Seminar Series - 2000-2001

Porous materials with anisotropic microstructures:  Elastic and conductive properties, cross-property correlation.  Applications to plasma-sprayed coatings

Igor Sevostianov, Ph.D.
Department of Mechanical Engineering
Tufts University
Medford, Massachusetts   02155
 
Sponsored by the Dept. of Engineering Mechanics

Date: Monday, April 2, 2001
Time: 3:00 p.m.
Place: W128 Nebraska Hall

Materials with distributed cracks and pores of various shapes are analyzed.  The following results will be presented.

1.  Effective elastic properties and effective conductivities (thermal and electric), both generally anisotropic, are derived as functions of the porous space geometry (pore shapes, orientational distribution).  It is shown that the shapes of pores play a key role.  Quantitative characterization of the shape factors is developed.

2.  Cross property correlations between the elastic and the conductive properties are established in the explicit form.  This allows one to estimate the (anisotropic) elastic moduli from the conductivities (that are much easier to measure).

3.  Applications to plasma sprayed thermal barrier coatings are analyzed in detail. Explicit microstructure-property relations are developed. The results are in a good agreement with experimental data.


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