Elastic Properties of Model Porous Ceramics.
Elastic Properties of Model Porous Ceramics.
(1335 K)
Roberts, A. P.; Garboczi, E. J.
Journal of the American Ceramic Society, Vol. 83, No.
12, 3041-3048, 2000.
Keywords:
ceramics; finite element method; pores; Poisson's ratio;
Young's modulus
Abstract:
The finite element method (FEM) is used to study the
influence of porosity and pore shpae on the elastic
properties of model porous ceramics. We use the FEM to
measure the Young's modulus and Poisson's ratio of
models with three different kinds of pores: overlapping
spherical pores, overlapping ellipsoidal pores, and
overlapping solid spheres. The Young's modulus of each
model can be epxressed as a simple function of porosity,
and was found in each case to be independent of the
solid Poisson's ratio. At a sufficiently high porosity
the Poisson's ratio of the porous models converged to a
fixed value independent of the solid Poisson's ratio.
The FEM results were in good agreement with experimental
data when the model morphology closely mimicked the
actual ceramic microstructure. The results can be used
to predict the elastic properties of ceramics, and allow
the accurate interpretation of empirical
property-porosity relations in terms of pore shape and
structure.
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National Institute of Standards and Technology
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