COMPOSITES WITH FUNCTIONALLY GRADED INTERPHASES: MESOCONTINUUM CONCEPT AND EFFECTIVE TRANSVERSE CONDUCTIVITY

摘要

We consider a unidirectional fiber-reinforced composite with an interphase between the tiber and matrix taken as a graded zone of two randomly interpenetrating phases of these materials. In particular, we take this interphase as a functionally graded material (FGM). The objective of this paper is to present a micromechanics based method to treat FGM and to calculate the effective macroscopic properties (transverse conductivity, or, equivalently, axial shear modulus) of such a composite material. This problem requires the treatment of several length scales: the fine interphase microstructure, its mesocontinuum representation, the fiber size, and the macroscale level (of many fibers) at which the effective properties are defined.