USE OF COMPOSITE CYLINDER MODEL AS REPRESENTATIVE
VOLUME ELEMENT FOR UNIDIRECTIONAL FIBER COMPOSITES
P. Tandon, AdTech Systems Research, Inc.
present work is concerned with the theoretical study of the elastic
properties of unidirectional fiber composites. The approach to calculate
the effective moduli of composite materials is generally based upon
the premise of a representative volume element, or an element in
which the strain and stress averages taken over large enough subregions
of the specimen are the same for any such subregion. For purposes
of computation, some model of a fiber composite must be assumed.
The objective of this study is to demonstrate that the composite
cylinder model can provide a good simulation for the representative
volume element to define the response of a unidirectional composite
for a wide range of elastic moduli and volume fraction provided
the displacements are prescribed on the external surfaces. Results
of the effective elastic moduli and micro-stresses within the constituents
are compared with existing numerical solutions, both with and without
partial interphase failure, to demonstrate the effectiveness of
composite cylinder model to simulate composite behavior.