Original scientific paper

Evaluation of effective thermoelastic properties of random fibrous composites

Michal Šejnoha ; Faculty of Civil Engineering, Dept. of Structural Mechanics, Prague, CZECH REPUBLICK
Jan Zeman ; Klokner Institute, Department of Mechanics, Prague, CZECH REPUBLICK
Jiri Šejnoha ; Faculty of Civil Engineering Dept. of Structural Mechanics, Prague, CZECH REPUBLICK

Abstract

Effective thermoelastic material properties are found for random fibrous composite systems. In particular, the graphite fiber tow embedded in the polymer matrix is selected as a representative of the two-phase disordered composite media. Two approaches to the evaluation of effective properties are described. The first one utilizes the extended form of the Hashin-Shtrikman variational principle, which directly incorporates certain microstructure describing functions to generate bounds on effective thermoelastic properties. The second approach relies on the construction of a periodic unit cell which statistically resembles the real microstructure. Standard homogenization procedure based on the stress control is then invoked to generate a system of governing equations for the estimation of overall thermoelastic properties of the composite. Several numerical results are presented for the selected material system.

Keywords

thermoelastic properties, fibrous composite, two-phase composite media, random microstructure

Hrčak ID:

318830

URI

https://hrcak.srce.hr/318830

Publication date:

7.12.2000.

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