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In-plane and out-of-plane quasi-static compression performance enhancement of 3D printed re-entrant diamond auxetic metamaterial with geometrical tuning and fiber reinforcement

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Defence Technology(防务技术) 2023年第7期25卷 1-17页

作者： Niranjan Chikkanna Shankar Krishnapillai Velmurugan Ramachandran Department of mechanical Engineering Indian Institute of Technology Madras600036India Department of Aerospace Engineering Indian Institute of Technology Madras600036India

Auxetic materials are cellular materials with a unique property of negative Poisson’s *** auxeticity and performance of these metamaterials utterly depend on the geometrical parameters and loading *** the first time,the quasi-static uniaxial compression performance of fused filament fabricated re-entrant diamond auxetic metamaterial is evaluated in the x-direction(in-plane)and z-direction(out-of-plane).The most commonly used thermoplastic feedstock,Acrylonitrile butadiene styrene,is considered a material of *** effect of influential geometrical parameters of the re-entrant diamond structure and printing parameter is systematically studied using Taguchi’s design of ***-based multi-objective optimisation technique has been adopted to arrive at the optimal *** are made to improve the stiffness and strength of the structure with fibre *** glass fibre reinforcements have enhanced specific strength and stiffness in both in-plane and out-ofplane directions.A sevenfold and thirteen times increase in specific strength and energy absorption is evident for glass fibre-reinforced structures in out-of-plane directions compared to in-plane *** tuning of geometrical parameters of the re-entrant diamond structure can result in a Poisson’s ratio of up to-3.49 when tested in the *** parametric study has illustrated the tailorability of the structure according to the application *** statistical study has signified each considered parameter’s contribution to the compression performance characteristics of the 3D printed re-entrant diamond auxetic metamaterial.

关键词： Auxeticity Fibre reinforcement Tailorability Anisotropy Geometrical influence Property enhancement

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Optomechanical soft metamaterials

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Acta Mechanica Sinica 2017年第3期33卷 575-584页

作者： Xiangjun Peng Wei He Yifan Liu Fengxian Xin Tian Jian Lu State Key Laboratory for Strength and Vibration of mechanical Structures Xi'an Jiaotong University MOE Key Laboratory for Multifunctional Materials and Structures Xi'an Jiaotong University

We present a new type of optomechanical soft metamaterials, which is different from conventional mechanical metamaterials, in that they are simple isotropic and homogenous materials without resorting to any complex nano/microstructures. This metamaterial is unique in the sense that its responses to uniaxial forcing can be tailored by programmed laser inputs to manifest different nonlinear constitutive behaviors, such as monotonic, S-shape, plateau, and non-monotonic snapping performance. To demonstrate the novel metamaterial, a thin sheet of soft material impinged by two counterpropagating lasers along its thickness direction and stretched by an in-plane tensile mechanical force is considered. A theoretical model is formulated to characterize the resulting optomechanical behavior of the thin sheet by combining the nonlinear elasticity theory of soft materials and the optical radiation stress theory. The optical radiation stresses predicted by the proposed model are validated by simulations based on the method of finite elements. Programmed optomechanical behaviors are subsequently explored using the validated model under different initial sheet thicknesses and different optical inputs, and the first- and second-order tangential stiffness of the metamaterial are used to plot the phase diagram of its nonlinear constitutive behaviors. The proposed optomechanical soft metamaterial shows great potential in biological medicine, microfluidic manipulation, and other fields.

关键词： Optomechanics Soft metamaterial Optical radiation stress Programmable constitutive relation

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Self-folding mechanics of graphene tearing and peeling from a substrate

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Frontiers of physics 2018年第3期13卷 17-28页

作者： Ze-Zhou He Yin-Bo Zhu Heng-An Wu CAS Key Laboratory of mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

Understanding the underlying mechanism in the tearing and peeling processes of graphene is crucial for the further hierarchical design of origami-like folding and kirigami-like cutting of graphene. How- ever, the complex effects among bending moduli, adhesion, interlayer interaction, and local crystal structure during origami-like folding and kirigami-like cutting remain unclear, resulting in challenges to the practical applications of existing theoretical and experimental findings as well as to potential manipulations of graphene in metamaterials and nanodevices. Toward this end, classical molecular dynamics （MD） simulations are performed with synergetie theoretical analysis to explore the tearing and peeling of self-folded graphene from a substrate driven by external force and by thermal activation. It is found that the elastic energy localized at the small folding ridge plays a significant role in the crack trajectory. Due to the extremely small bending modulus of monolayer graphene, its taper angle when pulled by an external force follows a scaling law distinct from that in case of bilayer graphene. With the increase in the initial width of the folding ridge, the self-folded graphene, motivated by thermal fluctuations, can be self-assembled by spontaneous self-tearing and peeling from a substrate. Simultaneously, the scaling law between the taper angle and adhesive energy is independent of the motivations for thermal activation-induced self-assembly and external force tearing, providing effective insights into the underlying physics for graphene-based origami-like folding and kirigami-like cutting.

