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Combined Mode I and Mode II Fracture of Plasma-Sprayed Thermal Barrier Coatings at Ambient and Elevated TemperaturesThe mode I, mode II, and combined mode I-mode II fracture behavior of ZrO2- 8wt%Y2O3 thermal barrier coatings was determined in asymmetric flexure loading at both ambient and elevated temperatures. Precracks were introduced in test specimens using the single-edge-v-notched beam (SEVNB) method incorporated with final diamond polishing to achieve sharp crack tips. A fracture envelope of KI versus KII was determined for the coating material at ambient and elevated temperatures. Propagation angles of fracture as a function of K(sub I)/K(sub II) were also determined. The mixed-mode fracture behaviors of the coating material were compared with those of monolithic advanced ceramics determined previously. The mixed-mode fracture behavior of the plasma-sprayed thermal barrier coating material was predicted in terms of fracture envelope and propagation angle using mixed-mode fracture theories.
Document ID
20030112224
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Choi, Sung R.
(NASA Glenn Research Center Cleveland, OH, United States)
Zhu, Dongming
(NASA Glenn Research Center Cleveland, OH, United States)
Miller, Robert A.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Structural Mechanics
Meeting Information
Meeting: 27th Annual International Conference on Advanced Ceramics and Composites: Symposium on Advanced Ceramic Coatings for Structural, Environmental and Functional Applications
Location: Cocoa Beach, FL
Country: United States
Start Date: January 26, 2003
End Date: January 31, 2003
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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