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Article
Engineering, Mechanical
Youchuan Zhou et al.
Summary: This study investigates a novel hybrid metamaterial (HMM) fabricated using 3D printing based on selective laser sintering technology, showing potential advantages in wave attenuation and impact mitigation applications. The HMM exhibits a local resonance mechanism and negative Poisson's ratio properties, with bandgaps that can be flexibly tailored by adjusting geometrical configurations. Numerical and experimental exploration of the wave attenuation capacity of the HMM demonstrates its superior performance compared to traditional reentrant structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Review
Chemistry, Physical
Vladislav A. Lvov et al.
Summary: Auxetic metamaterials with a negative Poisson ratio have the properties of lateral expansion when stretched and densification when compressed. Due to their similarity to biological tissues, auxetics have potential applications in the field of medicine. This research study provides a comprehensive overview of auxetic metamaterials in biomedical devices, including prosthetics, orthotics, ergonomic appliances, in vitro medical devices, and tissue engineering scaffolds.
Article
Construction & Building Technology
Ru Zhong et al.
Summary: Auxetic materials and honeycomb sandwich structures exhibit desirable mechanical properties, and a novel concrete composite with auxetic layered honeycomb has been designed and investigated for exploring their load-bearing performance. The results show that the layered structure has higher initial peak stress, stable platform stress, improved shear resistance, and overall stability.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Mechanics
Cang He et al.
Summary: This study introduces a mechanism for manipulating band structures by adjusting string tensions, allowing for the simultaneous shifting of Bragg and local resonance band gaps, as well as achieving ultra-wide band gaps and narrow band filters.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Yi Zeng et al.
Summary: Seismic metamaterials have received significant attention in the past two decades due to their ability to control seismic surface waves. In this study, a new type of seismic metamaterial with a low-frequency bandgap induced by inertial amplification is proposed to isolate seismic surface waves. Experimental results using a metamaterial plate composed of 25 unit cells demonstrate the characteristics of the bandgap induced by inertial amplification. The imaging of flexural waves by a scanning laser Doppler vibrometer shows strong attenuation effects in the bandgap caused by the metamaterial plate. The broadband attenuation is investigated using two different types of unit cells. Finally, similar structures with inertial amplification are introduced to design seismic metamaterials for isolating seismic surface waves at low frequencies.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Jia Lou et al.
Summary: This study investigates the effects of nonlinear metasurfaces consisting of oscillator arrays on the propagation of Rayleigh waves. The results show that nonlinearities have a significant impact on dispersion and harmonic generation, and different types of nonlinearities can alter the frequency band characteristics of the metasurface.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Acoustics
A. Palermo et al.
Summary: This study investigates the propagation of Rayleigh waves in a half-space coupled to a nonlinear metasurface, analyzing the effects of nonlinear interaction force and energy loss on wave dispersion. The research presents closed-form expressions to predict the dispersive characteristics of nonlinear Rayleigh waves, demonstrating how different types of nonlinearity affect spectral gaps in the metasurface and revealing spatial gaps induced by softening nonlinearity in dispersion curves.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Acoustics
Cang He et al.
Summary: This study investigates the effect of taut strings with adjustable tensions on the frequency spectra for elastic waves transmission in a triatomic lattice. The results show that the bandgaps become wider as greater tensions are exerted, and the string-tuning bandgaps can exhibit non-Hermitian form in multi-atomic lattices. The transmission properties and energy distribution of the corresponding finite system composed of such basic units are also analyzed. It is found that when high-amplitude waves enter with strings tightened, the tension and vibrational amplitude have a dual-tuning effect on the bandgaps.
Article
Engineering, Mechanical
Xiao Liang et al.
Summary: This paper introduces a novel hierarchical metamaterial with ultra-broadband vibration suppression property through gradient design. Characterization of a one-dimensional outward-hierarchical lattice system and proposed two gradient design methods to overlap and merge bandgaps.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2022)
Article
Chemistry, Physical
Dorota Pawlus
Summary: This paper evaluates the static stability of complex, composite annular plates with auxetic properties, developing a plate model based on orthogonalization and finite difference methods. The study shows an increase in critical static loads with increasing absolute value of Poisson's ratio of auxetic facings.
Article
Chemistry, Physical
Xin Fang et al.
