellular tubes. The effects of loading and boundary conditions on the deformed shapes and the structural mechanical response are analyzed. Algorithm‐based design strategies are proposed to achieve quantitative and automatic design for complex deformation modes. The possible use of the proposed structures is also discussed with respect to several applications. The findings pave the way for multifunctional tubular structures by exploring the pluridimensional space of the geometric parameters of metamaterial patterns.

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

Cited by 25 publications

References 29 publications

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Additive Manufacturing of Composite Foam Metamaterial Springs for Vibration Isolation

Novel Linear Piezo‐resistive Auxetic Meta‐Sensors with Low Young's Modulus by a Core–Shell Conceptual Design and Electromechanical Modelling

Shape Morphing of Tubular Structures with Tailorable Mechanical Properties

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