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YUYA OMIYA

  • Faculty of Engineering and Design
  • Department of Engineering and Design
  • Associate Professor
Last Updated :2026/06/24

Researcher Information

Degree

  • Ph.D.（2013/03 Hiroshima University）

Research funding number

  • 40717203

ORCID ID

J-Global ID

Research Interests

  • 機械要素   トライボロジー   材料力学   機械設計   

Research Areas

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Design engineering
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Machine elements and tribology
  • Nanotechnology/Materials / Composite materials and interfaces

Academic & Professional Experience

  • 2023/04 - Today  Kagawa UniversityFaculty of Engineering and Design准教授
  • 2021/04 - 2023/03  Okayama University学術研究院 自然科学学域助教
  • 2014/04 - 2021/03  Okayama UniversityThe Graduate School of Natural Science and Technology助教
  • 2013/04 - 2014/03  Hiroshima UniversityGraduate School of Engineering特任助教

Education

  • 2010/04 - 2013/03  Hiroshima University  Graduate School of Engineering  機械システム工学専攻 博士課程後期
  • 2008/04 - 2010/03  Hiroshima University  Graduate School of Engineering  機械システム工学専攻 博士課程前期

Association Memberships

  • 日本ねじ研究協会   日本設計工学会   日本トライボロジー学会   日本接着学会   米国機械学会   日本機械学会   

Published Papers

Books etc

  • 国際会議論文抄録集 ASME 2019 International Design Engineering Technical Conferences & International Conference on Gears 2019
    大宮祐也 (Joint work)RC283 歯車装置の設計・製造・評価に関わる革新技術のための試験・調査研究分科会 2020/04
  • Analysis and Design for Bolted Joints
    (Joint work)The Japan Research Institute for Screw Threads and Fasteners 2016/05

