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11:00 AM *BB7.2
MECHANISM-BASED FAILURE
PREDICTION FOR THERMAL BARRIER COATINGS. A. Evans,
Harvard University, Cambridge, MA.
The evolution of
cracks that lead to the eventual spalling of thermal barrier coatings
is discussed. Mechanic solutions that characterize each step in this
evolution are presented and compared with experimental findings.
Particular emphasis is given to the initial formation of separation at
the bond coat/oxide interface, inclusion of the effect of segregation.
Preliminary life models are presented.
System Administrator
11/13/1997