Study on the Electret Film Crumpling Deformation Theory and Flexoelectric-Like Responses

LIU Yaohua; LI Jun; FENG Xiaoman; MA Jianhua; WANG Binglei

doi:10.21656/1000-0887.450195

Volume 45 Issue 11

Nov. 2024

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Article Navigation > Applied Mathematics and Mechanics > 2024 > 45(11): 1392-1404

LIU Yaohua, LI Jun, FENG Xiaoman, MA Jianhua, WANG Binglei. Study on the Electret Film Crumpling Deformation Theory and Flexoelectric-Like Responses[J]. Applied Mathematics and Mechanics, 2024, 45(11): 1392-1404. doi: 10.21656/1000-0887.450195

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Study on the Electret Film Crumpling Deformation Theory and Flexoelectric-Like Responses

doi: 10.21656/1000-0887.450195

Department of Engineering Mechanics, Shandong University, Jinan 250061, P.R.China

Received Date: 2024-07-02
Rev Recd Date: 2024-08-19
Publish Date: 2024-11-01

Abstract

Abstract

The flexoelectric energy harvesters face such challenges as the monotonous energy harvesting mode, the low electromechanical coupling coefficient, the only prominent effect on microscales, and the limited energy conversion efficiency on macroscales. The electret, as a dielectric material with embedded charges, exhibits significant flexoelectric-like responses induced by non-uniform deformation. The crumpled film in complex bidirectional contraction, provides a novel efficient energy harvesting approach due to high strain gradients on macroscales. Herein the strong macroscopic electromechanical coupling properties of electrets were combined with the advantageous high strain gradients of crumpling, to establish a deformation theory for crumpled flexoelectret films. Based on this model, the flexoelectric-like responses and energy harvesting characteristics of crumpled flexoelectret films were analyzed for different charge densities, supporting cup radii, film thicknesses, and scales. The results indicate that, for a 1 mm thick flexoelectret film, the effective flexoelectric-like intensity is 2 orders higher than that of the intrinsic flexoelectric effect of the pure PDMS film, with the charge density q=-0.2 mC · m^-2.
- electret film,
- crumpling deformation,
- flexoelectric-like response,
- energy harvesting

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References(30)

References

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