Conference Activities & Talks

  • Influence of Chamfering at Bolt Hole and Head Styles on Spring Constants of Bolted Joint  [Not invited]
    Yuya Omiya; Yu Sumikawa; Tadashi Shiota; Masahiro Fujii
    The 9th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2023)  2023/03  Ramada Plaza Hotel, Jeju island  The Korean Society of Mechanical Engineers, The Japan Society of Mechanical Engineers
  • Tribological Properties of Polysiloxane-containing Polyimide Coatings under Water Lubrication  [Not invited]
    Fan Yuelin; Shiota Tadashi; Omiya Yuya; Fujii Masahiro
    The 9th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2023)  2023/03  Ramada Plaza Hotel, Jeju island  The Korean Society of Mechanical Engineers, The Japan Society of Mechanical Engineers
  • Friction and Wear Properties of Amorphous SiC-based Coatings in Water  [Not invited]
    Tadashi Shiota; Ryosuke Ishii; Yuya Omiya; Masahiro Fujii
    The 9th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2023)  2023/03  Ramada Plaza Hotel, Jeju island  The Korean Society of Mechanical Engineers, The Japan Society of Mechanical Engineers
  • PTFEコーティングの耐摩耗性に及ぼす木材由来酸化ナノカーボン添加の影響  [Not invited]
    丸岡寛武; 大宮祐也; 塩田忠; 藤井正浩
    日本機械学会 中国四国支部 第61期総会・講演会  2023/03  オンライン開催（ホスト：近畿大学工学部）  （一社）日本機械学会 中国四国支部
  • リン酸アルミニウム含浸炭素材料の乾燥摩擦摩耗特性  [Not invited]
    石本惇; 塩田忠; 大宮祐也; 藤井正浩
    日本機械学会 中国四国支部 第61期総会・講演会  2023/03  オンライン開催（ホスト：近畿大学工学部）  （一社）日本機械学会 中国四国支部
  • 遷移金属ホウ化物薄膜コーティングの乾燥摩擦摩耗特性  [Not invited]
    浅原優輝; 塩田忠; 大宮祐也; 藤井 正浩
    日本機械学会 中国四国支部 第61期総会・講演会  2023/03  オンライン開催（ホスト：近畿大学工学部）  （一社）日本機械学会 中国四国支部
  • 酸化物薄膜コーティングによる生体用合金のフレッチング摩耗の低減  [Not invited]
    永栄謙登; 塩田忠; 大宮祐也; 藤井正浩
    日本機械学会 中国四国学生会 第53回学生員卒業研究発表講演会  2023/03  オンライン開催（ホスト：近畿大学工学部）  日本機械学会中国四国学生会
  • 炭素添加炭化ケイ素コーティングの水中摩擦摩耗特性  [Not invited]
    石井良助; 大宮祐也; 塩田忠; 藤井正浩
    日本機械学会 第21回機素潤滑設計部門講演会（MDT2022）  2022/12  オンライン講演会  （一社）日本機械学会
  • 接触面表面粗さを考慮したねじ締結体締付け特性の推定手法  [Not invited]
    両角由貴夫; 小松優太; 大宮祐也; 塩田忠; 藤井正浩
    日本機械学会 2022年度 年次大会  2022/09  富山大学 五福キャンパス  （一社）日本機械学会
  • 第一原理計算によるSi系およびTi系薄膜のAl 2O3基板に対する密着性の評価  [Not invited]
    嶋崎一真; 竹中優加; 塩田忠; 大宮祐也; 藤井正浩
    日本設計工学会中国支部研究発表後援会  2022/06  広島工業大学広島校舎  (公社)日本設計工学会中国支部
  • シロキサン含有ポリイミドコーティングの水潤滑特性に及ぼす硬化温度の影響  [Not invited]
    范月林; 塩田忠; 大宮祐也; 藤井正浩
    日本設計工学会中国支部研究発表講演会  2022/06  広島工業大学広島校舎  (公社)日本設計工学会中国支部
  • 線膨張係数差に起因するボルト軸力変動について  [Not invited]
    渡邉 忠俊; 大宮 祐也
    第3回ねじ研究シンポジウム  2021/11
  • 金属平型ガスケット表面の微細観察に基づく微小漏えいメカニズムの考察  [Not invited]
    林大雅; 大宮祐也; 塩田忠; 藤井正浩
    日本トライボロジー学会トライボロジー会議2021 秋 松江  2021/10
  • 炭化ケイ素コーティングによる生理食塩水中の摩擦特性の向上  [Not invited]
    塩田忠; 谷家大樹; 竹中優加; 石井良助; 大宮祐也; 藤井正浩
    日本トライボロジー学会トライボロジー会議2021 秋 松江  2021/10
  • 粘弾性材料の摩擦特性に及ぼすディンプルの影響  [Not invited]
    中村 浩大; 藤井 正浩; 大宮 祐也; 石井 清剛
    日本機械学会 2021年度年次大会  2021/09
  • はめ合い状態がねじ込みボルト締結体のばね定数に及ぼす影響  [Not invited]
    大宮 祐也; 塩田 忠; 藤井 正浩
    日本機械学会 2021年度年次大会  2021/09
  • 原子層堆積法によるアルミナ薄膜コーティングがステンレス製ねじの摩擦特性に及ぼす影響  [Not invited]
    山内 恒輝; 大宮 祐也; 両角 由貴夫; 塩田 忠; 藤井 正浩
    日本機械学会 2021年度年次大会  2021/09
  • Friction and wear behavior of Si-based organic-inorganic hybrid films in water  [Not invited]
    塩田忠; 山本剛史; 塩見公; 大宮祐也; 藤井正浩
    日本トライボロジー学会トライボロジー会議2021 春 東京  2021/05
  • レーザピーニングで施したディンプルが摩擦特性に及ぼす影響  [Not invited]
    河渕紗英子; 藤井正浩; 塩田忠; 大宮祐也
    日本機械学会 中国四国支部 第59期総会・講演会  2021/03
  • ステンレ鋼基板上に製膜されたシリカコーティング膜の水中トライボロジー特性  [Not invited]
    塩見公; 塩田忠; 大宮祐也; 藤井正浩
    日本機械学会 中国四国支部 第59期総会・講演会  2021/03
  • 各種ホウ化物硬質コーティング膜の乾燥摩擦摩耗特性  [Not invited]
    梁瑞和; 塩田忠; 大宮祐也; 藤井正浩
    日本機械学会 中国四国支部 第59期総会・講演会  2021/03
  • 回転角締め付け挙動に及ぼす表面粗さの影響  [Not invited]
    玄馬之善; 大竹遼平; 両角由貴夫; 大宮祐也; 塩田忠; 藤井正浩
    日本機械学会 中国四国支部 第59期総会・講演会  2021/03
  • 木材由来ナノカーボン材料のゴムへの応用とその機械特性  [Not invited]
    彭履安; 大宮祐也; 塩田忠; 藤井正浩
    日本機械学会 中国四国支部 第59期総会・講演会  2021/03
  • Si系有機無機ハイブリットコーティングの水潤滑特性  [Not invited]
    山本剛史; 塩田忠; 大宮祐也; 藤井正浩
    日本機械学会 中国四国学生会 第51回学生員卒業研究発表講演会  2021/03
  • Fast time-resolved measurement during fracture of alumina ceramics
    塩田忠; IM Mingyun; 大宮祐也; 藤井正浩
    日本セラミックス協会年会講演予稿集(Web)  2021
  • 生理食塩水中における炭化ケイ素コーティングの摩擦摩耗特性  [Not invited]
    塩田忠; 谷家大樹; 竹中優加; 大宮祐也; 生駒俊之; 藤井正浩
    MRM Forum 2020  2020
  • Strength Characterization of Adhesive Joint Surface-Modified by Large-Area Eb Irradiation  [Not invited]
    Yuya Omiya; Kenji Toyota; Ryota Nakanishi; Akira Okada; Togo Shinonaga; Masahiro Fujii
    The International Conference on Leading Edge Manufacturing/Materials and Processing  2020/09
  • 水潤滑下におけるステンレス基材上の酸化物コーティング膜のトライボロジー特性  [Not invited]
    塩見公; 塩田忠; 大宮祐也; 藤井正浩
    日本設計工学会 中国支部 研究発表講演会  2020/06
  • レーザピーニングが浸炭硬化鋼の転動疲労寿命に及ぼす影響  [Not invited]
    影山大恩; 河渕紗英子; 塩田 忠; 大宮祐也; 藤井正浩
    日本機械学会 中国四国支部 第58期総会・講演会  2020/03
  • ねじ締結速度がグリース潤滑されたねじ面の損傷に及ぼす影響  [Not invited]
    川口隼己; 大宮祐也; 塩田 忠; 藤井正浩
    日本機械学会 中国四国支部 第58期総会・講演会  2020/03
  • 炭化ケイ素の水潤滑しゅう動における低摩擦状態の発現に及ぼす摩擦帯電の影響  [Not invited]
    肖 佳?; 塩田 忠; 大宮祐也; 藤井正浩
    日本機械学会 中国支部第58期総会・講演会  2020/03
  • ボルト軸力にばらつきを有する管フランジ締結体の漏えい特性  [Not invited]
    朱 万玉; 大宮祐也; 塩田 忠; 藤井正浩
    日本機械学会 中国支部第58期総会・講演会  2020/03
  • 表面テクスチャリングが接着継手強度に与える影響  [Not invited]
    豊田健二; 大宮祐也; 中西亮太; 塩田 忠; 藤井正浩
    日本機械学会 中国支部第58期総会・講演会  2020/03
  • Mechanical Properties of Amorphous SiC thin films on Al2O3 Ceramic Substrates  [Not invited]
    T. Shiota; D. Taniya; M. Okiyama; Y. Takenaka; Y. Omiya; T. Ikoma; M. Fujii
    The 13th Pacific Rim Conference of Ceramic Societies
  • Influence of Tightening Speed on Rapture of Screw Threads  [Not invited]
    Yuya Omiya; Hayaki Kawaguchi; Tadashi Shiota; Masahiro Fujii
    The 8th International Conference on Manufacturing, Machine Design and Tribology (ICMDT 2019)  2019/04
  • Tribological behavior of silicon carbide coating films for ceramic-on-ceramic artificial joints  [Not invited]
    T. Shiota; M. Akiyama; D. Taniya; Y. Omiya; T. Ikoma; M. Fujii
    The 8th International Conference on Manufacturing, Machine Design and Tribology (ICMDT 2019)  2019/04
  • LEAK BEHAVIOR AND PREDICTION OF METAL RING JOINT GASKETS IN SIMPLIFIED LEAK TEST WITH GROOVED PLATEN
    Yuya Omiya; Masahiro Fujii
    PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2019, VOL 2  2019  AMER SOC MECHANICAL ENGINEERS
  • Reinforcement of SBR by Oxidized Nano Carbon Derived from Wood Powder
    Kawamoto Hiroki; Omiya Yuya; Fujii Masahiro
    The Proceedings of Conference of Chugoku-Shikoku Branch  2019  The Japan Society of Mechanical Engineers
  • A Study on Strength Reliability of Adhesive Joints by Texturing and Surface Modification
    TOYOTA Kenji; OMIYA Yuya; SHINONAGA Togo; OKADA Akira; FUJII Masahiro
    The Proceedings of the Materials and Mechanics Conference  2019  The Japan Society of Mechanical Engineers
     
