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Mechanical metamaterials based on snap-through instability structures:classification,applications,and prospects 认领 引用 被引量：1
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作者 Chengbin Yue Liwu Liu +1 位作者 Yanju Liu Jinsong Leng 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第1期269-310,共42页
Snap-through instability-based mechanical metamaterials(SIMMs)with bistability,multistability,negative stiffness,or excellent energy absorption and dissipation performance play an important role in various advanced fu... Snap-through instability-based mechanical metamaterials(SIMMs)with bistability,multistability,negative stiffness,or excellent energy absorption and dissipation performance play an important role in various advanced functional applications.They can serve as energy absorbers,energy dampers,or mechanical memory and logic computing devices,while also providing amplified force output and faster response time in flexible robots,or implementing sensing functions combined with piezoelectric or triboelectric electricity.However,thus far,research on SIMMs that have non-fixed boundary constraints,proactive responsiveness,multi-physical field cross-coupling,and deep information processing capabilities is still facing significant challenges,potentially hindering the development and cross-field comprehensive applications of truly intelligent SIMMs.Our objective is to furnish a concise categorization of SIMMs and offer direction for innovative design and functional implementations.We have emphasized that the non-fixed boundary constraint will expand the design possibilities,while the use of stimulus-responsive materials and 4D printing technology will create novel opportunities for the design of SIMMs.These advancements are expected to achieve innovative mechanical properties and functions. 展开更多
关键词 snap-through instability mechanical metamaterials 4D printing variable boundary constraints
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Exploring the bending behavior of 3D star-shaped auxetic metamaterials for morphing airfoil applications 认领 引用
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作者 Yuliang Hou Zhi Huang +3 位作者 Bin Fan Xiaojun Gu Liang Meng Liang Xia 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第6期155-168,共14页
This study comprehensively investigates the bending behavior of 3D star-shaped auxetic(3D-SAU)metamaterials,which exhibit a distinctive negative Poisson's ratio(NPR)effect along three orthogonal spatial directions... This study comprehensively investigates the bending behavior of 3D star-shaped auxetic(3D-SAU)metamaterials,which exhibit a distinctive negative Poisson's ratio(NPR)effect along three orthogonal spatial directions.Parametric analysis reveals that the out-of-plane NPR effect is significantly enhanced by increasing the hexagon side length(l),whereas reduced by increasing the offset angle(α)or interlayer spacing(h).Results extracted from experimental and numerical three-point bending tests indicate that auxetic(3D-SAU and 3D-RE)metamaterials exhibit 3.5 times to 10.7 times higher bending compliance than the traditional BCC one,due to their distinct deformation modes under bending loads.Notably,the architecture of the 3D-SAU unit cell,featuring reversely staggered star-shaped frames,facilitates a unique deformation mechanism dominated by rod rotation,thereby ensuring the metamaterial's superior structural compliance under bending loads.Furthermore,the potential application is explored by integrating 3D-SAU metamaterials into morphing airfoils actuated by shape memory alloy(SMA)skins.A functionally-graded design for the unit cell'sα,has been introduced to enable controllable and localized deformation of the airfoil profile.Through a combined experimental and numerical approach,it is found that the 3D-SAU metamaterials not only achieve exceptional deformability but also effectively reduce stress concentration through its tailored compliance.This study establishes a novel design framework for high-performance morphing airfoils that achieves a synergy between large,controllable shape adaptation with inherent impact-resistance for advanced aerospace applications. 展开更多
关键词 3D star-shaped auxetic metamaterials Bending behavior Metamaterial beams Morphing airfoils Shape memory alloys
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A satellite layout-structure integrated optimization method based on thermal metamaterials 认领 引用
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作者 Senlin HUO Bingxiao DU +2 位作者 Wei CONG Yong ZHAO Xianqi CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期328-340,共13页
