Modeling of a dielectric elastomer diaphragm for a prosthetic blood pump

Goulbourne, Nakhiah C.; Frecker, Mary; Mockensturm, Eric M.; Snyder, Alan J.

doi:10.1117/12.484388

Cited by 52 publications

(42 citation statements)

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“…Researchers including Pelrine et al (2000a), Kofod (2001), and Goulbourne et al (2003Goulbourne et al ( , 2004 have successfully applied such continuum models for hyper-elastic materials to DEAs but have not studied their failure modes. The viscoelastic behavior of DEA films has been investigated by Larsen et al (2002) using a MooneyRivlin model with Maxwell viscosity.…”

Section: Introductionmentioning

confidence: 98%

Large-scale failure modes of dielectric elastomer actuators

Plante

Dubowsky

2006

International Journal of Solids and Structures

558

454

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Dielectric elastomer actuators (DEAs) show promise for robotic and mechatronic applications. However, to date, these actuators have experienced high rates of failure that have prevented their practical application. Here, large scale modes of failure of DEAs and their performance limits are studied. The objective is to provide design guidelines and bound the performance of DEAs that avoid failure. An idealized DEA is modeled and its failure is predicted as a function of film prestretch used during actuator fabrication, actuation voltage, and stretch rate. Three failure modes are considered: pull-in, dielectric strength, and material strength. Each failure mode is shown to dominate for different combinations of pre-stretch and stretch rate. High stretch rates lead to dielectric strength failure while low stretch rates lead to pull-in failure. Material strength failure is less important for most cases. Model predictions are validated experimentally using practical DEAs operating under load. This study suggests that DEAs cannot be operated reliably under load for long periods of time or low stretch rates due to pull-in failure limitations. To be reliable, DEAs must be used for short periods of time with high stretch rates.

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Section: Introductionmentioning

confidence: 98%

Large-scale failure modes of dielectric elastomer actuators

Plante

Dubowsky

2006

International Journal of Solids and Structures

558

454

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“…Although EEAP require high voltages, the advantages such as rapid response, the ability to induce relatively large actuation forces, the ability to operate in room conditions for a long period of time and, most importantly, the ability to hold the induced displacement under activation of a voltage make them ideally suited candidates for various types of actuators 2 . Potential applications of EEAP include artificial muscles, robotic systems such as mobile mini-and micro-robots, micro-pumps, micro-valves, micro-air vehicles, disk drives, prosthetic devices and flat panel loudspeakers, see the non-exhaustive list of examples contained in the works by Heydt et al (1998), Eckerle et al (2001), Kim et al (2001), , , Pelrine et al (2002), Sommer-Larsen et al (2002), Wingert et al (2002), Carpi et al (2003), Goulbourne et al (2003), Pei et al (2003), Lacour et al (2004), Trujillo et al (2004), Kofod and Sommer-Larsen (2005), Zhang et al (2005), Loverich et al (2006), Wingert et al (2006), Zhang et al (2006).…”

Section: Introductionmentioning

confidence: 98%

Computational Nonlinear Electro-Elasticity — Getting Started —

Steinmann

2011

CISM International Centre for Mechanical Sciences

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Abstract. The intention of this contribution is to provide the basic ingredients needed for the formulation and computation of nonlinear problems in electro-elasticity. Thus, firstly the underlying variational setting of nonlinear electro-elasticity is outlined. Then, secondly the appropriate discretization in terms of the finite element method combined with the boundary element method together with the corresponding solution method are discussed in much detail. Finally the solution of some nonlinear boundary value problems demonstrates the applicability of the derived methods and highlights the characteristic features of coupled problems in nonlinear electro-elasticity.

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“…PEI, et al [2] , used spring roll as multifunctional robot leg and the speed of robot was as high as 2.7 in/s (6.858 cm/s). GOULBOURNE, et al [3] , modeled a dielectric elastomer diaphragm for a prosthetic blood pump. dielectric elastomer actuator (DEA) could also be used to continuously adjust the properties of diffractive optical element [4] .…”

Section: Introduction *mentioning

confidence: 99%

Performance Investigation of Cone Dielectric Elastomer Actuator Using Taguchi Method

HM(王化明)¹,

YL²,

DB³

et al. 2011

CJME

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Dielectric elastomer actuator (DEA) show promise for mechatronic applications due to the advantages of dielectric elastomer, such as lightweight, flexible, low cost, high strain, etc, and many configurations of DEAs have been demonstrated. As a kind of linear actuator, cone DEAs are studied in some laboratory prototypes due to easy manufacturing, however, their performance have not been exploited fully. Based on the working principle of DEA, a four-bar linkage mechanism is designed to provide negative stiffness preload, which can increase displacement output of actuator (outer diameter 100 mm) to 17 mm. Three cone actuating units are assembled in parallel to enhance the maximum force output to 5.07 N. Loading experiments of actuator in forward and backward strokes are performed, the experimental results show that backward stroke has stronger actuating capability than forward stroke, accordingly application of actuator is recommended. Four factors rather than applied voltage, i.e., number of actuating units, pre-stretch ratio, inner diameter, and outer diameter, are determined as influencing factors for Taguchi method. Then the performance objectives of actuator, i.e., displacement output, maximum force output, and maximum work in backward stroke, are investigated based on L 9 (3 4 ) Taguchi orthogonal design. The mean signal-to-noise (S/N) ratio based on the larger-the-better criterion is calculated according to the acquired displacement and force output. Analytical results show that outer diameter has the most significant influence on displacement output, and maximum force out and work output are influenced most by number of actuating units. Inner diameter also has an important effect on the performance objectives of actuator, while pre-stretch ratio has the least influence. The proposed performance investigation is helpful for the design and application of cone actuator in mechatronic system.

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Modeling of a dielectric elastomer diaphragm for a prosthetic blood pump

Cited by 52 publications

References 1 publication

Large-scale failure modes of dielectric elastomer actuators

Large-scale failure modes of dielectric elastomer actuators

Computational Nonlinear Electro-Elasticity — Getting Started —

Performance Investigation of Cone Dielectric Elastomer Actuator Using Taguchi Method

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