{"created":"2023-06-19T09:12:25.369780+00:00","id":24239,"links":{},"metadata":{"_buckets":{"deposit":"291b2328-0050-44e9-984d-9146169464b8"},"_deposit":{"created_by":1,"id":"24239","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"24239"},"status":"published"},"_oai":{"id":"oai:kumadai.repo.nii.ac.jp:00024239","sets":["343:347:350:353"]},"author_link":["107363","107365","107364"],"item_14_alternative_title_22":{"attribute_name":"その他の言語のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Development of a plain bending type fatigue testing machine for thin sheet specimen and analysis of fatigue fracture behavior in hcp metals"}]},"item_14_alternative_title_23":{"attribute_name":"タイトル（ヨミ）","attribute_value_mlt":[{"subitem_alternative_title":"ハクヘン マゲ コガタ ヒロウ シケン キ ノ カイハツ ト ソレ オ モチイタ hcp キンゾク ノ ヒロウ ハカイ キョドウ ノ 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金属の単結晶を用いて疲労破壊挙動の結晶方位依存性を調査した研究は、応力比R=0.1のき裂進展機構のみである。そこで本論文では、hcp 金属の中でも、実用構造材料として重要なマグネシウムとチタンについて、結晶方位の異なる単結晶を用いて、R=-1における疲労寿命や疲労強度に及ぼす結晶方位の影響や、結晶方位毎の疲労破壊機構を明らかにすることを目的とした。さらに、集合組織を有すると考えられるマグネシウム合金として、AZ31B押出し材とMg-Zn-Y系合金の押出し材の疲労破壊試験を行い、単結晶の結果を基に、多結晶の疲労破壊機構を明らかにすることを目的とした。ここで、単結晶を用いて疲労試験を行う場合、既存の試験法で用いられる大きさの試験片を準備することは困難である。さらに、単結晶は変形し易く、機械加工により損傷が入り易い。そこで、小寸法で単純な形状の試験片を用いて、その疲労破壊挙動の調査が可能である疲労試験機の開発を行った。","subitem_description_type":"Other"}]},"item_14_publisher_36":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"熊本大学"}]},"item_14_subject_20":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"377.5","subitem_subject_scheme":"NDC"}]},"item_14_text_18":{"attribute_name":"形態","attribute_value_mlt":[{"subitem_text_value":"9273983 bytes"}]},"item_14_text_47":{"attribute_name":"資源タイプ・ローカル","attribute_value_mlt":[{"subitem_text_value":"博士論文"}]},"item_14_text_48":{"attribute_name":"資源タイプ・NII","attribute_value_mlt":[{"subitem_text_value":"Thesis or 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