High Sensitive NDE of Subsurface Local Damage in Thermal Barrier Coating System by the Laser Speckle Method

Waki, Hiroyuki; Nishikawa, Izuru; Kobayashi, Akira

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タイトル	High Sensitive NDE of Subsurface Local Damage in Thermal Barrier Coating System by the Laser Speckle Method
著者	Waki, Hiroyuki Waki, Hiroyuki
	Nishikawa, Izuru Nishikawa, Izuru
	Kobayashi, Akira Kobayashi, Akira
キーワード等	NDE
	Thermal Barrier Coating
	Delamination
	Fatigue
	Plasma Spraying
	Surface Strain
	Laser Speckle
抄録	Thermal barrier coatings (TBCs) have been used for insulating a substrate from high temperature in gas turbine plants. High temperature fatigue strength has been an important problem for these components. However, nondestructive evaluation (NDE) of subsurface delamination for a thermal-barrier-coated material has been so difficult that the effect of delamination on the fatigue fracture life of a substrate hasn't been well studied. The relationship between surface strain behavior and the state of any subsurface delamination for a TBC material is described in this paper. Tension-compression fatigue tests were carried out at 873K and room temperature for ZrO₂-8Y₂O₃-sprayed and Al₂O₃-sprayed specimens. Surface strain behavior during the fatigue test was measured using the laser speckle method. It was found that surface strain was fully reflected by substrate strain unless subsurface delamination was initiated, while surface strain was found to decrease when subsurface delamination was initiated. All the surface strain behaviors were classified in five patterns, and they were related to the state of subsurface delamination. It was concluded that the surface strain beside a crack was sensitive to the subsurface damage and applicable for evaluating subsurface damage.
公開者	大阪大学接合科学研究所
公開者の別表記	Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)	オオサカダイガクセツゴウカガクケンキュウジョ
掲載誌名	Transactions of JWRI
巻	36
号	1
開始ページ	103
終了ページ	108
刊行年月	2007-07
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/7641
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.36 No.1 (2007-07)

著者版フラグ	publisher
NII資源タイプ	紀要論文
ローカル資源タイプ	紀要論文
dcmi資源タイプ	text
DCTERMS.bibliographicCitation	Transactions of JWRI.36(1) P.103-P.108
DC.title	High Sensitive NDE of Subsurface Local Damage in Thermal Barrier Coating System by the Laser Speckle Method
DC.creator	Waki, Hiroyuki
	Nishikawa, Izuru
	Kobayashi, Akira
DC.publisher	大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2007-07
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/7641
DC.subject	NDE
	Thermal Barrier Coating
	Delamination
	Fatigue
	Plasma Spraying
	Surface Strain
	Laser Speckle
DCTERMS.abstract	Thermal barrier coatings (TBCs) have been used for insulating a substrate from high temperature in gas turbine plants. High temperature fatigue strength has been an important problem for these components. However, nondestructive evaluation (NDE) of subsurface delamination for a thermal-barrier-coated material has been so difficult that the effect of delamination on the fatigue fracture life of a substrate hasn't been well studied. The relationship between surface strain behavior and the state of any subsurface delamination for a TBC material is described in this paper. Tension-compression fatigue tests were carried out at 873K and room temperature for ZrO₂-8Y₂O₃-sprayed and Al₂O₃-sprayed specimens. Surface strain behavior during the fatigue test was measured using the laser speckle method. It was found that surface strain was fully reflected by substrate strain unless subsurface delamination was initiated, while surface strain was found to decrease when subsurface delamination was initiated. All the surface strain behaviors were classified in five patterns, and they were related to the state of subsurface delamination. It was concluded that the surface strain beside a crack was sensitive to the subsurface damage and applicable for evaluating subsurface damage.
citation_title	High Sensitive NDE of Subsurface Local Damage in Thermal Barrier Coating System by the Laser Speckle Method
citation_author	Waki, Hiroyuki
	Nishikawa, Izuru
	Kobayashi, Akira
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2007-07
citation_journal_title	Transactions of JWRI
citation_volume	36
citation_issue	1
citation_firstpage	103
citation_lastpage	108
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/7641
citation_keywords	NDE
	Thermal Barrier Coating
	Delamination
	Fatigue
	Plasma Spraying
	Surface Strain
	Laser Speckle

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