Effect of aspect ratio on the electroelastic properties of piezoelectric nanocomposites

Andrews, Clark; Lin, Yirong; Sodano, Henry A.

doi:10.1117/12.815136

Cited by 2 publications

(5 citation statements)

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“…For the case of randomly oriented nanowires similar results can be inferred. Through a convergence study, it was established that the nanowires with AR greater than 100 can be considered as continuous fibers which indicate that further increase in AR has little to no effect on the overall d 31 coefficient [20,39].…”

Section: Model Validation and Discussionmentioning

confidence: 99%

“…Where S denotes the Eshelby's tensor which is a function of Poisson ratio of the matrix and the inclusion morphology. For the case of piezoelectric nanowires, they can be generalized as ellipsoidal inclusions [20,39]. The Eshelby's tensor is widely used in micromechanics models for calculation of bulk composite properties.…”

Section: Mean Field Micromechanicsmentioning

confidence: 99%

“…These tensors are expressed in four integral equations which the closed form solutions have only been identified for the case of infinitely long aligned fibers [46], spheroidal inclusions [47], and polygons [48]. Here, to calculate the constraint tensors of finite AR fibers, a similar method as Andrews, et al [20] and Gavazzi et al [49] was adopted for numerically calculating the Eshelby's tensor using Gaussian quadrature which discretizes the integrals into a weighted summation of a finite number of function values.…”

Section: Mean Field Micromechanicsmentioning

confidence: 99%

“…However, when compared to monolithic form, reported nanocomposites have a significantly lower electomechanical coupling coefficient, which makes them inadequate for many engineering applications. Recent work has shown that the use of higher aspect ratio (AR) piezoelectric fillers could enable greater electromechanical coupling coefficients at the same volume fraction as their equiaxial counterparts [19][20][21][22][23][24][25][26][27]. For instance, Feenstra and Sodano have reported a 300% increase in coupling by the use of high AR, electrospun fibers instead of spherical nanoparticles [22].…”

Section: Introductionmentioning

confidence: 99%

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Electromechanical modeling and experimental verification of a direct write nanocomposite

Nafari

Sodano

2019

Smart Mater. Struct.

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Piezoelectric materials are currently among the most promising building blocks for sensing, actuation and energy harvesting systems. However, these materials are limited in certain applications due to their lack of machinability as well as their inability to conform to curved surfaces. One method to mitigate this issue is through additive manufacturing (direct printing) of piezoelectric nanocomposites, where piezoelectric nanomaterials are embedded in a polymer matrix. Although significant progress has been made in this area, filler morphology, alignment and volume fraction are critical parameters that influence the electromechanical response and have not been adequately modeled. With the advent of additive manufacturing it is now possible to realize directly printed nanocomposites with tailored microstructure. The objective of this study is to develop and experimentally validate micromechanical and finite element models that allow the study of the electroelastic properties of a directly printed nanocomposite containing piezoelectric inclusions. Furthermore, the dependence of these properties on geometrical parameters such as aspect ratio and alignment of the active phase are investigated. In particular, the core focus of this work is to demonstrate how the gradual alignment of piezoelectric nanowires in the nanocomposite from randomly oriented to purely aligned can improve electroelastic properties of a printed nanocomposite. Finally, this work provides the first experimental validation of the theoretical and FEM models through measurement of the electroelastic properties of the nanocomposites containing barium titanate nanowires in a polydimethylsiloxane (PDMS) polymer matrix.

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Section: Model Validation and Discussionmentioning

confidence: 99%

Section: Mean Field Micromechanicsmentioning

confidence: 99%

Section: Mean Field Micromechanicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electromechanical modeling and experimental verification of a direct write nanocomposite

Nafari

Sodano

2019

Smart Mater. Struct.

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“…For example, the dielectric breakdown strength of 2.5 vol % TO NWs/P(VDF-HFP) nanocomposites reached 520 MV/m because of the great compatibility between polymer and filler ( Wang et al., 2017a , 2017b ). In practical experiments and applications, the orientation of 1D nanofillers inside a polymer is of great importance, because the alignment affects the dielectric, ferroelectric and energy storage performances of nanocomposites ( Zhang et al., 2018c ; Andrews et al., 2010 ; Tang et al., 2012 ). In early research, Tang et al.…”

Section: Polymer Nanocomposites With Ceramic Nanofillersmentioning

confidence: 99%

High-energy-density polymer dielectrics via compositional and structural tailoring for electrical energy storage

et al. 2022

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Effect of aspect ratio on the electroelastic properties of piezoelectric nanocomposites

Cited by 2 publications

References 0 publications

Electromechanical modeling and experimental verification of a direct write nanocomposite

Electromechanical modeling and experimental verification of a direct write nanocomposite

High-energy-density polymer dielectrics via compositional and structural tailoring for electrical energy storage

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