Crack Branching Phenomenon of Zirconia Plasma Spray Coating

El－Sheikhy, Refat; Kobayashi, Akira

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タイトル	Crack Branching Phenomenon of Zirconia Plasma Spray Coating
著者	El－Sheikhy, Refat El－Sheikhy, Refat
著者	Kobayashi, Akira Kobayashi, Akira
キーワード等	Crack Propagation
	Crack Branching
	Zirconia Coating
	Fracture Spreading
	Delamination
	Global-Local Fracture Criterion
	Linear Elastic Fracture Mechanics
	Elastic-Plastic Deformation
抄録	Gas tunnel plasma spray coating technology has been introduced as one of the recent advances in smart coating technology. Several factors control the quality of the final product of the coating material. Some factors can be summarized as the gas discharge rate, powder size, powder rate, plasma size and temperature, heating time, cooling rate and time, coating time, number of coating layers, relative speed of the sample and plasma spray, etc. These factors have a certain role in addition to the quality in determination of the safe life time of the coating product. Safe life time length and sustainability are actually control the cost and economy of the coating product. Life and history of coating composite will depend on the ability of the composite material to resist failure through fracture, crack propagation, spreading and delamination. The plasma spray coating composite often suffers from cracks and delaminations. Therefore, this research was carried out as a part of our study of zirconia coating to study fracture in early ages of plasma spray coating. Also, this research introduces a method of studying fracture during the life history of the coating composite. This paper discusses a very important problem in fracture mechanics science which is the branching phenomena of the cracks during the process of fracture. This treatment of the branching phenomena of cracks is newly introduced. It depends on the distribution of stresses at the crack tips under remote loading and involves experimental observations in order to have a logical philosophy and understanding for this abnormal natural phenomenon.
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	2
開始ページ	87
終了ページ	94
刊行年月	2007-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/5995
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.2 (2007-12)

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(2) P.87-P.94
DC.title	Crack Branching Phenomenon of Zirconia Plasma Spray Coating
DC.creator	El－Sheikhy, Refat
DC.creator	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	2007-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/5995
DC.subject	Crack Propagation
	Crack Branching
	Zirconia Coating
	Fracture Spreading
	Delamination
	Global-Local Fracture Criterion
	Linear Elastic Fracture Mechanics
	Elastic-Plastic Deformation
DCTERMS.abstract	Gas tunnel plasma spray coating technology has been introduced as one of the recent advances in smart coating technology. Several factors control the quality of the final product of the coating material. Some factors can be summarized as the gas discharge rate, powder size, powder rate, plasma size and temperature, heating time, cooling rate and time, coating time, number of coating layers, relative speed of the sample and plasma spray, etc. These factors have a certain role in addition to the quality in determination of the safe life time of the coating product. Safe life time length and sustainability are actually control the cost and economy of the coating product. Life and history of coating composite will depend on the ability of the composite material to resist failure through fracture, crack propagation, spreading and delamination. The plasma spray coating composite often suffers from cracks and delaminations. Therefore, this research was carried out as a part of our study of zirconia coating to study fracture in early ages of plasma spray coating. Also, this research introduces a method of studying fracture during the life history of the coating composite. This paper discusses a very important problem in fracture mechanics science which is the branching phenomena of the cracks during the process of fracture. This treatment of the branching phenomena of cracks is newly introduced. It depends on the distribution of stresses at the crack tips under remote loading and involves experimental observations in order to have a logical philosophy and understanding for this abnormal natural phenomenon.
citation_title	Crack Branching Phenomenon of Zirconia Plasma Spray Coating
citation_author	El－Sheikhy, Refat
citation_author	Kobayashi, Akira
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2007-12
citation_journal_title	Transactions of JWRI
citation_volume	36
citation_issue	2
citation_firstpage	87
citation_lastpage	94
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/5995
citation_keywords	Crack Propagation
	Crack Branching
	Zirconia Coating
	Fracture Spreading
	Delamination
	Global-Local Fracture Criterion
	Linear Elastic Fracture Mechanics
	Elastic-Plastic Deformation

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