Material Characterization And Modeling Of
Carbon–carbon Textile Composites
Author(s)
J. Vorel, J. Nˇemeˇcek & M. ˇSejnoha
Abstract
Material modeling plays an irreplaceable role in assessing the practical applicability
of any type of material system. A successful approach requires with no doubt a
combination of experimental measurements with predictive numerical simulations.
While numerical simulations of complex heterogeneous materials often rely on the
well established concept of the statistically equivalent periodic unit cell, its formulation
for complex material systems, such as carbon–carbon (C/C) composites, is
far from trivial, particularly in view of a hardly negligible intrinsic porosity of
these material systems. Here reliable information about the actual size, shape and
distribution of pores in the composite are provided using X-Ray microtomography
combined with two-dimensional images of composite sections. Similarly, difficulties
arise when searching for reliable material data of individual constituents.
Although usually supplied by the manufacturer, the material properties of individual
constituents may significantly deviate from these values when introduced into
the composite. To add credibility to numerical predictions the properties derived
from nanoindentation tests performed directly on the composite are adopted. The
proposed synergy of experimental and numerical modeling is exploited here to
provide estimates of the elastic stiffnesses of porous multilayer C/C composites
with imperfect microstructure.
Keywords: nanoindentation, microtomography, statistically equivalent periodic unit cell, homogenization, C/C textile composites, porosity.
1 Introduction
While the application of PUCs in problems of strictly periodic media has a rich
history, their introduction in the field of random or imperfect microstructures is
Keywords
nanoindentation, microtomography, statistically equivalent periodic unit cell, homogenization, C/C textile composites, porosity
Related Book
Other papers in this volume
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