Effect of fiber alignment on dielectric response in the 1–3 connectivity fiber/polymer composites by quantitative evaluation

Recent advances in the electrospinning technique offer significant opportunities for improved fiber reinforced polymer composites of interest for capacitor applications. Classical effective medium approximation may fail to reach exact solutions due to the intricately inhomogeneous distribution of th...

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Bibliographic Details
Published in:Applied physics letters 2018-09, Vol.113 (12)
Main Authors: Zhong, Shao-Long, Yin, Li-Juan, Pei, Jia-Yao, Li, Xiang-Yu, Wang, Si-Jiao, Dang, Zhi-Min
Format: Article
Language:English
Subjects:
Alignment
Applied physics
Composite materials
Depolarization
Effective medium theory
Fiber composites
Fiber reinforced plastics
Fiber reinforced polymers
Finite element method
Mathematical models
Permittivity
Polymer matrix composites
Polymers
Quantitative analysis
Three dimensional models
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Summary:Recent advances in the electrospinning technique offer significant opportunities for improved fiber reinforced polymer composites of interest for capacitor applications. Classical effective medium approximation may fail to reach exact solutions due to the intricately inhomogeneous distribution of the depolarizing field in fibers with arbitrary orientation degrees. In this work, a three-dimensional finite element method (FEM) model has been developed to in-depth study the effects of fiber alignment on the dielectric response in fiber/polymer composites. A quantitative relationship between the effective permittivity of composites and the alignment degree of fiber has been initially established. Furthermore, we define a parameter of the effective angle which has the equivalent contribution on the effective permittivity with the actually distributed multiple alignment angles of fibers in practical composite materials. The calculation results with FEM show good agreement with the experiment measurements delivered recently.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5049122