In the conceptual design phase of the satellite thermal management system,components layout optimization and structural topology optimization of satellite panel can meet global and local thermal management requirement... In the conceptual design phase of the satellite thermal management system,components layout optimization and structural topology optimization of satellite panel can meet global and local thermal management requirements,respectively.However,achieving non-interfering coupling between these two optimization processes remains a challenge.An integrated layout-structure design method based on thermal metamaterials is proposed,which comprises two design stages.In the first stage,components layout optimization is conducted to maximize temperature uniformity within the satellite module,yielding a globally optimized layout with balanced thermal characteristics.In the second stage,topology optimization guided by the design principle of thermal metamaterials is implemented in critical local panel regions to satisfy differentiated heat transfer requirements of components with diverse functional and thermal sensitivity properties.The key innovation lies in utilizing thermal metamaterials as a mediator to synergistically couple global components layout optimization with local structural topology optimization,which enables customized local heat flux manipulation without interfering with the globally optimized temperature field derived from the layout optimization.The method introduces neither additional mass nor special materials,offering advantages of low cost,high reliability,and strong versatility.It provides a new solution paradigm for the design of passive thermal management systems in satellites. 展开更多
关键词 Layout optimization Metamaterials Satellites Structure design Thermal management Topology optimization
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Design and mechanical characterization of discretely assembled mechanical metamaterials for macroscale applications 认领 引用
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作者 Zhengtao Shu Ying Zhou +2 位作者 Junjian Fu Hao Li Liang Gao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第2期80-94,共15页
Manufacturing large-scale mechanical metamaterials(MMs) is extremely challenging owing to the limitations of machining technology and equipment.This study proposes a family of discretely assembled MMs to address this ... Manufacturing large-scale mechanical metamaterials(MMs) is extremely challenging owing to the limitations of machining technology and equipment.This study proposes a family of discretely assembled MMs to address this issue.In this work,six types of MM unit cells are divided into several face blocks,which can be mass-produced by traditional low-cost manufacturing processes.The discrete face blocks are then assembled using connectors and fasteners to form a unit cell.These assembled unit cells can be further discretely assembled for modular constructions and reconfigurable MM structure systems.The results show that the discretely assembled MMs exhibit excellent mechanical properties such as high stiffness,compression resistance,and auxetic and chiral behaviors.In addition,two typical application scenarios and an example show that the discrete assembly strategy provides accessibility for the heterogeneous and multi-material assemblies of MMs.The discrete assembly strategy,benefiting from the incremental assembly feature,is proven to be a low-cost and highly repeatable forming process.It provides scalability and functionality that are not achievable with traditional manufacturing techniques.Combined with advanced design methods and automated assembly processes,discretely assembled MMs will be significant in future intelligent structures,soft robotics,and aerospace. 展开更多
关键词 Discrete assembly Mechanical metamaterials Modular and reconfigurable system Mass production Large-scale forming
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Laser printed bio-inspired active flexible metallic metamaterials with reconfigurable deformation capability 认领 引用
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作者 Wenxin Chen Dongdong Gu +5 位作者 Xin Liu Yu Sun Jianfeng Sun Fangyan Su Jinwen Zou Yusheng Chen 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期575-590,共16页
Metamaterials are excellent candidates for application in smart morphing aircraft owing to their high designability,excellent mechanical and functional properties.However,existing designs often utilize passive structu... Metamaterials are excellent candidates for application in smart morphing aircraft owing to their high designability,excellent mechanical and functional properties.However,existing designs often utilize passive structures and polymer-based materials,limiting the lightweight and strength of the morphing wings.Hence,we proposed a novel active flexible metal metamaterial inspired by the embedded characteristics and wavy interfaces of epidermal cells in the Portulaca oleracea seedcoat,with network honeycomb configuration.The formability,mechanical properties,deformation mechanisms,and the shape memory effect(SME) of network honeycombs manufactured by laser powder bed fusion(LPBF) were systematically investigated.By regulating the number of cell walls per junction,network honeycombs achieved tunable mechanical properties with the Poisson's ratio ranging from -0.21 to +0.47.The hexagonal network honeycombs(HNHs) demonstrated a fracture strain up to 38% and achieved an excellent shape recovery ratio of 96.10% under thermal activation with 10% pre-programmed strain.The reconfigurable deformation capability of the biomimetic metamaterial was demonstrated in morphing wings within a wide application temperature range,enabling smooth and continuous deformation within a range of -25° to 25°.This study highlights the integration of shape memory alloy to endow metamaterials with active and reconfigurable properties,advancing the engineering applications of smart morphing aircrafts. 展开更多
