{"created":"2023-06-20T15:08:48.409183+00:00","id":4638,"links":{},"metadata":{"_buckets":{"deposit":"75baa5cf-d9a8-499a-8b71-ac6486865c3d"},"_deposit":{"created_by":17,"id":"4638","owners":[17],"pid":{"revision_id":0,"type":"depid","value":"4638"},"status":"published"},"_oai":{"id":"oai:ynu.repo.nii.ac.jp:00004638","sets":["495:498"]},"author_link":["21700","21701","21699"],"item_7_alternative_title_21":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"A study on visco-plastic behavior and stretch fabrication of tensile membrane structures using ETFE Film"}]},"item_7_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2013-06-30","bibliographicIssueDateType":"Issued"}}]},"item_7_date_granted_66":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2013-06-30"}]},"item_7_degree_grantor_64":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"横浜国立大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12701","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_7_degree_name_63":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士(工学)"}]},"item_7_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本論文は、ETFE(エチレンーテトラフルオロエチレン共重合体の略語)フィルムを用いた張力膜構造の粘製性挙動と延伸成形に関する研究についてまとめたものである。本研究では、テンション方式フィルム膜構造を対象として、フィルム膜構造の耐カを高める方法として、フィルムを塑性域まで延伸することを提案し、張カ膜構造における延伸成形の有効性について実験及び解析的検討を通じて明らかにしている。本研究論文は、以下のように第1章から第6章までの合計6つの章で構成している。第1章の「序論」では、本研究を行うに至った背景とその目的を明確にし、さらに本論文の構成についてまとめている。第2章の「ETFEフィルムの粘塑性構成式」では、フィルムの粘塑性挙動を把握するために、粘塑性構成式を適用し、その妥当性を確認している。まず、フィルムのひずみ速度依存性が再現できるように粘塑性構成式内の材料定数をひずみ速度に応じた近似式で表し、フィルムの1軸及び2軸引張時における解析と実験結果の比較検討を行っている。また、フィルムの第1降伏点を超えた後のひずみ軟化現象を解明するために、アニーリング処理を施したフィルムの1軸引張実験を行い、フィルムの構造挙動について検討している。さらに、粘塑性構成式によるフィルムのカーブフィッティングを行うことで、フィルムへの適用可能性を確認している。第3章の「ETFEフィルムの延伸効果」では、フィルム膜構造の耐力を高めるための方法として、パネル取付け時にフィルムを塑性域まで延伸することを提案し、その有効性を検討している。まず、延伸成形実験を通じて張力膜構造への適用可能性及びフィルム膜構造の高耐力化が可能なことを確認している。また、実験を模擬した解析的検討を行い、粘性挙動を考慮した弾塑性解析の有効性を検討している。なお、実験施設に対して経年後の張力測定を行い、張力膜構造におけるリラクセーションによる粘塑性挙動について検討を行っている。第4章の「ETFEフィルムの応力集中」では、テンション方式フィルム膜構造における外周引込みによるフィルムの応カ集中問題について検討している。まず、フィルムを対象として引張実験を行い、切欠き形状による応力集中と亀裂発生との関係を検討している。さらに、実験モデルを対象として1軸引張実験を模擬したFEM解析を行い、クラックやノッチ先端部における応力集中や亀裂発生時の応力分布について把握している。第5章の「ETFEフィルムを用いた立体形状の延伸成形」では、テンション方式フィルム膜構造の技術的確立を目的として、様々な形状のモデルを対象として延伸成形の適用可能性を確認し、実証実験を通じて実際構造物への実現可能性を把握している。まず、スタディーモデルの試作を通じて、色々な形状のテンション方式に対する延伸成形の適用可能性を確認している。また、実証実験を通じてアーチを用いた延伸成形方法の有効性及び延伸成形後のフィルムの粘性挙動について検討している。さらに、粘性挙動を考慮した弾塑性解析を行い、実験結果との比較検討を通じて解析結果の妥当性を検討するとともに、延伸成形後のフィルムの力学的挙動についても検討を行っている。第6章の「結論」は、各章で得られた結果と研究成果についてまとめている。","subitem_description_type":"Abstract"},{"subitem_description":"This thesis is a summary of study on the visco-p1astic behavior and stretch-fabrication oftensi1e membrane structures using ETFE (Ethylene/TetraFluoroEthylene) film. In This study, a method of stretching the ETFE film to its plastic region is proposed in order to increase the yield strength of film membrane structures on tension type. And the effectiveness of stretch-fabrication on such structures is demonstrated by means of experimental and ana1ytical investigations. This thesis comprises six chapters，as described below. Chapter 1, “Introduction”, describes the background and purpose of this study, and summarizes the structure of the overall thesis. Chapter 2, “Visco-plastic Constitutive Equation for ETFE Film”, describes the use of the visco-plastic constitutive equation to clarify the Visco-plastic behavior of the film, and confirms the validity of this approach. First, the material constants are approximated in the visco-plastic constitutive equation based on the strain rate，so that the strain rate dependence of the film could be reproduced. Then, an analysis on uniaxial and biaxial tensile behavior of the film is performed and its results are compared to those of experiments. Also, the uniaxiall tensile test on an annealed film is conducted in order to clarify the strain softening phenomenon after the first yield point has been exceeded, and the structural behavior of the film is investigated. Additionally, to verify the possibility of application to the film, the curve fitting of the film is carried out by using the visco-plastic constitutive equation.  