    In recent years, adhesive joint has been used in a mechanical field due to developing of adhesives, however the bonding strength and the reliability of the bonding strength is weaker than mechanical fastening. In this study, the tensile strength of single lap joint was measured in order to investigate the influence of various surface texturing and a surface treatment. Specimens consist of aluminum alloy plates (A6061). Nd: YAG laser and Vickers indenter were used to process the difference texturing shape. Also large-area electron beam (EB) was used for surface treatment. Each one of specimens were examined from the view of wettability and anchor effect. Compared with Non-treated, other joints were confirmed to improve the tensile strength, especially the joint that was irradiated Nd: YAG laser and large-area EB was the largest strength and improved about 75%. Under the condition of EB irradiation, the tensile strength was increased due to improved adhesive strength of interface. In addition, the anchor effect of adhesive surface was sufficiently developed by improving adhesive strength. Therefore, it is considered that the condition with applying texturing and the EB irradiation was improved the tensile strength of adhesive surface most.
  • Analyses on Mechanical Behaviour of the Bolted Joints in case of the tightening by 3D FEM
    MOROZUMI Yukio; GENBA Nobuyoshi; OMIYA Yuya; FUJII Masahiro
    The Proceedings of the Materials and Mechanics Conference  2019  The Japan Society of Mechanical Engineers
     
    In design of bolted joints, it is important to understand bolt axial tensions to avoid joint loosening. In recent years, FEM models with three dimensional threads have been applied to analyze mechanical characteristics of bolted joints. In this paper, tightening experiments, elastic FEM analyses and simplified calculations were conducted for bolted joints which consist of two hollow discs tightened by a hexagonal bolt with flange and a hexagonal nut with flange in order to obtain relationships among rotation angle θ [°], bolt axial tension F [kN] and tightening torque T [Nm]. As the results, it was shown that the relationships between the rotation angle θ [°] and bolt axial tension F [kN] obtained by FEM analyses with three dimensional thread have good agreement with the experimental results in a range of an initial tightening, which has non-linear relationship between the rotation angle θ [°] and bolt axial tension F [kN]. After tightening the nuts and bolts until rundown condition, the relationships become linear in both experiments and FEM analyses. However, the values of bolt axial tensions obtained by FEM analyses are a little higher than experimental ones at a same rotation angle. Also, stress distributions of the bolted joints are revealed.
  • 被締結物がクリープするねじ締結体の変形解析とボルト軸力低下について  [Not invited]
    両角由貴夫; 増田大貴; 玄馬之善; 大宮祐也; 藤井正浩
    日本機械学会 M&M2018 材料力学カンファレンス  2018/12
  • 被締結物がクリープ変形するねじ締結体における軸力低下に及ぼす平座金の効果  [Not invited]
    増田大貴; 大宮祐也; 両角由貴夫; 藤井正浩; 玄馬之善
    日本機械学会 M&M2018 材料力学カンファレンス  2018/12
  • Behaviors of Axial Bolt Forces in Larger Diameter Pipe Flange Connection with RJG under Bolt Tightening
    OMIYA Yuya; FUJII Masahiro; MANABE Kazuki; ZHU Wanyu
    The Proceedings of the Machine Design and Tribology Division meeting in JSME  2018  The Japan Society of Mechanical Engineers
     
