Design of mechanical metamaterials for simultaneous vibration isolation and energy harvesting

Liu, Ying; Baker, Evan; Reissman, Timothy; Sun, Cheng; Liu, Wing Kam

doi:10.1063/1.5008674

Cited by 126 publications

(60 citation statements)

References 51 publications

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“…The virgin lattice consists of 16 local resonators in which a rectangular island is connected to the structural frame through two thin beams (resonator A; Fig. 5j(i-ii)) 50 . After deactivating one thin beam via fracture and bending, the island and another thin beam constitute another local resonator (resonator B; Fig.…”

Section: Lattice Transformation Via Fracture-memory-healing Cyclesmentioning

confidence: 99%

Healable, memorizable, and transformable lattice structures made of stiff polymers

Xin

et al. 2020

NPG Asia Mater

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Emerging transformable lattice structures provide promising paradigms to reversibly switch lattice configurations, thereby enabling their properties to be tuned on demand. The existing transformation mechanisms are limited to nonfracture deformation, such as origami, instability, shape memory, and liquid crystallinity. In this study, we present a class of transformable lattice structures enabled by fracture and shape-memory-assisted healing. The lattice structures are additively manufactured with a molecularly designed photopolymer capable of both fracture healing and shape memory. We show that 3D-architected lattice structures with various volume fractions can heal fractures and fully restore stiffness and strength over two to ten healing cycles. In addition, coupled with the shape-memory effect, the lattice structures can recover fracture-associated distortion and then heal fracture interfaces, thereby enabling healing of lattice wing damages, mode-I fractures, dent-induced crashes, and foreign-object impacts. Moreover, by harnessing the coupling of fracture and shape-memory-assisted healing, we demonstrate reversible configuration transformations of lattice structures to enable switching among property states of different stiffnesses, vibration transmittances, and acoustic absorptions. These healable, memorizable, and transformable lattice structures may find broad applications in next-generation aircraft panels, automobile frames, body armor, impact mitigators, vibration dampers, and acoustic modulators.

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Section: Lattice Transformation Via Fracture-memory-healing Cyclesmentioning

confidence: 99%

Healable, memorizable, and transformable lattice structures made of stiff polymers

Xin

et al. 2020

NPG Asia Mater

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“…Metamaterials are artificial materials which have extraordinary mechanical or electro-mechanical properties not observed in nature (Li et al, 2017). The presented metamaterial structure includes the periodic pattern cells with negative Poisson ratio (Koudelka et al, 2016) and smart elements are inserted inside individual cells (Hu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Concept of Metamaterial With Piezoelectric Elements for Cyber-Physical System Applications

Hadaš¹,

Marcián²,

Rubes³

et al. 2020

Engineering Mechanics 2020

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This paper deals with a metamaterial for sensing purposes under Industry 4.0 applications. The presented of metamaterial is based on an auxetic structure which is made by Direct Metal Laser Sintering technology. The stain steel auxetic structure could integrate smart material elements or systems for electromechanical conversions. The proposed concept of metamaterial uses the auxetic structure with piezoelectric elements or stacks to transduce external load of structure into electric signal. The auxetic structure could provide uniform mechanical load on several smart piezoelectric elements in middle layers due to negative Poisson ration. The paper presents a FEM simulation of this concept and analysis of coupled electromechanical system under harmonic excitation. Deformation of auxetic structure with piezoceramic PZT plates is presented and the voltage response is analyzed. The assembly of metamaterial system with piezoelectric PVDF in case of soft application is also presented and it will be tested under future development.

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“…Li et al . 10 attached cantilever beams to the structural frame to transfer elastic wave in the frame to the local resonance of attached beams, which consequently generates band gaps. Various lattice topologies of two-dimensional structures were suggested through parametric studies on configuration designs, including self-similar fractal 11 , star 12 , zig-zag 13 , and chiral 14 shaped structures.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of lattice structures for controllable extremal band gaps

Choi

Koo

et al. 2019

Sci Rep

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This paper presents very large complete band gaps at low audible frequency ranges tailored by gradient-based design optimizations of periodic two- and three-dimensional lattices. From the given various lattice topologies, we proceed to create and enlarge band gap properties through controlling neutral axis configuration and cross-section thickness of beam structures, while retaining the periodicity and size of the unit cell. Beam neutral axis configuration and cross-section thickness are parameterized by higher order B-spline basis functions within the isogeometric analysis framework, and controlled by an optimization algorithm using adjoint sensitivity. Our optimal curved designs show much more enhanced wave attenuation properties at audible low frequency region than previously reported straight or simple undulated geometries. Results of harmonic response analyses of beam structures consisting of a number of unit cells demonstrate the validity of the optimal designs. A plane wave propagation in infinite periodic lattice is analyzed within a unit cell using the Bloch periodic boundary condition.

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Design of mechanical metamaterials for simultaneous vibration isolation and energy harvesting

Cited by 126 publications

References 51 publications

Healable, memorizable, and transformable lattice structures made of stiff polymers

Healable, memorizable, and transformable lattice structures made of stiff polymers

Concept of Metamaterial With Piezoelectric Elements for Cyber-Physical System Applications

Optimal design of lattice structures for controllable extremal band gaps

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