Viscoelastic effects on the frequency response of elastomeric metastructures

Pierce, Connor; Chen, Vincent; Hardin, James O.; Willey, Carson L.; Berrigan, John D.; Juhl, Abigail T.; Matlack, Kathryn H.

doi:10.1117/12.2513912

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…A typical structural lattice is constructed from periodically connected primary elastic elements, such as beams [2][3][4] or plates [5]. In addition to their relatively lightweight and unique mechanical properties, lattice structures allow for manipulation of elastic waves by tailoring the geometrical design of unit cells [2,6], which can be further complemented by smart functionalities using selfhealing and shape-memory materials [7] or magnetoactive elastomers [8]. Periodical construction of such lattices has enabled a plethora of unconventional wave phenomena, including frequency bandgaps [2][3][4]6], unique dissipative properties [9], cloaking [10] and localization of vibrational energy [11], all of which surpass what is naturally possible in conventional materials.…”

Section: Introduction (A) Wave Propagation In Lattice Structuresmentioning

confidence: 99%

Enabling novel dispersion and topological characteristics in mechanical lattices via stable negative inertial coupling

2021

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Mechanical topological insulators have enabled a myriad of unprecedented characteristics that are otherwise not conceivable in traditional periodic structures. While rich in dynamics, new developments in the domain of mechanical topological systems are hindered by their inherent inability to exhibit negative elastic or inertial couplings owing to the inevitable loss of dynamical stability. The aim of this paper is, therefore, to remedy this challenge by introducing a class of architected inertial metamaterials (AIMs) as a platform for designing mechanical lattices with novel topological and dispersion traits. We show that carefully coupling elastically supported masses via moment-free rigid linkages invokes a dynamically stable negative inertial coupling, which is essential for topological classes in need of such negative interconnection. The potential of the proposed AIMs is demonstrated via three examples: (i) a mechanical analogue of Majorana edge states, (ii) a square diatomic AIM that can sustain the quantum valley Hall effect (classically arising in hexagonal lattices), and (iii) a square tetratomic AIM with topological corner modes. We envision that the presented framework will pave the way for a plethora of robust topological mechanical systems.

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Section: Introduction (A) Wave Propagation In Lattice Structuresmentioning

confidence: 99%

Enabling novel dispersion and topological characteristics in mechanical lattices via stable negative inertial coupling

2021

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“…[5,6] The periodic nature of lattice materials also strongly influences elastic wave propagation and can support band gaps, opening applications such as passive and tailorable vibration isolation designed directly into load-bearing structural components. Other mechanisms such as local resonances, [7][8][9][10] inertial amplification, [11] or grounded resonators [12] enable much lower frequency responses, which can even be coupled with active elements to adapt the response [13][14][15][16] . Lattice materials, even though inherently thermally resistive, can showcase unique thermal management capability if additional heat carrying mechanisms are used between unit cells.…”

Section: Introductionmentioning

confidence: 99%

Independently Tunable Thermal Conductance and Phononic Band Gaps of 3D Lattice Materials

et al. 2019

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Lattice materials provide unusual thermal and vibrational properties but not within the same structure. Thermal and vibrational multifunctionality is, however, crucial for thermomechanical applications such as automotive, aerospace, building, transportation, and energy infrastructure. In applications involving mobility, both high heat transfer and low mass are desired. Although there have been various efforts to design multifunctional lattice materials, the focus has largely remained on quasi‐static mechanical and thermal properties or mechanical and vibrational properties. Herein, designs of realizable lattice materials are reported, which are inherently thermally resistive, with vastly improved thermal conductance and omnidirectional phononic band gaps. By redesigning the truss structures to serve as interconnected heat pipes, a three‐order‐of‐magnitude improvement in the specific thermal conductance is found. Nodal masses at truss junctions are further used to obtain full vibrational band gaps. It is shown that it is possible to independently tune vibrational and thermal properties within the same structure. This work provides background for the design and fabrication of multifunctional lattice materials that simultaneously prevent structural vibrations and enhance heat conduction.

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Viscoelastic effects on the frequency response of elastomeric metastructures

Cited by 2 publications

References 24 publications

Enabling novel dispersion and topological characteristics in mechanical lattices via stable negative inertial coupling

Enabling novel dispersion and topological characteristics in mechanical lattices via stable negative inertial coupling

Independently Tunable Thermal Conductance and Phononic Band Gaps of 3D Lattice Materials

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