Surface integrity and size dependent modeling and performance of non-uniform flexoelectric energy harvesters

Rojas, Eyberth; Faroughi, Shirko; Abdelkefi, A.; Park, Y. H.

doi:10.1007/s00542-020-04835-4

Cited by 7 publications

(1 citation statement)

References 74 publications

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“…This raises many questions about the reliability of this approach to model the behaviors of these resonators accurately at smaller scales. Indeed, designing mechanical systems at the nano-scale results in the presence of significant effects due to the size dependency and material structure [35], in addition to other effects including surface elasticity (Larkin et al 2020), surface roughness (Nikpourian et al 2019;Rojas et al 2020), and van der Waals forces (Esfahani et al 2019a;Nikpourian et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear size-dependent modeling and dynamics of nanocrystalline arc resonators

Hajjaj

Ortiz

Abdelkefi

2021

Int J Mech Mater Des

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The adequate modeling of the micro/nano arc resonators' dynamics is vital for their successful implementation. Here, a size-dependent model, wherein material structure, porosity, and micro-rotation effects of the grains are considered, is derived by combining the couple stress theory, multi-phase model, and the classical Euler–Bernoulli beam model, aiming to characterize the frequency tunability of micro/nano arc resonators as monitoring either the axial load or the electrostatic force for the first time. The arc dimensions are optimized to show various phenomena in the same arc, namely snap-through, crossing, and veering. The first three natural frequencies are monitored, showing the size dependency on the frequency tuning, snap-through/back, and pull-in instability as shrinking the scale from micro- to nano-scale. Significant changes in the static snap-through and pull-in voltages and the resonance frequencies were shown as scale shrinks. A dynamic analysis of the resonator's vibration shows a dramatic effect of the size-dependency as shrinking dimensions around the veering zone.

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