    Since a scatter in axial bolt force exists in assembling the pipe flange connections, it is important to understand the behavior of scatter in axial bolt force of pipe flange connection. In this study, the bolt tightening tests with torque control method (tightening procedure: ASME PCC-1) were done to investigate the behavior of axial bolt force in pipe flange connection with 20 inches nominal diameter with Ring Joint Gasket. The obtained results on the standard deviation in axial bolt force were compared with that of the nut factor measured before bolt tightening. As a result, it is found that the experimentally obtained standard deviation in axial bolt force as assembled was correlated strongly with standard deviation of nut factor.
  • 木材由来ナノカーボン分散水潤滑下におけるポリアセタールのトライボロジー特性
    中植大介; 大宮祐也; 藤井正浩; 木之下博
    日本設計工学会研究発表講演会講演論文集  2018
  • 木材由来酸化ナノカーボン-ZnDTP複合添加潤滑油の摩擦特性に及ぼす面圧とすべり速度の影響
    西崎僚太; 大宮祐也; 藤井正浩; 木之下博
    日本設計工学会研究発表講演会講演論文集  2018
  • 鋼ローラのスカッフィングに及ぼす微粒子ショットピーニングの影響
    関下裕伸; 藤井正浩; 大宮祐也; 石本興史; 上田朗弘
    日本設計工学会研究発表講演会講演論文集  2018
  • ボルト締結体における被締結部材の材料特性が座面陥没量に及ぼす影響
    川口隼己; 大宮祐也; 藤井正浩
    日本設計工学会研究発表講演会講演論文集  2018
  • 面接触摺動下における木材由来カーボン添加グリースのトライボロジー特性
    谷家大樹; 大宮祐也; 藤井正浩; 塩田忠
    日本設計工学会研究発表講演会講演論文集  2018
  • Degradation of Axial Bolt Force caused by Creep Behavior: (Influence of Clamped parts and Female Screw Thread Materials)
    WATANABE Tadatoshi; OMIYA Yuya; FUJII Masahiro
    The Proceedings of Mechanical Engineering Congress, Japan  2018  The Japan Society of Mechanical Engineers
     
    To investigate the trend of bolt force degradation, an experimental and FEM analytical approaches had been conducted. Experiment conditions were as temperature of tightened specimen at 130deg for 200 hours. The transition of axial bolt force during the experiment was recorded. Specimen was composed by steel bolt, clamped part and female thread part which made by steel or aluminum alloy. As experimental results, it is found that axial bolt force degrades logarithmically. This transition is the influence of creep behavior of material. Degradation range is greater in case with aluminum parts than in case with steel parts. And especially material of female thread part has much influence than that of clamped part. From FEM analysis, creep strain observed at female thread and bearing surface of bolt flange.
  • Mechanical behavior of joints with tap bolt subjected to thermal load  [Not invited]
    Haruka Yamamoto; Yuya Omiya; Tadatoshi Watanabe; Masahiro Fujii
    自動車技術;年秋季大会  2017/10
  • 被締結物のクリープによるねじ締結体のボルト軸力低下  [Not invited]
    両角由貴夫; 大宮祐也; 増田大貴; 藤井正浩
    日本機械学会 M&M2017 材料力学カンファレンス  2017/10
  • 異種材料の摩擦撹拌点接合の熱的挙動に及ぼす加圧力及び回転数の影響
    冨岡俊介; 大宮祐也; 西口勝也; 島田聡子; 藤井正浩
    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)  2017
  • 樹脂の摩擦・摩耗に及ぼす添加した酸化ナノカーボンの形状と濃度の影響
    河元広樹; 行好祐介; 大宮祐也; 藤井正浩; 木之下博
    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)  2017
  • 潤滑油における酸化ナノカーボンと他添加剤との併用効果-往復動摩擦試験での添加濃度の影響-
    杉峯健太; 中植大介; 大宮祐也; 藤井正浩; 木之下博
    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)  2017
  • 転動疲労挙動に及ぼす潤滑油への酸化ナノカーボン分散の影響-表面粗さの変化と寿命への影響-
    竹本和樹; 菊地大樹; 大宮祐也; 藤井正浩; 神田信; 栃木弘; 木之下博
    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)  2017
  • Axial Bolt Changes in Smaller Nominal Diameter of Pipe Flange Connections under Thermal Changes
    ISHIDO Kenta; OMIYA Yuya; FUJII Masahiro
    The Proceedings of Yamanashi District Conference  2016  The Japan Society of Mechanical Engineers
  • トルク法を用いた多数ボルト締結体の締付け挙動
    大宮祐也; 藤井正浩
    日本設計工学会研究発表講演会講演論文集  2016
  • Deformations and stresses analyses of the bolted joints with dissimilar materials fastened under temperature change: (In case of plural bolts)
    MOROZUMI Yukio; OMIYA Yuya; FUJII Masahiro
    The Proceedings of Mechanical Engineering Congress, Japan  2016  The Japan Society of Mechanical Engineers
     