关键词： graphene tearing self-assembly elastic energy molecular dynamics simulation

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Microstructural designs of plate-type elastic metamaterial and their potential applications: a review

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International Journal of Smart and Nano Materials 2015年第1期6卷 14-40页

作者： R.Zhu X.N.Liu G.K.Hu F.G.Yuan G.L.Huang Department of mechanical and Aerospace Engineering North Carolina State UniversityRaleighNC 27695USA School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Department of mechanical and Aerospace Engineering University of MissouriColumbiaMO 65211USA

Elastic metamaterials are of growing interest due to their unique effective properties and wave manipulation *** phononic crystals based on the Bragg scattering mechanism,elastic metamaterials(EMMs)are based on the locally resonant(LR)mechanism and can fully control elastic waves at a subwavelength *** designs of EMMs in plate-like structures have attracted a great deal of *** this paper,the recent advances in the microstructural designs of LRbased EMM plates are *** potential applications in the fields of low frequency guided wave attenuation,wave manipulation and energy trapping at a subwavelength scale,and structural health monitoring are discussed.

关键词： metamaterial composite structural dynamics nondestructive evaluation structural health monitoring

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Engineering the Input Impedance of Electric Planar metamaterials Analogue of Dipole Array

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Chinese Physics Letters 2014年第11期31卷 148-151页

作者：朱言午邱扬刘琦 Domenic Belgiovane School of Electro-mechanical Engineering Xidian University Xian 710071 The ElectroScience Laboratory Department of Electrical and Computer Engineering The Ohio State University Columbus 43212 USA

Since the demand of metamaterial （MM） based devices for practical applications is increased, the method with input impedance of dipole aims to produce fast results with reasonable accuracy for its design proposed. In this work, the unit of MM is equivalent to a dipole and then MM could be treated as a dipole array. An analysis is performed based on classical microwave dipole and numerical simulation by using the finite-difference time- domain for different MM configurations in the form of dipoles array. Additionally, a quality factor （Q-factor） based analysis is shown to yield simulation results which are in good agreement with the experiment. In essence, this shows that we could use antenna theory and numerical method to analyze MM thus opening the doors for a more efficient parameter optimization method.

关键词： metamaterials DIPOLE array antennas QUALITY factor FINITE difference time domain method ELECTROMAGNETIC devices

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Encoding reprogrammable properties into magneto-mechanical materials via topology optimization

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npj Computational Materials 2023年第1期9卷 1770-1780页

作者： Zhi Zhao Xiaojia Shelly Zhang Department of Civil and Environmental Engineering University of Illinois Urbana-ChampaignUrbanaILUSA Department of mechanical Science and Engineering University of Illinois Urbana-ChampaignUrbanaILUSA

The properties of materials and structures typically remain fixed after being designed and *** is a growing interest in systems with the capability of altering their behaviors without changing geometries or material constitutions,because such reprogrammable behaviors could unlock multiple functionalities within a single *** introduce an optimization-driven approach,based on multi-objective magneto-mechanical topology optimization,to design magneto-active metamaterials and structures whose properties can be seamlessly reprogrammed by switching on and off the external stimuli *** optimized material system exhibits one response under pure mechanical loading,and switches to a distinct response under joint mechanical and magnetic *** discover and experimentally demonstrate magneto-mechanical metamaterials and metastructures that realize a wide range of reprogrammable responses,including multi-functional actuation responses,adaptable snap-buckling behaviors,switchable deformation modes,and tunable *** proposed approach paves the way for promising applications such as magnetic actuators,soft robots,and energy harvesters.

关键词： deformation optimization topology

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Broadband impedance modulation via non-local acoustic metamaterials

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National Science Review 2022年第8期9卷 47-54页

作者： Zhiling Zhou Sibo Huang Dongting Li Jie Zhu Yong Li Institute of Acoustics School of Physics Science and EngineeringTongji University Department of mechanical Engineering The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute

Causality of linear time-invariant systems inherently defines the wave-matter interaction process in wave physics. This principle imposes strict constraints on the interfacial response of materials on various physical platforms. A typical consequence is that a delicate balance has to be struck between the conflicting bandwidth and geometric thickness when constructing a medium with desired impedance, which makes it challenging to realize broadband impedance modulation with compact structures. In pursuit of improvement, the over-damped recipe and the reduced excessive response recipe are creatively presented in this work. As a proof-of-concept demonstration, we construct a metamaterial with intensive mode density that supports strong non-locality over a frequency band from 320 Hz to 6400 Hz. Under the guidelines of the over-damped recipe and the reduced excessive response recipe, the metamaterial realizes impedance matching to air and exhibits broadband near-perfect absorption without evident impedance oscillation and absorption dips in the working frequency band. We further present a dual-functional design capable of frequency-selective absorption and reflection by concentrating the resonance modes in three frequency bands. Our research reveals the significance of over-damped recipe and the strong non-local effect in broadband impedance modulation, which may open up avenues for constructing efficient artificial impedance boundaries for energy absorption and other wave manipulation.

