Journal Published Online: 01 October 1999
Volume 21, Issue 4

Modeling of Thermal Stresses in Yttrium Aluminum Garnet and Alumina Fibers Coated with β″-Alumina

CODEN: JCTRER

Abstract

Since layered aluminate coatings such as β″-alumina are being considered for tailoring the interfacial properties of oxidation-resistant fiber-reinforced composites, stresses arising from thermal expansion mismatch were calculated for the substrate fiber and coating. Both isotropic and anisotropic β″-alumina coatings were analyzed for yttrium aluminum garnet and single crystal and polycrystalline alumina fibers. It was possible to rank the various fiber-coating combinations in terms of the magnitude of maximum tensile stresses present in the coating. Polycrystalline alumina + isotropic β″-alumina yielded the lowest tensile stresses with radial stress on the order of 10 MPa, while single crystal alumina + anisotropic β″-alumina yielded the highest tensile stresses with tangential stress on the order of >100 MPa.

Author Information

Ellenburg, MG
Georgia Institute of Technology, Atlanta, GA
Lackey, WJ
George W. Woodruff School of Mechanical Engineering, Atlanta, GA
Pages: 9
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Stock #: CTR10982J
ISSN: 0884-6804
DOI: 10.1520/CTR10982J