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Thermal stress analysis for coated fibers

Published online by Cambridge University Press:  03 March 2011

M.G. Ellenburg
Affiliation:
Georgia Institute of Technology, Atlanta, Georgia 30332
J.A. Hanigofsky
Affiliation:
Georgia Institute of Technology, Atlanta, Georgia 30332
W.J. Lackey
Affiliation:
Georgia Institute of Technology, Atlanta, Georgia 30332
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Abstract

Thermal stresses induced during cooling from temperatures used for coating deposition were calculated for various fiber-coating systems. Systems under study include several types of carbon, alumina, and zirconia fibers. Coatings considered were TiB2, Si3N4, and SiC. Typical calculated stresses were on the order of 0 to 2 GPa. The results were used to analyze the effects of variable physical parameters such as coating thickness and crystallographic orientation on the stress levels. Each fiber-coating system was then compared using a nominal coating thickness of 5 μm in order to rank the various fiber-coating combinations. Among the results obtained, it was shown that orientation of deposited coatings usually leads to higher tensile stresses.

Type
Articles
Copyright
Copyright © Materials Research Society 1994

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References

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