Nonlinear Tensile and Shear Behavior of Macro Fiber Composite Actuators

Williams, R. Brett; Inman, Daniel J.; Schultz, Marc R.; Hyer, M. W.; Wilkie, W. Keats

doi:10.1177/0021998304040555

Cited by 103 publications

(83 citation statements)

References 6 publications

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“…This arrangement results in a highly orthotropic transducer element with larger flexibility perpendicular to the working direction compared to a monolithic piezoelectric wafer. The best know representatives of this group are the active fiber composite (AFC) [5] and the Macro Fiber Composite (MFC) [6].…”

Section: Models For Piezoelectric Elements With Idementioning

confidence: 99%

State of stress in piezoelectric elements with interdigitated electrodes

Paradies

Melnykowycz

2008

J Electroceram

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Finite element analyses have been performed on the representative volume element of piezoelectric elements with interdigitated electrodes (IDE). In these investigations the change of the piezoelectric material properties during polarization has been considered prior to additional service loads, e.g. mechanical loading. The numerical results obtained with a specially coded finite element routine are compared with a reference model given by the so called uniform field model. The model indicates stress concentrations at the tip of the finger electrode, which have been validated by experimental results. The modeling approach presented allows for a better understanding of the overall effects in piezoelectric materials with IDE.

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Section: Models For Piezoelectric Elements With Idementioning

confidence: 99%

State of stress in piezoelectric elements with interdigitated electrodes

Paradies

Melnykowycz

2008

J Electroceram

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“…In the early constitutive modeling efforts for 33-mode MFCs, Williams et al (2002Williams et al ( , 2004aWilliams et al ( , 2004b presented an experimentally validated model for equivalent thermal expansion and mechanical properties of MFCs using modified classical mixing rules. Deraemaeker et al (2009) reported the mixing rules-based calculations of the equivalent parameters and compared with manufacturer's data and experimental results.…”

Section: Introductionmentioning

confidence: 99%

Coupling of experimentally validated electroelastic dynamics and mixing rules formulation for macro-fiber composite piezoelectric structures

Shahab

Ertürk

2016

Journal of Intelligent Material Systems and Structures

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Piezoelectric structures have been used in a variety of applications ranging from vibration control and sensing to morphing and energy harvesting. In order to employ the effective 33-mode of piezoelectricity, interdigitated electrodes have been used in the design of macro-fiber composites which employ piezoelectric fibers with rectangular cross section. In this article, we present an investigation of the two-way electroelastic coupling (in the sense of direct and converse piezoelectric effects) in bimorph cantilevers that employ interdigitated electrodes for 33-mode operation. A distributedparameter electroelastic modeling framework is developed for the elastodynamic scenarios of piezoelectric power generation and dynamic actuation. Mixing rules (i.e. rule of mixtures) formulation is employed to evaluate the equivalent and homogenized properties of macro-fiber composite structures. The electroelastic and dielectric properties of a representative volume element (piezoelectric fiber and epoxy matrix) between two neighboring interdigitated electrodes are then coupled with the global electro-elastodynamics based on the Euler-Bernoulli kinematics accounting for twoway electromechanical coupling. Various macro-fiber composite bimorph cantilevers with different widths are tested for resonant dynamic actuation and power generation with resistive shunt damping. Excellent agreement is reported between the measured electroelastic frequency response and predictions of the analytical framework that bridges the continuum electro-elastodynamics and mixing rules formulation.

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“…The MFC actuator used to excite broadband waves is a flexible actuator developed in NASA Langley Research Center and commercialized in Smart Material Corp. (14) As shown in Fig. 1, the MFC consists of many thin rectangular PZT fibers sandwiched between layers of epoxy adhesive and polyimide film with electrodes.…”

Section: System Configurationmentioning

confidence: 99%

“…However, the authors have succeeded in receiving ultrasonic waves by using fiber Bragg grating (FBG) sensors that are a kind of optical fiber sensors (11)~ (13) . On the other hand, macro fiber composite (MFC) actuators developed in NASA consist of a lot of thin PZT fibers (14) and can be used as a generator of ultrasonic waves (15) . These components do not have the resonant frequency and have high directional characteristic because both of them are fibrous and flexible.…”

Section: Introductionmentioning

confidence: 99%

Damage Detection in Aircraft Composite Materials Using a Built-in Broadband Ultrasonic Propagation System

Okabe

Fujibayashi

Shimazaki

et al. 2011

JSDD

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As one of structural health monitoring systems, the authors developed a broadband ultrasonic propagation system using macro fiber composite (MFC) actuators and fiber Bragg grating (FBG) sensors. This system can send and receive broadband Lamb waves efficiently in a specific direction, and the MFCs and FBGs can be integrated into composite laminates because of their flexibility and high fracture strain. In this research, this system was applied to detect an interlaminar delamination in carbon fiber reinforced plastic (CFRP) laminates. One MFC and one FBG were bonded on each surface of the CFRP laminate to generate and receive the symmetric modes and the anti-symmetric modes separately for identification of the multiple modes of Lamb waves in the laminate. Then we investigated the mode conversion of Lamb waves at both tips of a delamination in the middle of the thickness of the laminate, through an experiment and finite element analysis (FEA). On the basis of the knowledge about the mode conversion, an index to evaluate the delamination length was proposed using velocity changes by the mode conversions. From the results of experiments and FEA for the laminates with an artificial delamination, this new index was found to be effective to evaluate the delamination progress in the laminate quantitatively.

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Nonlinear Tensile and Shear Behavior of Macro Fiber Composite Actuators

Cited by 103 publications

References 6 publications

State of stress in piezoelectric elements with interdigitated electrodes

State of stress in piezoelectric elements with interdigitated electrodes

Coupling of experimentally validated electroelastic dynamics and mixing rules formulation for macro-fiber composite piezoelectric structures

Damage Detection in Aircraft Composite Materials Using a Built-in Broadband Ultrasonic Propagation System

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