J.Compos.Mater. 40(24), 2217-2234, 2006
D. Duschlbauer¹, H.J. Böhm²,
¹VIPAC Engineers and Scientists Ltd.,
Lane Cove, Australia
²Institute of Lightweight Design and Structural Biomechanics,
TU Wien, Vienna, Austria
The linear thermoelastic and thermophysical behavior of a short fiber
reinforced composite material with planar random fiber arrangement is
investigated by advanced numerical and analytical micromechanical methods.
On the one hand, finite element based multi-fiber unit cells are introduced
that contain 40-50 short fibers in arrangements approximating 2D random
On the other hand, the same fiber arrangements are investigated by an extended
Mori-Tanaka mean field approach that can handle both statistical and discrete
descriptions of the fiber orientations.
Within the Mori-Tanaka scheme average microfields are extracted for individual
fibers, and finite-length cylindrical reinforcements are modeled via averaged
dilute concentration tensors that are evaluated numerically by finite element
Homogenization and localization are performed for a metal matrix composite
consisting of copper, reinforced by 21 vol% of carbon fibers that closely
approximate a planar random arrangement.
Simulation results on the macroscopic and microscopic linear elastic,
thermoelastic, and thermal conductivity responses obtained by the two
approaches are compared and excellent agreement is found.