Comput.Mater.Sci. 25, 42-53, 2002
H.J. Böhm, A. Eckschlager, W. Han
Christian Doppler Laboratory for Functionally Oriented
Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria
A multi-inclusion unit cell approach is employed to study the elastic and
elastoplastic behavior of metal matrix composites (MMCs) reinforced by
randomly oriented short fibers.
Periodic arrangements of 15 identical fibers of spheroidal or cylindrical shape
with an aspect ratio of 5 and a reinforcement volume fraction of 15% are
generated by a random sequential adsorption algorithm.
The overall responses of the resulting unit cells under uniaxial tensile
loading and the corresponding microscale stress and strain fields are evaluated
via the Finite Element method.
In addition, a microgeometry containing 15 identical spherical particles at the
same volume fraction is studied for comparison.
Effects of the reinforcement types and shapes in the elastic and elastoplastic ranges are studied and the predicted microfields are discussed in terms of their phase averages and the corresponding standard deviations. Weibull-type fracture probabilities are used to assess the vulnerability of the fibers or particles to brittle fracture.