Summary: This research demonstrates a design paradigm for creating robust robotic metamaterials using versatile gear clusters. The design allows for continuous tuning of elastic properties while maintaining stability and robust maneuverability, even under heavy loads. The gear-based metamaterials offer excellent properties such as tunable Young's modulus, shape morphing, and fast response.
Article
Chemistry, Physical
Julian Plewa et al.
Summary: This paper introduces a type of structures called auxetic tubular structures, which have a negative Poisson's ratio and great potential for various applications. The tubular structures are realized by rolling up planar structures and using rigid square frames as unit cells. Changes in linear dimensions are achieved through a hinge mechanism, and an innovative connection solution is used to connect the square frames.
Review
Chemistry, Physical
Ekaterina Mazur et al.
Summary: Modern additive technologies enable the creation of artificial materials with complex geometry at micro- and nanoscales, leading to properties that differ from conventional materials found in nature. This review focuses on auxetic materials, a class of materials with a negative Poisson's ratio, and compiles research results using analytical, experimental, and numerical methods. Special attention is given to the study of hierarchical auxetic materials, which offer additional advantages such as flexible adjustment of desired mechanical characteristics. The potential biomedical applications of hierarchical auxetic materials, including coronary stents, filtration systems, drug delivery systems, and implants, are highlighted.
Article
Physics, Applied
Jeremy Bonhomme et al.
Summary: The interaction of Love waves with micropillars on the guiding layer surface produces sharp attenuation dips in the transmission spectrum, utilizing the local resonances of the micropillars. These dips are associated with the excitations of flexural and torsional resonance modes of the pillars, enabling higher detection sensitivity for temperature variations and mass loading.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Yi Zeng et al.
Summary: This letter introduces a seismic metamaterial with an ultra-low frequency bandgap induced by inertial amplification. Numerical and experimental results demonstrate that the proposed metamaterial can effectively isolate seismic surface waves. Additionally, an embedded inertial amplification mechanism is introduced on a soil substrate to design a seismic metamaterial capable of attenuating seismic waves around 4Hz.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Civil
Muhammad et al.
Summary: This study proposes two types of engineered resonant metabarrier designs for attenuating ground born vibrations in the subwavelength frequency region, which can potentially be used to protect infrastructures from earthquake hazards. The effectiveness of the metabarriers in attenuating incoming Rayleigh surface waves is investigated through analytical and numerical models, with findings indicating an extremely wide low frequency bandgap for Rayleigh wave attenuation.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Ting Ting Huang et al.
Summary: Seismic metamaterial (SM) has gained significant attention in vibration isolation and damping due to its wave manipulation and bandgap properties. A novel 2D SM composed of auxetic foam and steel is proposed to attenuate seismic waves at ultra-low frequencies. Numerical simulations show that modifying the parameters of the components can enhance the bandgap and effectively attenuate seismic waves, aiming to cover the seismic peak spectrum at 2 Hz.
ENGINEERING STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Qian Wu et al.
Summary: The research investigates non-reciprocal Rayleigh wave propagation in a continuous two-dimensional medium, utilizing a modulated array of spring-mass oscillators to break time-reversal symmetry and reciprocity. Analytical study and numerical simulation are conducted to characterize the propagation and validate dispersion-engineered bandgaps, providing insights for versatile control of Rayleigh wave propagation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Physics, Applied
Nan Gao et al.
Summary: This study focuses on the design of tunable phononic crystal plates with Y-shaped prisms to support valley transport of elastic waves based on an analogy of the quantum valley Hall effect, breaking mirror symmetry to open new bandgaps. By designing interfaces between ETIs with different symmetry-broken geometries, topologically protected edge states are supported. A reconfigurable device for elastic wave channel switching and beam splitting is demonstrated both numerically and experimentally, showing potential for practical applications in broadband elastic wave transmission.
APPLIED PHYSICS LETTERS
(2021)
Article
Acoustics
Vinicius F. Dal Poggetto et al.
Summary: The development of periodic metamaterials for attenuation of low- and mid-frequency range vibrations has been thoroughly studied. In this paper, a ternary periodic metamaterials made of concentric circular inclusions of a rigid material coated with a soft material is investigated, showing the validity of the Mindlin plate model and its potential practical applications.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Materials Science, Multidisciplinary
Liangshu He et al.