    In developing new car, the weight reduction is important issue. As one of solutions, the application of light weight materials is considerable. In the case, the bolted joints with dissimilar materials are sometimes needed. When the bolted joints are suffering from temperature change, they are deformed and the stress distributions occur, because each clamped part has different coefficient of linear thermal expansion. And the sliding forces also occur on the contact surfaces. In this study, those are analyzed by elasto-plastic FEM calculations for the different shape bolted joints. They consist of the aluminum specimen, the steel plate and four bolts. Different stress distributions and sliding forces are shown and discussed.
  • 高圧力作用下における金属平型ガスケットの微小漏えい量特性
    柴井裕太; 大宮祐也; 藤井正浩
    日本設計工学会中国支部講演論文集  2015
  • 粘弾性材料の摩擦特性に及ぼすレーザーテクスチャリングの効果
    藤井正浩; 石田幹久; 大宮祐也; 石田浩規
    日本設計工学会中国支部講演論文集  2015
  • ボルト締結体のねじ谷底における応力分布にボルト呼び径が及ぼす影響
    田村直樹; 大宮祐也; 藤井正浩
    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)  2015
  • 509 Correlation on Scatter between Torque Coefficient and Bolt Preload in Pipe Flange Connection Tightened by Torque Method
    OMIYA Yuya; ITANO Koji; FUJII Masahiro; YOSHII Daichi
    The Proceedings of Yamanashi District Conference  2015  The Japan Society of Mechanical Engineers
  • 510 Effect of Scattered Bolt Preload on Micro Leakage from Pipe Flange Connection
    OMIYA Yuya; ITANO Koji; FUJII Masahiro
    The Proceedings of Yamanashi District Conference  2015  The Japan Society of Mechanical Engineers
  • 502 Effect of Engagement Length on Stress Distribution at Screw Thread in Bolted Joint
    TAMURA Naoki; OMIYA Yuya; FUJII Masahiro
    The Proceedings of Yamanashi District Conference  2015  The Japan Society of Mechanical Engineers
  • GS0104-201 Sealing Performance Experiment and Stress Analysis of Metal Gaskets under High Internal Pressure
    SHIBAI Yuta; OMIYA Yuya; FUJII Masahiro
    The Proceedings of the Materials and Mechanics Conference  2015  The Japan Society of Mechanical Engineers
     
    In order to examine the sealing mechanism of a connection with a metal gasket, the sealing test according to JIS B2490 and FEM analysis were carried out. The dimensions of platen used in the test are according to JIS B 2490 and the metal gasket types are chosen as metal flat and ring joint gasket. The material of the gaskets was aluminum. The ring joint gasket types are chosen as octagonal and oval. The effect of internal pressure on the sealing performance of connection with the metal flat gaskets was measured. The relationship between the gasket compression stress and amount of leakage through inter faces on the metal flat gasket was obtained. And also, the relationship between compression load and amount of leakage through inter faces on the ring joint gaskets was obtained. The von Mises stress distributions on the interface on the metal gaskets were calculated using FEM. Using the results of sealing test and FEM, it was suggested that the sealing performance was improved, when the von Mises stress more than the gaskets material of the yield stress adequately. Furthermore, it was suggested experimentally that the ratio of the maximum of von Mises stress in the gaskets material of yield stress was 1.015.
  • S1130106 Deformations and Stresses Analyses of the Bolted Joints with Dissimilar Materials under Temperature Change
    MOROZUMI Yukio; OMIYA Yuya; FUJII Masahiro
    The Proceedings of Mechanical Engineering Congress, Japan  2015  The Japan Society of Mechanical Engineers
     
