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Fibers 2017, 5(3), 30; doi:10.3390/fib5030030

The Thermal Conductivities of Periodic Fibrous Composites as Defined by a Mathematical Model

School of Applied Mathematics and Physical Sciences NTUA, Section of Mechanics, 5 Heroes of Polytechnion Avenue, GR-15773 Athens, Greece
Author to whom correspondence should be addressed.
Academic Editor: Sushanta Ghoshal
Received: 4 May 2017 / Revised: 1 August 2017 / Accepted: 4 August 2017 / Published: 14 August 2017
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In this paper, a geometric body-centered model to simulate the periodic structure of unidirectional fibrous composites is presented. To this end, three prescribed configurations are introduced to predict in a deterministic manner the arrangement of internal and neighboring fibers inside the matrix. Thus, three different representative volume elements (RVEs) are established. Furthermore, the concept of the interphase has been taken into account, stating that each individual fiber is encircled by a thin layer of variable thermomechanical properties. Next, these three unit cells are transformed in a unified manner to a coaxial multilayer cylinder model. This advanced model includes the influence of fiber contiguity in parallel with the interphase concept on the thermomechanical properties of the overall material. Then, by the use of this model, the authors propose explicit expressions to evaluate the longitudinal and transverse thermal conductivity of this type of composite. The theoretical predictions were compared with experimental results, as well as with theoretical values yielded by some reliable formulae derived from other workers, and a reasonable agreement was found. View Full-Text
Keywords: fibrous composites; periodic structure; fiber contiguity; interphase; thermal conductivities fibrous composites; periodic structure; fiber contiguity; interphase; thermal conductivities

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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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Venetis, J.; Sideridis, E. The Thermal Conductivities of Periodic Fibrous Composites as Defined by a Mathematical Model. Fibers 2017, 5, 30.

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