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J. Manuf. Mater. Process. 2017, 1(2), 22; doi:10.3390/jmmp1020022

Pearl-Chain Formation of Discontinuous Carbon Fiber under an Electrical Field

1
Mechanical Engineering Department, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL 32310, USA
2
Additive Manufacturing for Fuze Electronics & Design Fuzes Branch, Eglin AFB, Valparaiso, FL 32542, USA
*
Author to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 16 November 2017 / Accepted: 21 November 2017 / Published: 5 December 2017
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Abstract

The purpose of this paper is to develop a theoretical derivation on aligning discontinuous carbon fiber with an applied electric field, and prove the theory with experiment. A principle with regard to the occurrence of carbon fiber alignment is presented after an introduction of the electromechanical quantities of dielectrics. Based on this principle, an estimation of the polarizability tensor is employed to calculate the required electric field to achieve fiber alignment in liquid solution (e.g., water, resin, etc.). Individual carbon fiber is modeled as a polarizable dielectric cylinder in liquid resin and its motion under direct current (DC) electrical field is decomposed into a polarization effect and rotation effect. A value of 20.12 V/mm is required to align short carbon fibers (0.15 mm) long in liquid resin and is experimentally validated. Finally, an expression to include weight percentage as a means of controlling pearl-chain formation is derived to change the composite’s electrical conductivity. View Full-Text
Keywords: polarization; carbon fiber alignment; pearl-chain formation polarization; carbon fiber alignment; pearl-chain formation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Daniel, J.; Ju, L.; Yang, J.; Sun, X.; Gupta, N.; Schrand, A.; Xu, C. Pearl-Chain Formation of Discontinuous Carbon Fiber under an Electrical Field. J. Manuf. Mater. Process. 2017, 1, 22.

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