    Recently it is important to reduce the car weight for fuel consumption improvement. One of the solutions is to exchange materials from steel to light weight materials. In this case, the bolted joints with dissimilar materials sometimes are needed. When temperature change occurs on the bolted joints, expansions of two clamped parts are different due to different coefficient of linear thermal expansion. And that causes the sliding force on the contact surface between two clamped parts. In this study, the deformations and the stress distributions under temperature change are analyzed by FEM for the bolted joints that consist of the rectangular aluminum plate, the steel plate and two bolts. Finally, comparisons in the sliding force between the simplified calculations by the spring models and FEM analyses are conducted for several dimensions of the plates.
  • 102 A Design Method of Tightening Torque Based on Amount of Leakage for Pipe Flange Connection Taking Account of Bolt Preload Scatter
    ITANO Koji; OMIYA Yuya; FUJII Masahiro
    The Proceedings of Conference of Chugoku-Shikoku Branch  2015/02  The Japan Society of Mechanical Engineers
  • 652 Effects of Scattered Axial Bolt Forces on Sealing Performance of Pipe Flange Connection with a Non-asbestos Gasket under Internal Pressure
    OMIYA Yuya; ITANO Koji; FUJII Masahiro
    The Proceedings of Yamanashi District Conference  2014/10  The Japan Society of Mechanical Engineers
  • 1102 Stress Analysis and Stress Concentration Factor at Bolt root in the Initial Clamping State
    ISHIMURA Mitsutoshi; SAWA Shinichiro; OMIYA Yuya
    The Proceedings of Conference of Kansai Branch  2014/03  The Japan Society of Mechanical Engineers
  • 1101 Mechanism of Screw Thread Loosening in Bolted Joints with Non-symmetrical Clamped Parts under Repeated Temperature Changes
    ISHIMURA Mitsutoshi; SAWA Shunichiro; OMIYA Yuya
    The Proceedings of Conference of Kansai Branch  2014/03  The Japan Society of Mechanical Engineers
  • 651 A Determination Method of Bolt Preload for Bolted Pipe Flange Connections with Metal Flat Gaskets under Internal Pressure taking account of the allowable leak rates
    KONDO Koji; OMIYA Yuya; TSUBAKI Shota; SAWA Toshiyuki
    The Proceedings of Yamanashi District Conference  2014  The Japan Society of Mechanical Engineers
  • 659 The Stress Analysis and the Sealing Performance Evaluation of bolted Pipe Flange Connections with Non-Asbestos Gasket under Internal Pressure
    SAWA Toshiyuki; OMIYA Yuya; TAKAGI Yoshio
    The Proceedings of Yamanashi District Conference  2014  The Japan Society of Mechanical Engineers
  • G0310401 Effects of Plane Washers on Plastic Deformation at Bearing Surfaces in Bolted Joints
    MOROZUMI Yukio; SAWA Toshiyuki; OMIYA Yuya
    The Proceedings of Mechanical Engineering Congress, Japan  2014  The Japan Society of Mechanical Engineers
     
    Plain washers are used to increase the area of the bearing surfaces in bolted joints. It was investigated that even if the average contact stress between a washer and a clamped part was the same, a thinner washer showed larger plastic deformation at the bearing surfaces after the bolt tightening. It is thought that this is because the real contact area decreases due to the warp of the plain washer. In this paper, mean permanent sets w^^- at the bearing surfaces are calculated based on elasto-plastic FEM analyses for several bolt sizes of the hexagon head bolted joints with plain washers. The deflection parameter k_w is proposed to introduce as a equation for calculating the mean permanent set by hand easily, and it is shown that the proposed method is effective to determine appropriate thickness of a plain washer.
  • 静的曲げモーメントを受けるスカーフバンド接着継手のFEM応力解析と強度
    中野博子; 大宮祐也; 関口泰久; 沢俊行; 朴文官
    日本接着学会年次大会講演要旨集(CD-ROM)  2013
  • 引張り荷重を受ける異種材料被着体によるスカーフ接着継手のFEM応力解析と強度(被着体幅の影響)
    中野博子; 大宮祐也; 関口泰久; 沢俊行
    日本接着学会年次大会講演要旨集(CD-ROM)  2013
  • 806 Effects of Plane Washer on Elasto-Plastic Contact Stresses and Deformations in Bolted Joints
    MOROZUMI Yukio; SAWA Toshiyuki; OMIYA Yuya
    The Proceedings of Yamanashi District Conference  2013  The Japan Society of Mechanical Engineers
  • 853 Sealing Performance Evaluation of Pipe Flange Connections under Cyclic Internal Pressure and Therml Condition
    OMIYA Yuya; SAWA Toshiyuki
    The Proceedings of Yamanashi District Conference  2013  The Japan Society of Mechanical Engineers
  • 854 Sealing Performance Evaluation of Pipe Flange Connections under External Bending Moment
    TAKAGI Yoshio; SAWA Toshiyuki; OMIYA Yuya
    The Proceedings of Yamanashi District Conference  2013  The Japan Society of Mechanical Engineers
  • 856 SEALING PERFORMANCE EVALUATION IN BOLTED FLANGE CONNECTIONS WITH RING TYPE JOINT GASKET UNDER INTERNAL PRESSURE
    KONDO Koji; TSUBAK Shota; SAWA Toshiyuki; OMIYA Yuya; SATO Koji
    The Proceedings of Yamanashi District Conference  2013  The Japan Society of Mechanical Engineers
  • 857 FEM Calculations and Evaluation of Sealing Performance in comparison of Raised Face and Flat Face Flange connections
    Kurosawa Ryo; Sawa Toshiyuki; Kobayashi Takashi; Omiya Yuya; Tenma Kentaro
    The Proceedings of Yamanashi District Conference  2013  The Japan Society of Mechanical Engineers
  • OS1408 FEM stress analysis and the sealing performance evaluation in bolted flange connections with ring joint gasket subjected to internal pressure : Effect of scatter in bolt preloads
    KONDO Koji; TSUBAKI Shota; SAWA Toshiyuki; KIKUCHI Tsutomu; OMIYA Yuya
    The Proceedings of the Materials and Mechanics Conference  2012  The Japan Society of Mechanical Engineers
     
