Composites 28B, 253-265, 1997
H.E. Pettermann, H.J. Böhm and F.G. Rammerstorfer
Institute of Lightweight Structures and Aerospace
TU Wien, Vienna, Austria
A Mori-Tanaka mean-field approach for predicting the overall thermoelastic
properties of multi-phase composites with given orientation distributions of
the inclusion phases is used to study the influence of the inclusion
orientation distribution on the effective material properties.
The aim of this study is primarily to understand the effects of the
inclusion orientations in short-fiber-reinforced composites and to identify
the basic mechanisms of interaction between the phases which govern the
overall thermoelastic behavior.
Perfectly aligned discontinuous fibers, various orientation distributions
as well as two-dimensional and three-dimensional random orientations of the
inclusions are studied.
The overall Young's moduli, shear moduli and coefficients of thermal
expansion, as well as the onset of yielding of the matrix phase under
thermal and mechanical loading conditions, are calculated.
The results are evaluated both in terms of the orientation distributions of
the inclusions and in terms of the direction dependences of the predicted
From these findings useful information on the appropriate requirements
for the design of composite materials and composite structures can be