Chapter 3, “Stretching Effect of ETFE Film”, proposes stretching the film to its plastic region during panel installation as a method of increasing the yield strength of the film membrane structure，and confirms the effectiveness of this approach. First，to investigate the possibility of application on tensile membrane structures, a stretch-fabrication test is carried out, and it is verified that it is possible to increase the yield strength of the film membrane structures. An analytic investigation is also carried out by simulating the experiment, and the effectiveness of the elasto-plastic analysis considering the viscous behavior of the film is investigated. In addition，post-aging tension measurement is conducted at the experimental facilities, and the visco-plastic behavior resulting from relaxation is investigated with respect to tensile membrane structures.  Chapter 4, “Stress Concentration in ETFE Film”, describes the stress concentration of ETFE film caused by stretching the boundary in tensile film membrane structures. First，the uniaxial tensile test is conducted by a shape and a size of notch on the film, and the relationship between the stress concentration and crack propagation is examined by changing a shape of notch. Additionally, FEM analysis on the experimental model is carried out, in order to identify the stress concentration and the stress distribution at cracks and notch tips when crack tip yielding is occurred.  Chapter 5, “Stretch-fabrication of Three-Dimensional Shapes Using ETFE Film”, confirms the possibility of applying stretch-fabrication on models with various shapes to allow technological establishment of such tensile film membrane structures，and shows through validation tests that this approach can be applied to actual structures. First, the applicability of stretch-fabrication is confirrned by introducing tension for study models with various shapes. Also, through validation tests，the effectiveness of the stretch-fabrication method using an arch and the viscous behavior of the film after stretch-fabrication is investigated. Additionally, the elasto-plastic analysis is carried out by considering the viscous behavior of film, and the validity of the analysis results is examined by comparing to experimental results. After stretch-fabrication, the mechanical behavior of the film is also investigated.  Chapter6, “Conclusion”, summarizes results obtained by experiments and analysis described in each chapter，together with outcomes of this study.","subitem_description_type":"Abstract"}]},"item_7_dissertation_number_67":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第1563号"}]},"item_7_full_name_2":{"attribute_name":"著者(ヨミ)","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"21700","nameIdentifierScheme":"WEKO"}],"names":[{"name":"ゾン, ウルソク"}]}]},"item_7_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"21701","nameIdentifierScheme":"WEKO"}],"names":[{"name":"Jeong, Eul-Seok"}]}]},"item_7_subject_24":{"attribute_name":"国立国会図書館分類","attribute_value_mlt":[{"subitem_subject":"UT51","subitem_subject_scheme":"NDLC"}]},"item_7_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"国立大学法人 横浜国立大学大学院 工学府"}]},"item_7_version_type_18":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"丁, 乙碩"}],"nameIdentifiers":[{"nameIdentifier":"21699","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":"2016-09-16"}],"displaytype":"detail","filename":"jeong_eul_seok-thesis.pdf","filesize":[{"value":"19.3 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"jeong_eul_seok-thesis.pdf","objectType":"fulltext","url":"https://ynu.repo.nii.ac.jp/record/4638/files/jeong_eul_seok-thesis.pdf"},"version_id":"cbba1a56-f6b4-4ab3-99a7-c5b86d0a613c"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-09-16"}],"displaytype":"detail","filename":"jeong_eul_seok-review.pdf","filesize":[{"value":"87.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"jeong_eul_seok-review.pdf","url":"https://ynu.repo.nii.ac.jp/record/4638/files/jeong_eul_seok-review.pdf"},"version_id":"b17243d0-817e-4234-b7c3-8012ad191aee"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"ETFEフィルムを用いた張力膜構造の粘塑性挙動と延伸成形に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"ETFEフィルムを用いた張力膜構造の粘塑性挙動と延伸成形に関する研究","subitem_title_language":"ja"}]},"item_type_id":"7","owner":"17","path":["498"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2014-01-23"},"publish_date":"2014-01-23","publish_status":"0","recid":"4638","relation_version_is_last":true,"title":["ETFEフィルムを用いた張力膜構造の粘塑性挙動と延伸成形に関する研究"],"weko_creator_id":"17","weko_shared_id":-1},"updated":"2023-08-25T01:51:53.675288+00:00"}