    Bolted flange connections with ring joint gaskets have been used to seal the inner fluid under higher internal pressure and higher temperature conditions where soft gaskets such as compressed sheet gaskets cannot be applied. Bolted flange connections are frequently tightened using torque wrench, and it is known that the values of bolt preloads are scattered. The effect of the scatter on the sealing performance for bolted flange connections with compressed sheet gasket or semi-metal gasket has been examined. However, no research on the characteristics for the bolted flange connections with ring joint gasket has been carried out. It is necessary to know the effect of the scattered bolt preloads on the sealing performance and mechanical behavior of the connection with ring joint gasket. In addition, it is important to know an optimum method for determining the bolt preloads taking account of the scatter in bolt preloads. In this paper, leakage tests for bolted flange connections with octagonal ring joint gaskets were conducted for cases where the bolt preloads are uniform and scattered. The sealing performance of these connections with ring joint gaskets was measured and evaluated. In addition, the leak rate was estimated using the contact gasket stress distributions of the connections when the bolt preloads were uniform and scattered using 3-D FEM. Finally, the measured leak rate for the connection using helium gas was compared with the estimated results. The estimated results are in fairly good agreement with the measured values. It is found that the sealing performance of the connections tightened with the uniform bolt methods is better than that with scattered bolt preloads.
  • OS1403 Elasto-plastic Stress Analyses and Deformations at the Bearing Surfaces in Bolted Joints with Plain Washers
    MOROZUMI Yukio; OKUMURA Masahiko; SAWA Toshiyuki; OMIYA Yuya
    The Proceedings of the Materials and Mechanics Conference  2012  The Japan Society of Mechanical Engineers
     
    The effect of the plain washer's thickness on the contact stress distributions and the plastic displacements (permanent set) at the bearing surfaces are analyzed using elasto-plastic FEM analyses in case of the initial bolt clamping state. It is found that the contact stress and the plastic deformation decrease as the thickness of washer increases. It is shown that the plastic displacements at the bearing surfaces in case of hexagon bolts with flanges are smaller than in case of hexagon head bolts. Also even if the average contact stress is the same at the bearing surface, the plastic displacements are smaller in case of smaller bolt holes of clamped parts.
  • OS1407 Finite Element Stress Analysis and Sealing Performance Evaluation of Pipe Flange Connection Subjected to External Bending Moment : Effect of Scattered Bolt Preload
    DOI Hayato; SAWA Toshiyuki; TAKAGI Yoshio; SATO Koji; OMIYA Yuya
    The Proceedings of the Materials and Mechanics Conference  2012  The Japan Society of Mechanical Engineers
     
    Pipe flange connections have been widely used in mechanical structures such as power, chemical plants and so on. Sometimes leakage accidents occur from the connections. In assembling the pipe flange connections, the bolt preloads are scattered and then the connections are subjected to external bending moment due to earthquakes as well as internal pressure. In the present paper, the changes in the axial bolt forces are measured in assembling. The bolts are tightened with torque wrench. Using the history of the axial bolt force changes and FEM calculation the gasket stress distribution is estimated. The amount of leakage of the connection was measured. It is found that the effect of the scatter of bolt preload is substantial on the sealing performance of the connections. And it is found that the effect of the scatter of bolt preload and the effect of bending moment can be added. The changes in axial bolt forces obtained from experimental result are in a fairly good agreement with FEM result.
  • OS1412 FEM Calculations and Evaluation of Sealing Performance in Box-Shaped Flange Gasket Connections : The effect of the bolt tightening procedure and bolt spacing
    KUROSAWA Ryo; SAWA Toshiyuki; OMIYA Yuya; TENMA Kenatro; KOBAYASHI Takashi
    The Proceedings of the Materials and Mechanics Conference  2012  The Japan Society of Mechanical Engineers
     
    Bolted connections with gasket such as box-shaped flange connections have been widely used in mechanical structures, such as nuclear and chemical industry, and so on. They are usually used under internal pressure. The high sealing performance of flange connection is required to avoid the unexpected leakage accident. The two methods, which are Diagonal and Clock-wised, are used in the bolts tightening procedure for the pipe flange connection. The effects of the difference between Diagonal and Clock-wised method on the sealing performance of pipe flange connection have been examined. In this paper, the contact gasket stresses of these connections under internal pressure are analyzed using the finite element method (FEM) of each bolting procedure, taking into account a hysteresis in the stress-displacement curve of a gasket. And then, using the contact gasket stress distributions obtained from FE analysis and the relationship between gasket stress and leak rate obtained from a gasket sealing test, a method for estimating an amount of leakage is examined. The leakage tests were also conducted to measure an amount of gas leakage using an actual box-shape flange connection with the gasket. In addition, the effect of bolt spacing is examined on the sealing performances of box-shape flange connections under internal pressure. The effects of the above factors are discussed on the sealing performance in designing box-shape flange connections.
  • 651 Sealing Performance Evaluation of Pipe Flange Connections under Cyclic Thermal Condition
    OMIYA Yuya; SAWA Toshiyuki; TAKAGI Yoshio
    The Proceedings of Yamanashi District Conference  2011  The Japan Society of Mechanical Engineers
  • 659 Evaluation of Sealing Performance and FEM Calculations in Bolted Flange Connections with Ring Joint Gasket Subjected to Internal Pressure
    Tsubaki Shota; SAWA Toshiyuki; OMIYA Yuya; TENMA Kentaro; KONDO Koji
    The Proceedings of Yamanashi District Conference  2011  The Japan Society of Mechanical Engineers
  • 808 FEM stress analysis and sealing performance of bolted connections with larger nominal diameter subjected to internal pressure : effect of scatter in bolt preloads
    OMIYA Yuya; TAKAGI Yoshio; TORII Hiroyasu; SAWA Toshiyuki; HORIUCHI Kazuhide
    The Proceedings of the Materials and Mechanics Conference  2010  The Japan Society of Mechanical Engineers
     