Summary: The study demonstrates the inverse design of topological edge states for flexural waves using machine learning method, showing the potential for diverse applications. Through artificial neural networks and nonlinear mapping functions, the design and comparison of topological edge states were achieved, proving that wide bandgaps help confine the topological edge states.
MATERIALS & DESIGN
(2021)
Article
Engineering, Civil
Kai Zhang et al.
Summary: This study investigates the propagation of Lamb waves in seismic metamaterials assembled using periodically arranged cross-like and square steel sections in a soil medium to assess the feasibility of their use for seismic wave attenuation. The results show that seismic metamaterials with three complete band gaps below 20 Hz are of particular interest for low-frequency vibration control, with those composed of square steel sections exhibiting a more favorable performance in terms of wider band gaps. The study provides a new way to build seismic metamaterials by designing the volume fraction and steel section shapes to provide ultra-low and broad-band frequency vibration isolation capabilities that will allow the shielding of seismic waves in specific frequency ranges.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Mechanical
Farhad Zeighami et al.
Summary: The study introduces an original dispersion relation for vertically polarized surface waves in resonant metamaterials, removing the constraint of metasurfaces. It shows the existence of a band gap in the spectrum of Rayleigh surface waves and investigates the impact of resonant layer thickness on frequency stop-band and wave attenuation. The research provides insights into mechanical waves in metamaterials and offers an analytical framework for vertically polarized surface waves in resonant and partially resonant waveguides.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Yijie Liu et al.
Summary: In this study, topological interface states for subwavelength in-plane waves in elastic metamaterials were numerically investigated. The relationships among bandgap, effective mass, and effective stiffness were analyzed, and the manipulation of stop-bands and negative effective parameters by tuning the parameters of translational resonances was discussed. The study observed a topological phase transition from single mass-negative region to single stiffness-negative region, with a corresponding shift in parameter changing of Zak phase. The existence of characteristic behavior of topological interface elastic waves in the sub-wavelength region was confirmed.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Forestry
Muhammad et al.
Summary: This study investigates the seismic mitigation mechanism of clusters of forest trees, achieving a wide locally resonant bandgap through the interaction between Rayleigh waves and trees. It is found that bulky side branches of trees play a positive role in enhancing coupling strength, and the performance and efficiency of the bandgap are validated using a finite element method.
TREES-STRUCTURE AND FUNCTION
(2021)
Article
Physics, Applied
Yi Zeng et al.
Summary: This research investigates the attenuation zones of an elastic metasurface composed of pillars on a substrate. By connecting the characteristics of these two zones, a seismic metasurface using only one kind of artificial structure is designed to attenuate Rayleigh waves in a specific frequency range.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Mechanical
Xinyue Wu et al.
Summary: A new seismic metamaterial is proposed, which broadens the wave attenuation frequency range and shifts it towards lower frequencies through a combination of pillars and core-shell structures. Analysis of the symmetry of the excited Rayleigh wave and the eigenmodes in the dispersion curves shows that the frequency range of efficient wave attenuation in transmission is much wider than that of the corresponding bandgap.
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(2021)
Article
Mechanics
Yi Zeng et al.
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(2020)
Article
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Stephane Brule et al.
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Xingbo Pu et al.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2020)
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Yi Zeng et al.
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(2020)
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Li Ning et al.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
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Jean-Jacques Marigo et al.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2020)
Article
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Yabin Jin et al.
EXTREME MECHANICS LETTERS
(2020)
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Muhammad et al.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2020)
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Yabin Jin et al.
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(2019)
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Yanyu Chen et al.
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Review
Physics, Applied
Guancong Ma et al.
NATURE REVIEWS PHYSICS
(2019)
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Physics, Condensed Matter
Yicai Xu et al.
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(2018)
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H. Nassar et al.
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Sarah Benchabane et al.
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(2017)
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Tatheer Zahra et al.
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(2017)
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Yabin Jin et al.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2017)
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(2017)
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JOURNAL OF APPLIED PHYSICS
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(2016)
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Olly Duncan et al.
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(2016)
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(2015)
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(2014)
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(2014)
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NATURE COMMUNICATIONS
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Qiaoqiang Gan et al.
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