{"created":"2022-01-27T08:17:47.760803+00:00","id":2004852,"links":{},"metadata":{"_buckets":{"deposit":"8f24bf87-e4af-48c6-9517-9474ccb7fe35"},"_deposit":{"id":"2004852","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2004852"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02004852","sets":["1642838403123","1642838403551:1642838406845"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"疲労き裂伝ぱ抑制機能を持つ部材の開発について","subitem_1551255648112":"ja"},{"subitem_1551255647225":"An improvement in the resistance ability of fatigue crack propagation in a metal","subitem_1551255648112":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"真壁, 朝敏","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"Makabe, Chobin","creatorNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_1522299639480":"open access","subitem_1600958577026":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"疲労"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"残留応力"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"加工法"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"応力変動"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"き裂伝ぱ"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"き裂閉口"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"性質変化"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"遅延"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Cross-section shape"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"き裂伝ぱの遅延"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Metal"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Machining method"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"応力拡大係数"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Fatigue"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"き裂伝ぱ速度"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"き裂開口"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"部材断面"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Local-heated material"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Residual stress"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Crack closure"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"き裂伝ぱ則"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Crack propagation"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"科研費番号: 07650109","subitem_description_type":"Other"},{"subitem_description":"平成7年度～平成8年度科学研究費補助金（基盤研究（C)(2))研究成果報告書","subitem_description_type":"Other"},{"subitem_description":"研究概要：疲労き裂の伝ぱによってこれまでに多くの破壊事故が生じている。従って、疲労破壊事故を未然に防ぐには,き裂の発生を検出することが重要である。また,それと同時に発生したき裂の進展を遅らせることや阻止することも重要であると思われる。本研究では,部材の加工形状,複合化等によって,き裂の進展を遅らせる(抑制する)ことができるかどうかについて検討した。まず,き裂が進展する方向に溝を設けた試験片を用いて板厚の急変によってき裂伝ぱ速度が抑制できるかどうかについて検討した。その結果,き裂伝ぱ速度は溝の前で加速し,溝を通過した後に減速することがわかった。しかし,平均的なき裂伝ぱ速度は溝の配列や深さによって異なった。1つの溝を加工した試験片では,溝のない試験片の場合を基準にした場合,溝の深さを板厚の6割以上にした場合に基準より寿命が長くなった。このことから,板厚を急に変化させた場合にはき裂伝ぱが抑制できる場合があることが期待できることがわかった。そして,この理由としては,き裂先端に過大な応力が単発的に加わり,圧縮の残留応力が生じたことが考えられた。また,密接して溝を加工した場合は溝の深さにかかわらず,き裂伝ぱ寿命は基準の場合より長くなることはなかった。この場合には溝による応力集中の干渉とき裂先端に複雑な変動応力が加わるため,き裂伝ぱが加速することが考えられた。き裂のある板とない板を貼合わせた場合には,最終的に試験片が分断するのを防ぐ効果はあったが,き裂伝ぱそのものは1枚の板の場合と大差がなかった。また,局所的に試験片の硬さや組織を変化させた場合には,き裂伝ぱ方向にその変化した部分がある場合にき裂伝ぱ速度が抑制されることがわかった。以上のことから部材の加工法等に工夫をすることによってき裂伝ぱ速度が抑制できる可能性があることがわかった。","subitem_description_type":"Other"},{"subitem_description":"研究概要：If we can detect the crack initiation and control the crack propagation, the fracture accident owing to the metal fatigue can be reduced. Therefore, an improvement in the resistance ability of fatigue crack propagation in a metal was studied. For this purpose, the materials were machined and heat-treated by some method. One of these specimen has a groove which is cut in the loading direction. In this specimen the fatigue crack propagation was investigated when the material has a cross-section of complicated shape. The nondimensional depth of groove to the specimen thickness b/t was chosen three values, that is, b/t=0.125,0.45,0.65. The delay of crack propagation was observed in the case of b/t=0.65. Therefore, the resistance ability of fatigue crack propagation of a material can be improved, if the material was machined in a special shape. The crack propagation behavior of a local-heated specimen was investigated. This specimen was used for the substitution of a composite material. When the local-heated zone was located in front of the crack tip, the crack propagation rate was decelerated. From those results, it is found that a material can be improved in the resistance of the fatigue crack propagation, if the material is machined or heat-treated by a special technique. Also, it is expected that composite material can be designed for the purpose that the fatigue crack propagation rate is decelerated.","subitem_description_type":"Other"},{"subitem_description":"未公開：P.26以降（別刷論文のため）","subitem_description_type":"Other"},{"subitem_description":"研究報告書","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"ja","subitem_1522300316516":"真壁朝敏"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_1551255818386":"jpn"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/12227"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_1522646500366":"NCID","subitem_1522646572813":"BA35481168"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1997-03","bibliographicIssueDateType":"Issued"}}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_1522305645492":"VoR","subitem_1600292170262":"http://purl.org/coar/version/c_970fb48d4fbd8a85"}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","filename":"07650109.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2004852/files/07650109.pdf"},"version_id":"0cc21e41-4aa1-403c-8618-f2338ae46891"}]},"item_title":"疲労き裂伝ぱ抑制機能を持つ部材の開発について","item_type_id":"15","owner":"1","path":["1642838403123","1642838406845"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2009-09-01"},"publish_date":"2009-09-01","publish_status":"0","recid":"2004852","relation_version_is_last":true,"title":["疲労き裂伝ぱ抑制機能を持つ部材の開発について"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-10-31T02:24:19.050523+00:00"}