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MODELING AND ADAPTIVE NUMERICAL TECHNIQUES FOR OXI-DATION OF CERAMIC COMPOSITES
 

Summary: MODELING AND ADAPTIVE NUMERICAL TECHNIQUES FOR OXI-
DATION OF CERAMIC COMPOSITES
S. Adjerid, M. Ai a, J. E. Flaherty, J. B. Hudson, M. S. Shephard
Scienti c Computation Research Center
Rensselaer Polytechnic Institute
Troy, NY 12180-3590
ABSTRACT
We develop a mathematical model for the oxidation of silicon carbide in
a crack or pore. The model consists of a nonlinear partial di erential system
that is solved by adaptive nite element software that automates many of
the computational decisions.
1. INTRODUCTION
Oxidation shortens the life of ceramic matrix composites by, e.g., chang-
ing the elastic properties of the medium, reducing bonding strength due to a
loss of ber coatings, and weakening bers through reaction 1-3 . Composite
materials are protected by coatings; however, cracks that form as a result of
thermal or other loading may expose the matrix and bers to hostile envi-
ronments. We present a model for the oxidation of a cracked silicon carbide
SiC matrix that is exposed to a hot gaseous mixture of oxygen and water.
The gases di use into the matrix and react with the SiC to form a layer of

  

Source: Adjerid, Slimane - Department of Mathematics, Virginia Tech

 

Collections: Mathematics