Static and dynamic stability of dielectric elastomer fiber composites

Sharma, Atul Kumar; Sheshkar, Nikhil; Gupta, Ankur

doi:10.1016/j.matpr.2020.12.151

Cited by 15 publications

(2 citation statements)

References 14 publications

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“…Soft elastomeric silicone such as Poly-dimethyl siloxane (PDMS), has shown advantages in variety of applications, including structural engineering, wearable and flexible electronics, biomedical and tissue engineering, and many more, due to resistance to climate changes, bio-compatibility, liquidity nature, and dielectric properties [14], [15]. As a result of its low modulus of elasticity and high stretchability, PDMS can be an excellent substrate material used in the fabrication of flexible devices [16], [17]. Pure PDMS has poor mechanical properties and low tear resistance, therefore severely limiting its practical application.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal and mechanical properties of hydrophobic graphite-embedded polydimethylsiloxane composite

et al. 2021

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This work reports the facile fabrication of graphite embedded polydimethylsiloxane (PDMS) composites using in-situ polymerization and investigates the impact of graphite fillers on their mechanical and thermal characteristics. The extensive characterization is performed using scanning electron microscopy (SEM), contact angle measurement system, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The mechanical properties of the prepared composites are investigated by compression test which explores the possibility of manipulating the PDMS properties by unswervingly modifying the concentration of conductive graphite filler which improves filler dispersion in the PDMS and increases its interaction with graphite fillers, thereby enhancing the mechanical and thermal characteristics of the manufactured composites. The current study confirms the hydrophobicity (contact angle ~112°) of the fabricated composites and investigates the impact of graphite concentrations ranging from 2.5%-20% on the mechanical properties of pure PDMS polymer during compression testing. Furthermore, the thermal conductivity, thermal diffusivity, and specific heat of graphite-embedded PDMS were around 82%, 505% and 1040% higher than that of the pure PDMS, respectively, while the mechanical properties for the compressive module ranged from 3.2 MPa to 4.9 MPa with the elastic behavior up to 40% strain.

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Section: Introductionmentioning

confidence: 99%

Enhanced thermal and mechanical properties of hydrophobic graphite-embedded polydimethylsiloxane composite

et al. 2021

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“…As mentioned, using the above theory, Shmuel (2013) determined the quasistatic deformation of the periodic DE composite owing to axial electric fields [see also the study by Sharma et al (2021)],…”

Section: Quasistatic Finite Deformation and Incremental Anti-plane Shear Waves In De Compositesmentioning

confidence: 99%

Gradient-based topology optimization of soft dielectrics as tunable phononic crystals

Sharma

Kosta

Gal

et al. 2022

Composite Structures

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Dielectric elastomers are active materials that undergo large deformations and change their instantaneous moduli when they are actuated by electric fields. By virtue of these features, composites made of soft dielectrics can filter waves across frequency bands that are electrostatically tunable.To date, to improve the performance of these adaptive phononic crystals, such as the width of these bands at the actuated state, metaheuristics-based topology optimization was used. However, the design freedom offered by this approach is limited because the number of function evaluations increases exponentially with the number of design variables. Here, we go beyond the limitations of this approach, by developing an efficient gradient-based topology optimization method for maximizing the width of the band gaps in an exemplary case study. We employ a finite element formulation of the governing equations, and use the properties of each element as the design variables. In order to iteratively update the design variables, we employ gradient-based optimization, namely the Method of Moving Asymptotes. We carry out and implement fully analytical sensitivity analysis for computing the gradient of the objective function with respect to each one of the design variables. The numerical results of the method developed here demonstrate prohibited frequency bands that are indeed wider that those that were generated using metaheuristics-based topology optimization, while the computational cost to identify them is reduced by orders of magnitude.

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Constructing inkjet printed dielectric elastomers with modified silicon carbide nanowire surfaces to enhance electromechanical performance

Wang,

Zhao,

Zhang

et al. 2024

Polymer Composites

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Dielectric elastomers (DEs), have attracted interest because they can replicate the behavior of muscles. They can change shape when subjected to an electric field. A novel DE is proposed in this study that incorporates silicon carbide (SiC) nanowires into silicone rubber (SR). The nanowires were propagated using polycarbosilane via a chemical vapor reaction (CVR). A boronate polymer was employed to promote compatibility between SR and SiC nanowires which modified the nanowire surfaces, leveraging a strong adhesive quality of the catechol moiety. Electrohydrodynamic (EHD) inkjet printing was then used to form the DEs into various shapes. These DEs had substantial dielectric constants of the order of 4.46. Significantly, one of the DEs achieved the highest actuated area strain of 20.36% in an electric field of 16.5 V/μm, demonstrating excellent driving performance. Furthermore, when used the fabricated DEs showed pronounced long‐term stability, meaning they are capable of finding applications in artificial intelligence, biomimetics, aerospace, and other disciplines.Highlights The SiC nanowires were obtained through a chemical vapor reaction. A boronate polymer with catechol moiety was used to modify the SiC nanowires. DEs were formed various shapes by inkjet printing. DEs achieved very large actuated strains of up to 20.36% at 16.5 V/μm.

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Static and dynamic stability of dielectric elastomer fiber composites

Cited by 15 publications

References 14 publications

Enhanced thermal and mechanical properties of hydrophobic graphite-embedded polydimethylsiloxane composite

Enhanced thermal and mechanical properties of hydrophobic graphite-embedded polydimethylsiloxane composite

Gradient-based topology optimization of soft dielectrics as tunable phononic crystals

Constructing inkjet printed dielectric elastomers with modified silicon carbide nanowire surfaces to enhance electromechanical performance

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