Comput.Mater.Sci. 3, 263-278, 1994
E.Weissenbek, H.J. Böhm and F.G. Rammerstorfer
Institute of Lightweight Structures and Aerospace
Christian Doppler Laboratory for Micromechanics of Materials,
TU Wien, Vienna, Austria
The influence of inclusion arrangements and shapes on the mechanical and
thermomechanical behavior predicted by unit cell descriptions of particle
reinforced metal matrix composites is investigated.
Three-dimensional cubic geometries, axisymmetric models and plane
geometries are compared, and all periodic arrangements of inclusions are
shown to display at least some degree of three-dimensional anisotropy
under mechanical loading.
Deviations from isotropy are more marked for simple cubic than for body
centered and face centered cubic arrangements in both the elastic and
inelastic ranges, and the overall linear and nonlinear responses predicted
by axisymmetric models are found to be in good agreement with the
three-dimensional cubic descriptions.
The thermal expansion behavior of cubic models is isotropic provided cube-shaped or spherical inclusions are used. However, both axisymmetric descriptions and cylindrical inclusions in three-dimensional models give rise to noticeable anisotropies in the predicted overall response to a thermal load.