关键词 smart morphing wings laser powder bed fusion deformation recovery capability biomimetic metamaterials shape memory alloy
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Frequency-Selective Transmission Control of Ultrasonic Guided Waves in T-Shaped Pipes Using Acoustic Metamaterials:Computer Modeling and Experimental Validation 认领 引用
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作者 Weiguo Chen Xiaobin Hong +2 位作者 Kai Chen Yunyun Deng Bin Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第6期371-401,共31页
Structural health monitoring(SHM)of ship piping systems is a core component of predictive maintenance strategies for complex marine engineering systems.During the detection of ship T-shaped pipes using ultrasonic guid... Structural health monitoring(SHM)of ship piping systems is a core component of predictive maintenance strategies for complex marine engineering systems.During the detection of ship T-shaped pipes using ultrasonic guided waves,signal overlap arises from the diffusion of guided wave branches.To address this issue,an intelligent waveguidance mechanism based on acoustic metamaterials is proposed for dynamic propagation control of ultrasonic guided waves.First,a metamaterial unit composed of a stainless steel substrate and a copper column is designed.The control of bandgap characteristics by lattice constant,column diameter,and column height is systematically investigated,and a design range of structural parameters with optimal bandgap is obtained.The particle swarm optimization algorithm is used to design and optimize two metamaterials,Acoustic-metamaterials-1(AMs-1)and Acoustic-metamaterials-2(AMs-2),which further improve the bandgap performance and achieve a transmission loss of over 30 dB for guided waves at 100 and 150 kHz,respectively.Simulation and experimental verification show that when AMs-1 and AMs-2 are deployed in the left and right branches of the T-shaped pipe,respectively,wave propagation can be achieved according to the excitation frequency.At 1oo kHz excitation,the guided wave preferentially propagates along the right branch,while at 150 kHz excitation,it preferentially propagates along the left branch.This method actively regulates the guided wave propagation trajectory at the structural level,thereby preventing signal overlap at the T-shaped pipe and offering a novel technical solution for the efficient damage detection and predictive maintenance in ship pipe systems. 展开更多
关键词 Acoustic metamaterials bandgap regulation ultrasonic guided waves frequency-selective transmission T-shaped pipe particle swarm optimization
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Computational Analysis of Thermal Buckling in Doubly-Curved Shells Reinforced with Origami-Inspired Auxetic Graphene Metamaterials 认领 引用 被引量：1
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作者 Ehsan Arshid 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第1期286-318,共33页
In this work,a computational modelling and analysis framework is developed to investigate the thermal buckling behavior of doubly-curved composite shells reinforced with graphene-origami(G-Ori)auxetic metamaterials.A ... In this work,a computational modelling and analysis framework is developed to investigate the thermal buckling behavior of doubly-curved composite shells reinforced with graphene-origami(G-Ori)auxetic metamaterials.A semi-analytical formulation based on the First-Order Shear Deformation Theory(FSDT)and the principle of virtual displacements is established,and closed-form solutions are derived via Navier’s method for simply supported boundary conditions.The G-Ori metamaterial reinforcements are treated as programmable constructs whose effective thermo-mechanical properties are obtained via micromechanical homogenization and incorporated into the shell model.A comprehensive parametric study examines the influence of folding geometry,dispersion arrangement,reinforcement weight fraction,curvature parameters,and elastic foundation support on the critical buckling temperature(CBT).The results reveal that,under optimal folding geometry and reinforcement alignment with principal stress trajectories,the CBT can increase by more than 150%.Furthermore,the combined effect of G-Ori reinforcement and elastic foundation substantially enhances thermal buckling resistance.These findings establish design guidelines for architected composite shells in applications such as aerospace thermal skins,morphing structures,and thermally-responsive systems,and illustrate the potential of auxetic graphene metamaterials for multifunctional,lightweight,and thermally robust structural components. 展开更多
关键词 Thermal buckling analysis semi-analytical modelling graphene-origami auxetic metamaterials doubly-curved shells elastic foundation
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AI-Driven Acoustic Metamaterials for Pixel-Accurate Sound Insulation Control 认领 引用
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作者 Kaijing Liu Yihuan Zhu +3 位作者 Jiachen Meng Ruizhi Dong Xu Wang Yong Li 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第2期349-355,共7页
