An Investigation for Introducing Welding Imperfection in Elastic-plastic Large Deformation Analysis

Park, Do-Hyun; Hirohata, Mikihito; Kim, You-Chul

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タイトル	An Investigation for Introducing Welding Imperfection in Elastic-plastic Large Deformation Analysis
著者	Park, Do-Hyun Park, Do-Hyun
	Hirohata, Mikihito Hirohata, Mikihito
	Kim, You-Chul Kim, You-Chul
著者 (ヨミ)	ヒロハタ, ミキヒト
キーワード等	Welding imperfection
	Elastic-plastic large deformation analysis
	Thermal elastic-plastic analysis
	Welding distortion
	Residual stress
抄録	When the elastic-plastic finite displacement analysis based on the large deformation theory is carried out for evaluating elastic-plastic mechanical behavior and ultimate strength of a welded steel structural member, the welding imperfection is indispensably considered and introduced as the initial imperfection. However, it is known that the introduced welding imperfection could not be reproduced with fidelity by unbalanced force because the welding imperfection is not legitimate. Therefore, it is anticipated that the welding imperfection can be introduced with fidelity if the legitimate welding imperfection is obtained. In order to investigate the validity of the anticipation, the thermal elastic-plastic analysis for a single-pass butt-welding was carried out and welding distortion and residual stress as the legitimate welding imperfection were obtained in this study. The obtained welding imperfection was introduced into the elastic-plastic finite displacement analysis as the legitimate initial imperfection and it was verified whether the introduced welding imperfection could be reproduced with high accuracy or not. As a result, the introduced welding distortion was changed largely from original value because thin steel plate is easy to bend. Consequently, it was considered that the introduction accuracy of the welding imperfection is dependent on the flexural rigidity of steel plate. Anyway, it is known that there are such case as the introduction accuracy of the welding imperfection falls down when the welding imperfection obtained from the thermal elastic-plastic analysis based on the infinitesimal deformation theory is introduced into the elastic-plastic finite displacement analysis based on the large deformation theory.
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	38
号	2
開始ページ	87
終了ページ	93
刊行年月	2009-12
ISSN	03874508
NCID	AA00867058
URL	http://hdl.handle.net/11094/3948
言語	英語
カテゴリ	紀要論文 Departmental Bulletin Paper
カテゴリ	Transactions of JWRI / Vol.38 No.2 (2009-12)

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.38(2) P.87-P.93
DC.title	An Investigation for Introducing Welding Imperfection in Elastic-plastic Large Deformation Analysis
DC.creator	Park, Do-Hyun
	Hirohata, Mikihito
	Kim, You-Chul
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	2009-12
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/3948
DC.subject	Welding imperfection
	Elastic-plastic large deformation analysis
	Thermal elastic-plastic analysis
	Welding distortion
	Residual stress
DCTERMS.abstract	When the elastic-plastic finite displacement analysis based on the large deformation theory is carried out for evaluating elastic-plastic mechanical behavior and ultimate strength of a welded steel structural member, the welding imperfection is indispensably considered and introduced as the initial imperfection. However, it is known that the introduced welding imperfection could not be reproduced with fidelity by unbalanced force because the welding imperfection is not legitimate. Therefore, it is anticipated that the welding imperfection can be introduced with fidelity if the legitimate welding imperfection is obtained. In order to investigate the validity of the anticipation, the thermal elastic-plastic analysis for a single-pass butt-welding was carried out and welding distortion and residual stress as the legitimate welding imperfection were obtained in this study. The obtained welding imperfection was introduced into the elastic-plastic finite displacement analysis as the legitimate initial imperfection and it was verified whether the introduced welding imperfection could be reproduced with high accuracy or not. As a result, the introduced welding distortion was changed largely from original value because thin steel plate is easy to bend. Consequently, it was considered that the introduction accuracy of the welding imperfection is dependent on the flexural rigidity of steel plate. Anyway, it is known that there are such case as the introduction accuracy of the welding imperfection falls down when the welding imperfection obtained from the thermal elastic-plastic analysis based on the infinitesimal deformation theory is introduced into the elastic-plastic finite displacement analysis based on the large deformation theory.
citation_title	An Investigation for Introducing Welding Imperfection in Elastic-plastic Large Deformation Analysis
citation_author	Park, Do-Hyun
	Hirohata, Mikihito
	Kim, You-Chul
citation_publisher	大阪大学接合科学研究所
citation_language	英語
citation_date	2009-12
citation_journal_title	Transactions of JWRI
citation_volume	38
citation_issue	2
citation_firstpage	87
citation_lastpage	93
citation_issn	03874508
citation_public_url	http://hdl.handle.net/11094/3948
citation_keywords	Welding imperfection
	Elastic-plastic large deformation analysis
	Thermal elastic-plastic analysis
	Welding distortion
	Residual stress

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