Abstract
Expressions for the evaluation of the transverse and longitudinal elastic moduli and the major Poisson ratio of unidirectional fiber composites are derived. The model described is based on the correct version of Kerner's model, which in our case is conveniently modified by introducing a mesophase layer between the fiber and the matrix in the representative volume element surrounding the typical fiber. The expression for the longitudinal elastic modulus derived in this paper, and the law of mixtures already presented in previous papers, give concordant results. Therefore, the law of mixtures, taking the mesophase also into account, and the two-term unfolding model for the mesophase are used for the evaluation of its extent and its properties. The model was applied to a glass filament-epoxy resin composite and its predictions were found to be in good agreement with the experimental data.
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Theocaris, P.S., Varias, A.G. The influence of the mesophase on the transverse and longitudinal moduli and the major poisson ratio in fibrous composites. Colloid & Polymer Sci 264, 561–569 (1986). https://doi.org/10.1007/BF01412593
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DOI: https://doi.org/10.1007/BF01412593