Interface Fatigue Crack Propagation in Ceramic Thermal Barrier Coatings
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- MUTOH Yoshiharu
- Department of Mechanical Engineering, Nagaoka University of Technology
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- XU Jin-Quan
- Department of Mechanical Engineering, Nagaoka University of Technology
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- MIYASHITA Yukio
- Department of Mechanical Engineering, Nagaoka University of Technology
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- BERNARDO Gomez G.
- Graduate student, Nagaoka University of Technology
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- TAKAHASHI Masashi
- Toshiba Co. Ltd.
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説明
Failure of thermal barrier coating (TBC) layer, especially spalling of ceramic coating layer, results not only in degradation of thermal barrier properties but also in crucial damage to turbine components. The spalling of ceramic coating layer will follow the crack initiation and propagation along the interface between ceramic top-layer and metal bond-layer. In the present study, fatigue crack growth tests of TBCs with various porosities were carried out at room and elevated temperatures. It is found that an interface crack induced near a pre-introduced notch propagates along the interface under mixed mode condition, and its growth behavior can be well characterized by using the parameter ΔKi=Δ√(K12+K22), which corresponds to the energy release rate. It is also found that the crack propagation resistance decreases with increasing of the porosity of the top ceramic coating. The crack propagation resistance at elevated temperature becomes lower compared to that at room temperature.
収録刊行物
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- JSME International Journal Series A Solid Mechanics and Material Engineering
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JSME International Journal Series A Solid Mechanics and Material Engineering 46 (3), 403-408, 2003
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390282681469582336
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- NII論文ID
- 10016191746
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- NII書誌ID
- AA11179396
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- ISSN
- 13475363
- 13447912
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- NDL書誌ID
- 6602317
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDLサーチ
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