Preprint Article Version 2 This version is not peer-reviewed

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

Version 1 : Received: 6 May 2017 / Approved: 8 May 2017 / Online: 8 May 2017 (10:31:50 CEST)
Version 2 : Received: 13 August 2017 / Approved: 14 August 2017 / Online: 14 August 2017 (04:20:11 CEST)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Fibers 2017, 5, 30
DOI: 10.3390/fib5030030

Abstract

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.

Subject Areas

fibrous composites; periodic structure; fiber contiguity; interphase; thermal conductivities

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