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論文情報
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
Transactions of JWRI / Vol.36 No.1 (2007-07)
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著者版フラグ
publisher
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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