关键词： impedance modulation acoustic absorption non-local metamaterials

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Circular dichroism-like response of terahertz wave caused by phase manipulation via all-silicon metasurface

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Photonics Research 2021年第4期9卷 567-573页

作者： Jie Li Chenglong Zheng Guocui Wang Jitao Li Hongliang Zhao Yue Yang Zhang Zhang Maosheng Yang Liang Wu Jining Li Yating Zhang Yan Zhang Jianquan Yao Key Laboratory of Opto-Electronics Information Technology(Tianjin University) Ministry of EducationSchool of Precision Instruments and Opto-Electronics EngineeringTianjin UniversityTianjin 300072China Beijing Key Laboratory for metamaterials and Devices Key Laboratory of Terahertz OptoelectronicsMinistry of Educationand Beijing Advanced Innovation Center for Imaging TechnologyDepartment of PhysicsCapital Normal UniversityBeijing 100048China Beijing Engineering Research Center for Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China School of mechanical Engineering Jiangsu UniversityZhenjiang 225009China

Chiral metasurfaces based on asymmetric meta-atoms have achieved artificial circular dichroism(CD),spin-dependent wavefront control,near-field imaging,and other spin-related electromagnetic *** this paper,we propose and experimentally verify a scheme for achieving high-efficiency chiral response similar to CD of terahertz(THz)wave via phase *** introducing the geometric phase and dynamic phase in an all-silicon metasurface,the spin-decoupled terahertz transmission is *** giant circular dichroism-like effect in the transmission spectrum is observed by using a random phase distribution for one of the circular polarization *** importantly,the effect can be adjusted when we change the area of the metasurface illuminated by an incident terahertz *** addition,we also demonstrate the spin-dependent arbitrary wavefront control of the transmitted terahertz wave,in which one of the circularly polarized components is scattered,while the other forms a focused vortex *** and experimental results show that this method provides a new idea for spin selective control of THz waves.

关键词： circular phase wave

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Notch Flexure as Kirigami Cut for Tunable mechanical Stretchability towards Metamaterial Application

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International Journal of Smart and Nano Materials 2022年第2期13卷 203-217页

作者： Yanqi Yin Yang Yu Bo Li Guimin Chen State Key Laboratory of Manufacturing System Engineering Shaanxi Key Laboratory of Intelligent RobotsSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anShaanxiChina

Kirigami is an art of paper cutting,which can be used in mechanical metamaterials,actuators,and energy absorption based on its deployable and load-deflection *** cuts with zero width produce undesirable plastic deformation or even tear fracture due to stress concentration in *** study proposes to enlarge the cut width into a notch flexure,which is applied to an orthogonality-cutted kirigami sheet,which buckles out of plane into a 3D configuration patterns under uniaxial *** use of compliant beam as the notch makes the stress distribution around the cuts more uniform in both elastic and elastoplastic *** experimental and numerical results show that by tuning the geometric parameters of cuts and material properties of the sheets,the trigger condition of 3D patterns can be *** capability of tunable phononic wave propagation in this kirigami-inspired metamaterial is *** design methodology offers a theoretical guide for kirigami-based structures.

关键词： Kirigami design compliant mechanism flexural hinge mechanical metamaterials buckling instability

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A Novel Application of Multi-Resonant Dissipative Elastic Metahousing for Bearings

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Acta Mechanica Solida Sinica 2021年第4期34卷 449-465页

作者： Muhammad C.W.Lim N.S.Vyas Department of Architecture and Civil Engineering City University of Hong KongKowloonHong Kong SARChina Department of mechanical Engineering Indian Institute of Technology KanpurKanpur208016India

Bearing as an important machine element is widely used for industrial and automotive *** certain operational speed,bearings induce disturbing vibrations and noises that affect machine service life,productivity and passenger comfort in case of vehicle *** elastic metamaterials have caught considerable attention of scientific community due to their effective medium properties and peculiar dynamic characteristics including frequency bandgaps that can be effectively applied to attenuate and control undesirable vibration and *** a substantial amount of theoretical work for effective medium characteristics and dynamic properties of acoustic/elastic metamaterials has been reported,the practical design and application of these composite structures for real-life engineering problems still remain *** present study intends to investigate a potential application of dissipative elastic metamaterials in controlling the bearing-generated vibration and noises over an ultrawide frequency *** study is based on a simple analytical model together with rigorous finite element numerical *** has been established that the dissipative characteristic of resonant system caused by larger material mismatch broadens the local resonance bandgaps beyond the bounding resonance frequency at the cost of wave *** order to achieve broadband vibration and noise control,multi-resonant composite structures are embedded inside the bearing housing in five different *** reported results revealed the presence of broadband wave attenuation zone distributed from 3 to 52 kHz with consideration of material *** bearing-generated vibration and noises lying inside the wave attenuation zone will be *** feasibility study provides a new concept for the design and application of acoustic/elastic metamaterials in the bearing industry to improve machine service life and to enhance productivity and passenger comfo

关键词： Bearing metahousing Dissipative elastic metamaterials Frequency Local resonance bandgap Vibration attenuation zone

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