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Modeling of Surface Crack Defects Developed on Shear Edge in High-strength Automotive Steel Sheets
http://hdl.handle.net/10131/00013032
http://hdl.handle.net/10131/00013032faecd4b5-9c34-4041-b911-91a21cb60bbd
名前 / ファイル | ライセンス | アクション |
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ISIJ60Goto.pdf (4.2 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2020-03-09 | |||||
タイトル | ||||||
タイトル | Modeling of Surface Crack Defects Developed on Shear Edge in High-strength Automotive Steel Sheets | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | 780 MPa grade hot-rolled steel, hole punching, cleavage fracture, micro-ductile crack, GTN model | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Goto, Sota
× Goto, Sota× Yamazaki, Kazuhiko× Doan, Thi-Huyen× Funakawa, Yoshimasa× Umezawa, Osamu |
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著者所属 | ||||||
Steel Research Laboratory, JFE Steel Corporation | ||||||
著者所属 | ||||||
Steel Research Laboratory, JFE Steel Corporation | ||||||
著者所属 | ||||||
Steel Research Laboratory, JFE Steel Corporation | ||||||
著者所属 | ||||||
Sheet Business Planning Dept., JFE Steel Corporation | ||||||
著者所属 | ||||||
Faculty of Engineering, Yokohama National University | ||||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Surface crack defects developed on the shear edge cause a problem in shearing of high-strength steels. The surface crack formation mechanism was clarified by microstructural examinations and numerical simulation. Two types of 780 MPa grade hot-rolled steel sheets with a thickness of 2.6 mm were chosen for the evaluations because the materials show different surface crack susceptibilities. Cleavage fracture was responsible for the surface cracks, and micro-ductile cracks with a length of 30 µm to 40 µm were detected in the interrupted punching samples. A numerical simulation demonstrated that a tensile stress was developed in the direction of the micro-ductile cracks opening during punching process. The critical length of the micro-ductile crack for cleavage fracture as a crack initiation site was given by linear fracture mechanics; for example, the critical length is 23 µm or longer under the applied tensile stress of 910 MPa. The tensile stress causing cleavage fracture decreased by reducing the tool clearances, and it was shown experimentally that surface crack defects can be prevented by controlling the clearance appropriately. | |||||
書誌情報 |
ISIJ International 巻 60, 号 1, p. 143-152, 発行日 2020-01-15 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 13475460 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA12106117 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.2355/isijinternational.ISIJINT-2019-326 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
出版者 | ||||||
出版者 | 一般社団法人日本鉄鋼協会 |