Tunable elastic wave propagation in planar functionally graded metamaterials

Sepehri, Soroush; Jafari, Hamid; Mashhadi, Mahmoud Mosavi; Yazdi, Mohammad Reza Hairi; Fakhrabadi, Mir Masoud Seyyed

doi:10.1007/s00707-020-02705-8

Cited by 33 publications

(5 citation statements)

References 55 publications

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“…According to several parametric design studies [ 43 , 55 ] in wave propagation and bandgap analysis, it is important to analyze the coverage percentages of the filtering area. Figure 5 b depicts the variation of bandgap coverage between the frequency range

.…”

Section: Resultsmentioning

confidence: 99%

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Jafari

2023

Polymers

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This study aims to enhance and tune wave-propagation properties (Bandgaps) of periodic structures featuring magnetorheological elastomers (MREs). For this purpose, first, a basic model of periodic structures (square unit cell with cross-shaped arms), which does not possess noise filtering properties in the conventional configuration, is considered. A passive attenuation zone is then proposed by adding a cylindrical core mass to the center of the conventional geometry and changing arm angles, which permitted new bandgap areas. It was shown that better wave-filtering performance may be achieved by introducing a large radius of the cylindrical core as well as low negative cross-arm angles. The modified configuration of the unit cell was subsequently utilized as the basic model for the development of magnetoactive metamaterial using a MRE capable of varying the bandgaps areas upon application of an external magnetic field. The finite element model of the proposed MRE-based periodic unit cell was developed, and the Bloch theorem was employed to systematically investigate the ability of the proposed adaptive periotic structure to attenuate low-frequency noise and vibration. Results show that the proposed MRE-based periodic wave filter can provide wide bandgap areas which can be adaptively changed and tuned using the applied magnetic field. The findings in this study can provide an essential guide for the development of novel adaptive periodic structures to filter low-frequency noises in the wide frequency band.

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.…”

Section: Resultsmentioning

confidence: 99%

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Jafari

2023

Polymers

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“…a rugate filter [40]), or at microwave frequencies using metamaterial building blocks [41,42]. It is also worth noting that these profiles are not limited to EM materials, but could be realised with graded elastic media [43,44].…”

Section: Factorisation Methodsmentioning

confidence: 99%

Supersymmetry, half-bound states, and grazing incidence reflection

Patient

Horsley

2021

J. Opt.

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Electromagnetic waves at grazing incidence onto a planar medium are analogous to zero energy quantum particles incident onto a potential well. In this limit waves are typically completely reflected. Here we explore dielectric profiles supporting optical analogues of 'half-bound states', allowing for zero reflection at grazing incidence. To obtain these profiles we use two different theoretical approaches: supersymmetric quantum mechanics, and direct inversion of the Helmholtz equation, showing that discretized approximations to these profiles exhibit low reflectivity close to grazing incidence.

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“…Hence, future investigations should focus on overcoming these issues and providing comprehensive databases; improving techniques and related computer models, software, etc. ; fabrication of modern devices; enhancing the compatibility of these parts with the entire system both biologically and mechanically; improving the fabrication resolution with the capacity to produce slight gradations; finding new methods to carefully tailor the distribution of phases, pores, and other constituents; upgrading the utilized materials; application of new concepts such as 4-D designs (Javaid and Haleem, 2019); bioprinting (Dwivedi and Mehrotra, 2020); metamaterials (Zhu et al, 2019;Sepehri et al, 2020); and so on. In this regard, considering the great impact of AM technology, it should be further developed because it still is not applicable in real industrial conditions.…”

Section: Future Scenerymentioning

confidence: 99%

Functional Gradient Metallic Biomaterials: Techniques, Current Scenery, and Future Prospects in the Biomedical Field

Shi

Zhou

et al. 2021

Front. Bioeng. Biotechnol.

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Functional gradient materials (FGMs), as a modern group of materials, can provide multiple functions and are able to well mimic the hierarchical and gradient structure of natural systems. Because biomedical implants usually substitute the bone tissues and bone is an organic, natural FGM material, it seems quite reasonable to use the FGM concept in these applications. These FGMs have numerous advantages, including the ability to tailor the desired mechanical and biological response by producing various gradations, such as composition, porosity, and size; mitigating some limitations, such as stress-shielding effects; improving osseointegration; and enhancing electrochemical behavior and wear resistance. Although these are beneficial aspects, there is still a notable lack of comprehensive guidelines and standards. This paper aims to comprehensively review the current scenery of FGM metallic materials in the biomedical field, specifically its dental and orthopedic applications. It also introduces various processing methods, especially additive manufacturing methods that have a substantial impact on FGM production, mentioning its prospects and how FGMs can change the direction of both industry and biomedicine. Any improvement in FGM knowledge and technology can lead to big steps toward its industrialization and most notably for much better implant designs with more biocompatibility and similarity to natural tissues that enhance the quality of life for human beings.

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Tunable elastic wave propagation in planar functionally graded metamaterials

Cited by 33 publications

References 55 publications

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Analysis of an Adaptive Periodic Low-Frequency Wave Filter Featuring Magnetorheological Elastomers

Supersymmetry, half-bound states, and grazing incidence reflection

Functional Gradient Metallic Biomaterials: Techniques, Current Scenery, and Future Prospects in the Biomedical Field

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