Acoustic metamaterials have emerged as a promising platform for efficient and flexible low-frequency sound insulation,overcoming the limitations imposed by the mass law governing conventional materials.While metamater... Acoustic metamaterials have emerged as a promising platform for efficient and flexible low-frequency sound insulation,overcoming the limitations imposed by the mass law governing conventional materials.While metamaterials achieve low-frequency sound insulation via local anti-resonances from membranes or plates of their meta-units,their broadband performance is inherently constrained by the narrow-band nature of resonances.Although tailoring the distribution of attached masses offers a pathway to modulate these modes'spectral features,the complexity of such configurations renders analytical solutions intractable.Here,we propose a deep learning framework that bridges this gap by encoding intricate mass distributions as pixelated images(mass-loaded and mass-free regions)and establishing a direct mapping between these images and the resulting transmission loss(TL)spectra.This approach facilitates inverse design of broadband sound-insulating metamaterials for a target TL spectrum and enables rapid performance prediction for arbitrary mass configurations.By synergizing artificial intelligence with the complicated mode engineering of acoustic metamaterials,our work establishes a data-driven paradigm for advanced wave manipulation,opening avenues for next-generation noise control technologies. 展开更多
关键词 pixel accurate control modulate thes transmission loss tailoring distribution attached masses inverse design broadband performance acoustic metamaterials broadband sound insulation
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Bambusa ventricosa-inspired strut topology for mechanical-transport-thermal performance in laser powder bed fused microlattice metamaterials 认领 引用
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作者 Xuerui Xia Jiayi Chen +11 位作者 Lei Zhang Shiyu Zhong Jun Song Congrui Yang Jianbao Gao Gan Li Shuo Wang Zhi Zhang Lei Yang Fanrong Ai Bo Song Yusheng Shi 《Metals Advances》 SCIE EI CAS CSCD 2026年第7期25-41,共17页
The advancement of functional devices operating in multi-physical environments necessitates metamaterials with multi-functional co-modulation capabilities.Inspired by the nodal swelling and internodal tapering of Bamb... The advancement of functional devices operating in multi-physical environments necessitates metamaterials with multi-functional co-modulation capabilities.Inspired by the nodal swelling and internodal tapering of Bambusa ventricosa,we developed diamond-type microlattice metamaterials(MMs)with biconical strut configurations and fabricated them via laser powder bed fusion.Integrating experimental characterization and numerical simulation,we systematically investigated the mechanical,fluidic,and thermal responses of these architected materials.Three functionally graded configurations,designated linear microlattice metamaterials(L-MM),quadratic microlattice metamaterials(Q-MM)and cubic microlattice metamaterials(C-MM),exhibited distinct scaling behaviors:L-MM followed linear Gibson-Ashby-type scaling with relative density,whereas Q-MM and C-MM showed nonlinear,weakly correlated mechanical responses.This divergence from conventional scaling attenuates the interdependence among strength,density,and transport properties,enabling independent optimization of mechanical and functional performance.These findings provide a design rationale for multifunctional metamaterials,with potential applications in aerospace thermal management and biomedical devices. 展开更多
关键词 Additive manufacturing Bio-inspired metamaterials Lattice structures Mechanical properties Multi-physical responses
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4D printing of shape memory alloy metamaterials:Mechanisms,structures,and applications 认领 引用
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作者 Shiqing Wang Hao Cheng +2 位作者 Xiangru Li Bo Song Yusheng Shi 《Metals Advances》 SCIE EI CAS CSCD 2026年第2期8-25,共18页
Additive manufacturing(AM),also referred to as 3D printing,is an emerging fabrication technology that enables the construction of complex multiscale architectures with high material utilization through a layer-by-laye... Additive manufacturing(AM),also referred to as 3D printing,is an emerging fabrication technology that enables the construction of complex multiscale architectures with high material utilization through a layer-by-layer deposition strategy.Based on 3D printing,4D printing introduces a stimulus-responsive functionality in the time dimension,thereby achieving the integrated design of material,structure,and intelligent functional response.With reversible deformation,reusable functionality,and a high degree of topological freedom,4D printing exhibits promising advantages for lightweight and adaptive applications,and has consequently attracted extensive research interest.Following a technology-material-structure-application framework,the paper first reviews additive manufacturing methods for shape memory alloys(SMAs),together with their transformation behavior and principal alloy systems.The concept of metamaterials is then introduced,highlighting representative lattice structures and design strategies.Subsequently,emerging applications of SMA metamaterials are discussed.Finally,current challenges in 4D-printed SMA metamaterials are outlined,and perspectives on future development are proposed,intended to provide a reference for ongoing and forthcoming research. 展开更多
