Experimental study on uniaxial ratchetting of VHB 4910 dielectric elastomer

Huang, Weiyang; Kang, Guozheng

doi:10.1016/j.polymertesting.2022.107557

Cited by 12 publications

(3 citation statements)

References 23 publications

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“…Based on Supplementary Fig. 27, the hysteresis values of M p , M p-w-p , M w , and M w-p-w sensors were calculated as 18, 27, 28, and 31, respectively, as the hysteresis of a VHB tape increased with the applied strains of 5%, 15%, 25%, and 40% 44,45 . Fabrication reproducibility is highly critical for wearable sensor applications, as the users can avoid re-calibration of as-fabricated M n sensors and use the in-database S ε -ε profiles as the references 23,46,47 .…”

Section: Crack Propagation Behaviors Of M N Sensors With Homogenous A...mentioning

confidence: 99%

Topographic design in wearable MXene sensors with in-sensor machine learning for full-body avatar reconstruction

Yang

Xiao

et al. 2022

Nat Commun

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Wearable strain sensors that detect joint/muscle strain changes become prevalent at human–machine interfaces for full-body motion monitoring. However, most wearable devices cannot offer customizable opportunities to match the sensor characteristics with specific deformation ranges of joints/muscles, resulting in suboptimal performance. Adequate wearable strain sensor design is highly required to achieve user-designated working windows without sacrificing high sensitivity, accompanied with real-time data processing. Herein, wearable Ti3C2Tx MXene sensor modules are fabricated with in-sensor machine learning (ML) models, either functioning via wireless streaming or edge computing, for full-body motion classifications and avatar reconstruction. Through topographic design on piezoresistive nanolayers, the wearable strain sensor modules exhibited ultrahigh sensitivities within the working windows that meet all joint deformation ranges. By integrating the wearable sensors with a ML chip, an edge sensor module is fabricated, enabling in-sensor reconstruction of high-precision avatar animations that mimic continuous full-body motions with an average avatar determination error of 3.5 cm, without additional computing devices.

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Section: Crack Propagation Behaviors Of M N Sensors With Homogenous A...mentioning

confidence: 99%

Topographic design in wearable MXene sensors with in-sensor machine learning for full-body avatar reconstruction

Yang

Xiao

et al. 2022

Nat Commun

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show abstract

“…However, traditional approach of determining the dielectric constant upon stretching is ex situ and clumsy. In these approaches, the samples with predetermined area were stretched by clamping them in a frame, following which the electrodes were prepared and the capacitance was measured to determine the dielectric constant [21][22][23]. Based on the above methods, the sample thickness measurement is not accurate, and the tensile strain is difficult to measure accurately [18].…”

Section: Introductionmentioning

confidence: 99%

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Wang,

Yang,

Xie

et al. 2024

Preprint

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Dielectric elastomers, such as thermoplastic polyurethanes (TPU), are widely used as dielectric layer, emulation layer and substrate of flexible and stretchable devices. To construct capacitors and actuators that work stably upon deformation, it has become an urgent need to investigate the evolution of dielectricity under stress and strain. However, the lack of effective methods for estimating the dielectric constant of elastomers under strain poses a big challenge. This article reports a device for in-situ measuring the dielectric constant of TPU under strain. It is found that upon stretching TPU to a strain of 400%, its dielectric constant decreases from 8.47 to 2.94. In addition, combined Fourier-transform infrared spectroscopy, X-ray scattering technique, and atomic force microscopy have been utilized to characterize the evolution of microstructure under strain. The investigation under tensile strain reveals that a decreased density and average size of polarized hard domains, along with a tendency of the molecular chains to align in parallel with the tensile stress. The evolution of the microstructures results in a reduction of the dielectric constant parallel to the electric field in TPU. Our work provides valuable experimental reference for improving the stability of flexible sensors and actuators based on dielectric elastomers.

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“…However, the traditional approach for determining the dielectric constant upon stretching is ex situ and clumsy. In these approaches, samples with a predetermined area were stretched by clamping them in a frame, following which the electrodes were prepared and the capacitance was measured to determine the dielectric constant [ 21 , 22 , 23 ]. Based on the above methods, the sample thickness measurement is not accurate, and the tensile strain is difficult to measure accurately [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Wang,

Yang,

Xie

et al. 2024

Polymers

View full text Add to dashboard Cite

Dielectric elastomers, such as thermoplastic polyurethanes (TPUs), are widely used as the dielectric layer, encapsulation layer, and substrate of flexible and stretchable devices. To construct capacitors and actuators that work stably upon deformation, it has become urgent to investigate the evolution of dielectricity under stress and strain. However, the lack of effective methods for estimating the dielectric constant of elastomers under strain poses a big challenge. This study reports a device for the in situ measurement of the dielectric constant of TPU under strain. It is found that upon stretching TPU to a strain of 400%, its dielectric constant decreases from 8.02 ± 0.01 to 2.88 ± 0.25 (at 1 MHz). In addition, combined Fourier-transform infrared spectroscopy, the X-ray scattering technique, and atomic force microscopy were utilized to characterize the evolution of the microstructure under strain. The investigation under tensile strain reveals a decreased density and average size of polarized hard domains, along with a tendency of the molecular chains to align in parallel with the tensile stress. The evolution of the microstructures results in a reduction in the measured dielectric constant in TPU.

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Experimental study on uniaxial ratchetting of VHB 4910 dielectric elastomer

Cited by 12 publications

References 23 publications

Topographic design in wearable MXene sensors with in-sensor machine learning for full-body avatar reconstruction

Topographic design in wearable MXene sensors with in-sensor machine learning for full-body avatar reconstruction

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

Strain Effect on Dielectricity of Elastic Thermoplastic Polyurethanes

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