{"created":"2021-03-01T06:43:20.398267+00:00","id":25385,"links":{},"metadata":{"_buckets":{"deposit":"5897f7e9-20e3-4592-83b4-6ef4bcfd3246"},"_deposit":{"id":"25385","owners":[],"pid":{"revision_id":0,"type":"depid","value":"25385"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00025385","sets":["27:2466:2467:2539","9:504:2469:2540"]},"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"ねじり試験で得られた木材のせん断強度"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1999","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"252","bibliographicPageStart":"247","bibliographicVolumeNumber":"101","bibliographic_titles":[{"bibliographic_title":"東京大学農学部演習林報告"}]}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"塑性変形を考慮し，矩形棒のねじり試験から，木材のせん断強度を求めた。試験にはシトカスプルース（Picea sitchensis Carr.），アガチス（Agathis sp.），カツラ（Cercidiphyllum japonicum Sieb. and Zucc.）およびブナ（Fagus crenata Bl.）を用いた。これらの試験体を，繊維方向を中心軸としてねじり，まさ目面および板目面のせん断応力－せん断ひずみ関係を得た。このせん断応力－せん断ひずみ関係をべき乗関数を用いて定式化し，破壊発生時のひずみの値をこの式に代入することでせん断強度を求めた。一方，ねじり負荷では破壊まで弾性状態を保つという従来より行われている方法でねじりせん断強度を求め，それぞれの値を比較した。その結果，樹種によってせん断応力－せん断ひずみ関係は多様であったが，いずれの樹種においても定式化によって得られた真のせん断強度の値は従来の方法で得られた強度の約70％程度となった。","subitem_description_type":"Abstract"},{"subitem_description":"In this paper, we tried to obtain the real shear strength of wood by torsion tests with considering the plastic deformation. Sitka spruce (Picea sitchensis Carr.), agathis (Agathis sp.), katsura (Cercidiphyllum japonicum Sieb. and Zucc.) and buna (Japanere beech, Fagus crenata Bl.) were used for the specimens. These specimens were twisted around the longitudinal axis, and the shear stress-shear strain relationships of LR- (longitudinal-radial) planes and LT- (longitudinal-tangential) planes were obtained. These relationships were formulated by n-power functions, and the shear strengths were predicted by putting the shear strain at the occurrence of failure on the formula. On the other hand, the shear strength was independently calculated by the conventional method which is based on the hypothesis that the specimen keeps its elastic stress condition under the torsional loading, and the strengths obtained by the different methods were compared with each other. Although the shear stress-shear strain relationships varied by the species, the values of elastic-plastic strengths were about 70% of those obtained by the conventional method. There are several results of mechanical tests which show the coincidence between the testing data and theoretical analyses more precisely when the shear strength is evaluated as about 70% of that obtained by the conventional solution.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"54413","nameIdentifierScheme":"WEKO"}],"names":[{"name":"吉原, 浩"}]},{"nameIdentifiers":[{"nameIdentifier":"54414","nameIdentifierScheme":"WEKO"}],"names":[{"name":"太田, 正光"}]}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学大学院農学生命科学研究科附属演習林"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162451","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"03716007","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"610","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"The Tokyo University Forests"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"Faculty of Science and Engineering, Shimane University"},{"subitem_text_value":"Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo"},{"subitem_text_value":"島根大学総合理工学部材料プロセス工学科"},{"subitem_text_value":"東京大学大学院農学生命科学研究科"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"YOSHIHARA, Hiroshi"}],"nameIdentifiers":[{"nameIdentifier":"54411","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"OHTA, Masamitsu"}],"nameIdentifiers":[{"nameIdentifier":"54412","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-06-09"}],"displaytype":"detail","filename":"esrh101007.pdf","filesize":[{"value":"379.8 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"esrh101007.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/25385/files/esrh101007.pdf"},"version_id":"f85a73d9-d7f0-4701-99b8-4aa49400ad72"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"せん断強度","subitem_subject_scheme":"Other"},{"subitem_subject":"ねじり試験","subitem_subject_scheme":"Other"},{"subitem_subject":"定式化","subitem_subject_scheme":"Other"},{"subitem_subject":"Shear strength","subitem_subject_scheme":"Other"},{"subitem_subject":"Torsion test","subitem_subject_scheme":"Other"},{"subitem_subject":"Formulation","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Shear Strength of Wood Obtained by Torsion Test","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Shear Strength of Wood Obtained by Torsion Test"}]},"item_type_id":"4","owner":"1","path":["2540","2539"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-09-03"},"publish_date":"2014-09-03","publish_status":"0","recid":"25385","relation_version_is_last":true,"title":["Shear Strength of Wood Obtained by Torsion Test"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-19T04:00:56.091543+00:00"}