关键词 Additive manufacturing 4D printing Shape memory alloys Transformation behavior Metamaterials
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Bioinspired 3D-Printed NiTi Metamaterials With Bivalve-Like Crossed-Lamellar Structures 认领 引用
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作者 Yu Chen Zengqian Liu +7 位作者 Weibiao Wu Haoliang Wang Shaogang Wang Hanzhong Liu Xuegang Wang Dechun Ren Haibin Ji Zhefeng Zhang 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期810-821,共12页
Metamaterials demonstrate unique mechanical properties and functional performance owing to their distinctive topological spatial structures.In this study,by mimicking the natural Saxidomus purpuratus shell,bioinspired... Metamaterials demonstrate unique mechanical properties and functional performance owing to their distinctive topological spatial structures.In this study,by mimicking the natural Saxidomus purpuratus shell,bioinspired crossed-lamellar architectures with interlamellar apex angles ranging from 60°to 150°were designed and fabricated in NiTi metamaterials by laser beam powder bed fusion(PBF-LB).The microstructural characteristics,monotonic,and cyclic compressive properties,as well as deformation and damage behaviors of the metamaterials were systematically characterized.The metamaterials were revealed to display pronounced mechanical anisotropy,and demonstrate obvious viscoelastic hysteresis under cyclic compression.The mechanical properties are strongly dependent on both the loading direction and the apex angle,with diverse deformation and damage modes that are closely linked to the structural stability.Moreover,the bioinspired metamaterials demonstrate outstanding elastic recovery capability,achieving recovery ratios exceeding 80%upon compression to 10%strain along selected orientations,which surpasses those for other porous NiTi alloys with varying porosities reported in the literature.This is attributed to the intrinsic superelasticity of NiTi in synergy with the good elasticity and mechanical stability conferred by the crossed-lamellar structure.This study provides valuable insights into the structural design,performance optimization,and potential applications of 3D-printed metamaterials. 展开更多
关键词 bioinspired design crossed‑lamellar structure elastic recovery capability mechanical anisotropy metamaterials
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Experimental and Numerical Analysis on Mechanical Behaviors of Negative Poisson’s Ratio Metamaterials 认领 引用
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作者 Zeyu Han Chengbei He Liang Wang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第2期234-252,共19页
Negative Poisson’s ratio materials and structures exhibit lateral expansion under tensile loading,demonstrating significant mechanical advantages over conventional materials.This study systematically investigated thr... Negative Poisson’s ratio materials and structures exhibit lateral expansion under tensile loading,demonstrating significant mechanical advantages over conventional materials.This study systematically investigated three typical two-dimensional negative Poisson’s ratio metamaterial structures(Concave honeycomb,Anti-chiral,and Anti-chiral concave honeycomb hybrid structures)through both experimental tests and numerical analysis.The test specimens were fabricated using selective laser melting(SLM)additive manufacturing technology,and the experimental test was conducted with the use of a DIC strain measurement system.The numerical studies were performed considering both static tensile loading and dynamic impact loading with different strain rates.The deformation behaviors,failure process,negative Poisson’s ratio effects,and energy absorption capacity of the three different metamaterial structures are systematically investigated,and the associated mechanical mechanisms are thoroughly revealed.Results and findings of this work could provide valuable guidance for the engineering design and application of negative Poisson’s ratio metamaterials and structures. 展开更多
关键词 Negative Poisson’s ratio metamaterials energy absorption failure mechanisms
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Buckling-induced metamaterials with one-way zero Poisson’s ratio 认领 引用 被引量：1
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作者 Aijie Tang Qingsheng Yang Junjie Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期255-266,共12页
Researchers have achieved remarkable control over material properties by designing novel architectures,particularly for tuning Poisson’s ratio.Despite abundant existing approaches,significant design space remains une... Researchers have achieved remarkable control over material properties by designing novel architectures,particularly for tuning Poisson’s ratio.Despite abundant existing approaches,significant design space remains unexplored.This work presents two metamaterial designs exhibiting directionally dependent zero Poisson’s ratio,i.e.,one-way zero Poisson’s ratio.In other loading directions,these metamaterials display positive or negative Poisson’s ratio.This selectivity stems from a mode switching mechanism between“unbuckling”and“buckling”of well-designed members within the metamaterials.Theoretical analysis reveals the conditions governing this mode switch,numerical simulation and experiments confirm the one-way Poisson’s effect.Furthermore,the high stiffness contrast within these buckling-prone members yields a pronounced asymmetry in equivalent moduli of the metamaterials under tension and compression,breaking the inherent symmetry of the elastic matrix of conventional materials.This asymmetry is then exploited to design metamaterial beams with asymmetric bending stiffness.Our findings and the design strategy presented here pave the way for developing advanced metamaterials with previously unattainable and unexpected Poisson’s ratios. 展开更多
