Feasibility of a Dielectric Elastomer Augmented Aorta

Almanza, Morgan; Clavica, Francesco; Chavanne, J.; David, Moser; Obrist, Dominik; Carrel, Thierry; Civet, Yoan; Perriard, Yves

doi:10.1002/advs.202001974

Cited by 34 publications

(30 citation statements)

References 56 publications

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“…[ 54 ]). It is to be stressed that the results obtained should potentially be useful in the design of electroelastic sensors and transducers as well as biomedical applications [ 57 , 58 ], prostheses, and robots, for example, in the case of cylindrical geometry for aortic prosthesis [ 59 ]. This is one of the main highlights of the present study, that is, to prevent the appearance of unexpected anomalous electroelastic responses.…”

Section: Discussionmentioning

confidence: 99%

Viscoelastic Effects on the Response of Electroelastic Materials

et al. 2021

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Electroelastic materials, as for example, 3M VHB 4910, are attracting attention as actuators or generators in some developments and applications. This is due to their capacity of being deformed when submitted to an electric field. Some models of their actuation are available, but recently, viscoelastic models have been proposed to give an account of the dissipative behaviour of these materials. Their response to an external mechanical or electrical force field implies a relaxation process towards a new state of thermodynamic equilibrium, which can be described by a relaxation time. However, it is well known that viscoelastic and dielectric materials, as for example, polymers, exhibit a distribution of relaxation times instead of a single relaxation time. In the present approach, a continuous distribution of relaxation times is proposed via the introduction of fractional derivatives of the stress and strain, which gives a better account of the material behaviour. The application of fractional derivatives is described and a comparison with former results is made. Then, a double generalisation is carried out: the first one is referred to the viscoelastic or dielectric models and is addressed to obtain a nonsymmetric spectrum of relaxation times, and the second one is the adoption of the more realistic Mooney–Rivlin equation for the stress–strain relationship of the elastomeric material. A modified Mooney–Rivlin model for the free energy density of a hyperelastic material, VHB 4910 has been used based on experimental results of previous authors. This last proposal ensures the appearance of the bifurcation phenomena which is analysed for equibiaxial dead loads; time-dependent bifurcation phenomena are predicted by the extended Mooney–Rivlin equations.

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Section: Discussionmentioning

confidence: 99%

Viscoelastic Effects on the Response of Electroelastic Materials

et al. 2021

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Section: Application Toward Ihmimentioning

confidence: 99%

“…[276] A dielectric elastomer aorta (DEAA) composed of a multilayer tubular structure was developed to assist the pulsatile behavior of the heart (Figure 13c). [277] Based on in vitro experiments, the success of DEAA was presented with 5.5% reduction to the work done by the heart. Achieved through electrical control of the DEAA stiffness, aorta deformations can be relieved while recoil forces were enhanced during ventricle systole and diastole, respectively.…”

Section: Application Toward Ihmimentioning

confidence: 99%

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Low‐Voltage Soft Actuators for Interactive Human–Machine Interfaces

Chen

Tan

Gong

et al. 2021

Advanced Intelligent Systems

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Soft electrical actuators driven by low voltages are promising for interactive human-machine interfaces (iHMI) applications including executing orders to complete various tasks and communicating with humans. The attractive features of low-voltage soft electrical actuators include their good safety, low power consumption, small system size, and nonrigid or deformable characteristics. This review covers three typical classes of electrical actuators, namely, electrochemical, electrothermal, and other electrical (dielectric, electrostatic, ferroelectric, and plasticized gel) actuators according to their mechanism and working potential range. For each kind of actuators, the advantages, working principle, device configuration/design, materials selection, recent progress, and potential applications for iHMI are summarized, with the strategies for enhancing the actuation performance under low voltages being highlighted. Finally, the challenges for those soft actuators and possible solutions are discussed.

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“…Another important feature that makes DEAs particularly attractive is the self-sensing, i.e., the possibility of estimating the DEA deflection during electrical actuation by measuring the membrane electrical capacitance [7,8]. These unique features, combined with other advantages such as large deformations (above 100%) [1], high energy efficiency [9], low cost, and lightweight, make DE transducers attractive for a wide range of application fields, e.g., valves [10], pumps [11,12], loudspeakers [13,14], Braille displays [15], artificial muscles [16,17], and medical systems [18,19]. More recently, the use of DE technology has also been investigated in less conventional application fields such as wearables [20,21] and soft robotics [22], as well as cooperative micro electro-mechanical systems (MEMS) [23].…”

Section: Introductionmentioning

confidence: 99%

Model-Based Design Optimization of Soft Polymeric Domes Used as Nonlinear Biasing Systems for Dielectric Elastomer Actuators

Croce

Neu

Hubertus³

et al. 2021

Actuators

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Due to their unique combination of features such as large deformation, high compliance, lightweight, energy efficiency, and scalability, dielectric elastomer (DE) transducers appear as highly promising for many application fields, such as soft robotics, wearables, as well as micro electro-mechanical systems (MEMS). To generate a stroke, a membrane DE actuator (DEA) must be coupled with a mechanical biasing system. It is well known that nonlinear elements, such as negative-rate biasing springs (NBS), permit a remarkable increase in the DEA stroke in comparison to standard linear springs. Common types of NBS, however, are generally manufactured with rigid components (e.g., steel beams, permanent magnets), thus they appear as unsuitable for the development of compliant actuators for soft robots and wearables. At the same time, rigid NBSs are hard to miniaturize and integrate in DE-based MEMS devices. This work presents a novel type of soft DEA system, in which a large stroke is obtained by using a fully polymeric dome as the NBS element. More specifically, in this paper we propose a model-based design procedure for high-performance DEAs, in which the stroke is maximized by properly optimizing the geometry of the biasing dome. First, a finite element model of the biasing system is introduced, describing how the geometric parameters of the dome affect its mechanical response. After conducting experimental calibration and validation, the model is used to develop a numerical design algorithm which finds the optimal dome geometry for a given DE membrane characteristics. Based on the optimized dome design, a soft DEA prototype is finally assembled and experimentally tested.

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Feasibility of a Dielectric Elastomer Augmented Aorta

Cited by 34 publications

References 56 publications

Viscoelastic Effects on the Response of Electroelastic Materials

Viscoelastic Effects on the Response of Electroelastic Materials

Low‐Voltage Soft Actuators for Interactive Human–Machine Interfaces

Model-Based Design Optimization of Soft Polymeric Domes Used as Nonlinear Biasing Systems for Dielectric Elastomer Actuators

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