关键词 Zero Poisson’s ratio Stiffness asymmetry Mechanical metamaterial Buckling-induced
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Reprogramming rate-dependent stress-strain curves of mechanical metamaterials by“stair-building”strategy 认领 引用
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作者 Xin Lin Fei Pan +5 位作者 Jintao Du Ke Ma Juan Guan Xiangchao Feng Pengfei Wang Yuli Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期251-259,共9页
Metamaterials programmed with target rate-dependent mechanical properties are efficient platforms for realizing advanced functionalities.Yet,the loading rate-dependent mechanical property programming has received limi... Metamaterials programmed with target rate-dependent mechanical properties are efficient platforms for realizing advanced functionalities.Yet,the loading rate-dependent mechanical property programming has received limited attention.Here,the“stair-building”strategy is employed in the rate domain by combining the bistability with viscoelasticity.An arbitrary target curve in the programmable space can be approximated by a“stair”built by two kinds of“bricks”.The“bricks”can be realized by a dual-bistable unit,constructed by two bistable structures in series.The dual-bistable unit can switch between two efficient stable phases without inducing changes in the global morphology.Such a unit exhibits N-shaped stress-strain curves at both efficient stable phases with different peak values,resulting in different heights of“bricks”.Moreover,the N-shaped curves have rate-dependent peak values,indicating that the heights of“bricks”change with loading rate.The“stair-building”strategy is realized by array-structured mechanical metamaterials based on dual-bistable units.Different stress-strain curves under various loading rates can be reprogrammed in the same piece of metamaterial by intentionally selecting the efficient stable phases of units.Besides,the rate effect of the metamaterial can also be tuned by reprogramming stress-strain curves under both low and high loading rates,respectively.This reprogrammable metamaterial is promising in smart vibration isolators and adaptive energy absorbers. 展开更多
关键词 Mechanical metamaterial Programmability Rate-dependent effect
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Fractal-Based Acoustic Metamaterials Coupling with Micro-Perforation for Low-Frequency Sound Absorption 认领 引用
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作者 Dongxing Cao Liming Wang +3 位作者 Junru Wang Jianfei Wang Xiangying Guo Shuai Huang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第2期201-217,共17页
Acoustic metamaterials(AMs)exhibit outstanding sound absorption performance due to their customizable design.In this work,a low-frequency sound-absorbing metamaterial plate,which combines a fractal-based labyrinth aco... Acoustic metamaterials(AMs)exhibit outstanding sound absorption performance due to their customizable design.In this work,a low-frequency sound-absorbing metamaterial plate,which combines a fractal-based labyrinth acoustic metamaterial(FLAM)and a micro-perforation panel,is proposed.The theoretical,simulation,and experimental methods are used to comprehensively examine the sound absorption performance.A triangular fractal curve is first introduced,and the combined FLAM model is constructed.An equivalent straight channel model is developed to study the effects of the structural parameters on the sound absorption coefficients.The finite element analysis(FEA)is further conducted to validate the theoretical results.All the findings indicate that the proposed combined FLAM exhibits excellent sound absorption performance at a deep sub-wavelength scale,with absorption coefficients of 0.89,0.98,and 1.00 for the first three fractal orders,respectively.Finally,the prototypes are fabricated,and the impedance tube experiments are conducted,yielding results that align closely with both analytical and FEA results.Notably,the sound absorption performance of large-area sound-absorbing plates is also investigated by splicing two/four FLAMs together,demonstrating a relative absorption bandwidth exceeding 35%.This work offers a viable alternative to low-frequency sound-absorbing materials for potential engineering applications. 展开更多
关键词 Fractal-based acoustic metamaterial(AM) Low-frequency sound absorption Deep sub-wavelength Impedance tube experiment
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Slow light and absorption switchable terahertz metamaterials based on vanadium dioxide phase transformation properties 认领 引用
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作者 Hui HU Chengju MA +3 位作者 Jirui WU Tingyu LI Xin GONG Yueshen WANG 《Optoelectronics Letters》 EI 2026年第6期344-349,共6页
Versatile switchable terahertz devices have important applications in the field of terahertz technology,but it is currently difficult to implement them in a single device.In order to realize the switching between slow... Versatile switchable terahertz devices have important applications in the field of terahertz technology,but it is currently difficult to implement them in a single device.In order to realize the switching between slow light and absorbing functions,a slow light and absorption switchable terahertz metamaterial based on the phase transition characteristics of vanadium dioxide(VO2)is designed,which is composed of a top layer of aluminum(Al)square ring and a ring resonant unit,a middle layer of SiO2 and a bottom layer of VO2.Based on the electromagnetic field theory,the finite time domain difference(FDTD)method is used to simulate and analyze the optical properties of VO2 in two states.When VO2 is in the insulating state,the metamaterial can achieve a slow light effect with a maximum group delay of 2.85 ps,and when VO2 is in the metallic state,the absorption rate of the metamaterial can reach 88.5%at 0.287 THz and 99.95%at 0.597 THz.We simulate the temperature-controlled phase transition process of VO2 by changing the conductivity of VO2,which can achieve the switching of slow light and absorption functions.In addition,we also found that the material is polarization insensitive.The metamaterial we have designed has some value in the research of terahertz multifunctional devices. 展开更多
关键词 phase transition characteristics terahertz metamaterial terahertz devices Vanadium dioxide ring resonant unita Phase transition Absorption switchable switching slow light absorbing functionsa
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Nanorod metamaterials for high-resolution responsive color definition 认领 引用
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作者 An Ping Haibin Ni +5 位作者 Toluwalase A.Isogun Alexey V.Krasavin Ying Shi Bo Ni Jianhua Chang Anatoly V.Zayats 《Advanced Photonics Nexus》 CSCD 2026年第5期132-142,共11页
Nanostructured materials have attracted considerable attention as a versatile platform for achieving robust artificial color patterning with ultrahigh resolution as opposed to conventional pigments and dyes.We present... Nanostructured materials have attracted considerable attention as a versatile platform for achieving robust artificial color patterning with ultrahigh resolution as opposed to conventional pigments and dyes.We present a strategy for creating efficient structural colors by employing vertically aligned gold-core/silver-shell nanorod metamaterials.The developed approach enables broad structural-color tuning and maintains stable reflected colors over a wide range of incident angles.The metamaterials are fabricated by a template-assisted electrodeposition method using self-organized anodic aluminum oxide nanopores,which is compatible with large-area production.We further demonstrate applications in refractive index and humidity sensing,which are important for anti-counterfeiting,environmental monitoring,and other responsive color applications. 展开更多
关键词 structural color responsive sensing nanorod metamaterials
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Multifunctional and reprogrammable 4D pixel mechanical metamaterials 认领 引用 被引量：3
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作者 Xiaozhou Xin Cheng Lin +5 位作者 Bingxun Li Ruikang Zhang Chengjun Zeng Liwu Liu Yanju Liu Jinsong Leng 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2025年第1期595-608,共14页
Metamaterials have exotic physical properties that rely on the construction of their underlying architecture.However,the physical properties of conventional mechanical metamaterials are permanently programmed into the... Metamaterials have exotic physical properties that rely on the construction of their underlying architecture.However,the physical properties of conventional mechanical metamaterials are permanently programmed into their periodic interconnect configurations,resulting in their lack of modularity,scalable fabrication,and programmability.Mechanical metamaterials typically exhibit a single extraordinary mechanical property or multiple extraordinary properties coupled together,making it difficult to realize multiple independent extraordinary mechanical properties.Here,the pixel mechanics metamaterials(PMMs)with multifunctional and reprogrammable properties are developed by arraying uncoupled constrained individual modular mechanics pixels(MPs).The MPs enable controlled conversion between two extraordinary mechanical properties(multistability and compression-torsion coupling deformation).Each MP exhibits 32 independent and reversible room temperature programming configurations.In addition,the programmability of metamaterials is further enhanced by shape memory polymer(SMP)and 4D printing,greatly enriching the design freedom.For the PMM consisting of m×n MPs,it has 32(m×n)independent room temperature programming configurations.The application prospects of metamaterials in the vibration isolation device and energy absorption device with programmable performance have been demonstrated.The vibration isolation frequencies of the MP before and after programming were[0 Hz-5.86 Hz],[0 Hz-13.67 Hz and 306.64 Hz-365.23 Hz].The total energy absorption of the developed PMM can be adjusted controllably in the range of 1.01 J-3.91 J.Six standard digital logic gates that do not require sustained external force are designed by controlling the closure between the modules.This design paradigm will facilitate the further development of multifunctional and reprogrammable metamaterials. 展开更多
关键词 4D printing shape memory polymer pixel mechanical metamaterials multistable compression-twist coupling metamaterials digital logic gates
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Lightweight integrated sound absorbing-insulating metamaterials with low thickness 认领 引用
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作者 Weidi XIA Hongxing LI +3 位作者 Guotao ZHA Fulin GUO Chongrui LIU Fuyin MA 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第2期215-234,共20页
This paper proposes two types of integrated sound absorbing-insulating metamaterials with low thickness and efficient sound attenuation in the low-frequency bandwidth,i.e.,labyrinth-type metamaterial and multi-order r... This paper proposes two types of integrated sound absorbing-insulating metamaterials with low thickness and efficient sound attenuation in the low-frequency bandwidth,i.e.,labyrinth-type metamaterial and multi-order resonator metamaterial.The labyrinth-type metamaterial is designed through spatial dimension transfer,transferring the required dimension in the thickness direction to the planar thin layer.Based on the Helmholtz resonance,the metamaterial achieves noise reduction through the reflection of sound waves and the thermoviscous dissipation of holes and cavities.This mechanism enables its sound insulation performance to produce the same gain effect as absorption,thereby accomplishing the broadband absorbing-insulating integrated design.With a thickness of only 33 mm,it achieves both sound absorption and insulation effects over more than one octave.The multi-order resonator metamaterial has a larger working bandwidth than the labyrinth-type metamaterial.It is designed based on the multiorder resonance absorption mechanism,and consists of 9 different orders of resonator units.The metamaterial obtains a continuous sound absorption coefficient curve in the low-frequency range of 362–1712 Hz,and possesses high transmission loss(TL)above 346 Hz.In addition,this paper deeply explores the sound absorbing-insulating mechanism through the correlation analysis between the sound absorption coefficient and TL curves.The experimental results verify the continuous and efficient absorption effects of the two metamaterials,as well as their insulation performance that breaks the mass law.In low-frequency engineering applications,the two designed metamaterials demonstrate great potential and value at sub-wavelength dimensions. 展开更多
关键词 acoustic metamaterial low-frequency bandwidth noise reduction integrated sound absorbing-insulating Helmholtz resonance thermoviscous dissipation spatial folding
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Temperature-Dependent Infrared Engineering for Extreme Environments:All-Dielectric Thermal Photonic Metamaterials Stable at 1873 K in Air 认领 引用
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作者 Yang Liu He Lin +5 位作者 Yunxia Zhou Liming Yuan Yanqin Wang Xiaoliang Ma Cheng Huang Xiangang Luo 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第6期879-897,共19页
The development of infrared engineering technologies for extreme environments remains a formidable challenge due to the inherent trade-offs among optical performance,thermal stability,and mechanical integrity in therm... The development of infrared engineering technologies for extreme environments remains a formidable challenge due to the inherent trade-offs among optical performance,thermal stability,and mechanical integrity in thermal photonic metamaterials(TPMs).This work introduces a novel multi-obj ective design framework and demonstrates the design,fabrication,and validation of a TPM operating under extreme temperatures up to 1873 K.We have established a holistic design framework integrating temperaturedependent neural network and Pareto multi-obj ective optimization to co-optimize spectral response,component light-weighting,and structural efficiency.The framework achieves 100 times faster computation than genetic algorithms.The performance of the designed TPM was evaluated under various atmospheric models and detection distances.The TPM achieved a peak radiance suppression efficiency of 82%and a maximum attenuation of-7.4 dB at 1200-1500 K.Experimentally,we fabricated an all-dielectric TPM using a refractory TiO2/BeO multilayer stack with only 5 layers and 2um total thickness.The optimized structure shows high reflectivity(0.62 at 3-5 um;0.48 at 8-14μm)for radiative suppression and high emissivity(0.87 at 5-8μm)for radiative cooling.The TPM withstands 1873 K for 12 h in air with less than 3%spectral drift,retaining excellent mechanical properties.On high-temperature components,it achieves 40-50%radiative suppression and 40-60 K(~10.1 kW m-2)radiative cooling at 1100 K,endures over 20 times thermal shock cycles(>150 K s-1,700-1500 K),and maintains stable performance over 5 cycles,with 78%visible and 98%microwave transmittance.This work establishes a new paradigm in the design and application of photonic materials for extreme environments. 展开更多
关键词 Extreme environment Thermal photonic Metamaterial Machine learning Thermal management
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