    It has been well known that a scatter in axial bolt forces in pipe flange connections tightened by the torque control method is substantial. In practice, pipe flange connections with the larger nominal diameter tightened by the torque control method have been used in chemical industry, and so on. In some study, the characteristics of the connections with smaller nominal diameter (less than 8") have been examined. So, in an optimum design of pipe flange connections with gaskets, it is necessary to understand the characteristics of the pipe flange connections with large nominal diameter under internal pressure and the contact gasket distributions due to the scatter in axial bolt forces in the connections tightened by the torque control method. In this paper, the experimental and FE analyses were done to evaluate the effect of scatter in axial bolt force on the gasket stress distribution and the sealing performance of pipe flange connections with 20" nominal diameter. Two types of torque controlled assembling procedures and an effect of scatter in the axial bolt forces obtained from the above methods is examined. Then, the effect of scatter in the axial bolt forces on the sealing performance of the connection is evaluated. The contact stress distribution in the larger pipe flange connection with 20" nominal diameter under internal pressure is analyzed using FEM by taking into account a non-linearity and a hysteresis. The measured scatter in the axial bolt forces is applied in the FEM calculations.
  • 810 Effect of external bending moment on the sealing performance of pipe flange connection
    TORII Hiroyasu; TAKAGI Yoshio; OMIYA Yuya; SAWA Toshiyuki
    The Proceedings of the Materials and Mechanics Conference  2010  The Japan Society of Mechanical Engineers
     
    Since an external bending moment affected the sealing performance of pipe flange connection, it was important to investigate this effect. This paper analyzed the contact gasket stress distribution of pipe flange connections and evaluated the effect of external bending moment on the sealing performance from the viewpoint of changes in contact gasket stress. The study included the FE analyses and the experimental leakage tests. The FE analyses revealed the large decrease of contact gasket stress at tension side and small increase at compression side. The difference in change in contact gasket stress was caused by the non-linear hysterics characteristics of stress-displacement curve of gasket. The FE analyses also revealed that the loading order, internal pressure and external bending moment, also affected the sealing performance due to the non-linear deformation characteristic of the gasket. The experimental leakage tests using helium (He) gas were analyzed by the finite element method and discussed. This paper also evaluated the stress distribution in the pipe flange under external bending moment. The results suggested that the hub stress dominated the flange structure and the most important factor in designing the flange.
  • 811 THE STRESS ANALYSIS AND THE SEALING PERFORMANCE EVALUATION OF THE PIPE FLANGE CONECTION SUBJECTED TO INTERNAL PRESSUER UNDR THERMAL CHANGES
    SUEYOSHI Junichi; TAKAGI Yoshio; TORII Hiroyasu; SAWA Toshiyuki; OMIYA Yuya
    The Proceedings of the Materials and Mechanics Conference  2010  The Japan Society of Mechanical Engineers
     
    The authors have been evaluating the effects of the material properties of spiral wound gaskets(SWG) and the sealing performance of the pipe flange connections at thermal changes with numerical and experimental analysis. In this experiment we used 3" pipe flange connections and tightened by torque wrench. And then, we heated and measured leak volume. On the other hand we evaluated with the experimental leakage test and 3-D FE analysis in this study. Considering the circumstances mentioned above, we inspected stress analysis under scatter on bolt preloads and thermal changes.
  • 604 The effects of the scattered axial bolt preload on sealing performance in large nominal diameter flange connection with gasket
    OMIYA Yuya; TAKAGI Yoshio; SAWA Toshiyuki; TORII Yasuhiro
    The Proceedings of Yamanashi District Conference  2010  The Japan Society of Mechanical Engineers
  • インパクトレンチによるフランジ締結体のボルト締付け試験
    澤俊行; 大宮祐也; 近藤康治; 宮下藍
    日本高圧力技術協会春季講演会概要集  2009
  • 654 Stress Analysis and Sealing Performance Evaluation in Box-shaped Flange Bolted Connections Subjected to Internal Pressure
    TENMA Kentaro; KUROSAWA Ryo; SAWA Toshiyuki; OMIYA Yuya
    The Proceedings of Yamanashi District Conference  2009  The Japan Society of Mechanical Engineers
  • 655 The sealing performance evaluation of bolted flexible Box-shaped flange joints under thermal conduction conditions
    黒沢 亮; 沢 俊行; 天満 健太郎; 大宮 祐也
    The Proceedings of Yamanashi District Conference  2009  The Japan Society of Mechanical Engineers
  • 656 The Stress Analysis and the Sealing Performance Evaluation of the pipe Flange Connection at Elevated Temperature
    TAKAGI Yoshio; SAWA Toshiyuki; OMIYA Yuya
    The Proceedings of Yamanashi District Conference  2009  The Japan Society of Mechanical Engineers
  • 657 Evaluation of sealing performance of pipe flange connection subjected to external bending moments
    TORII Hiroyasu; TAKAGI Yoshio; OMIYA Yuya; FUNADA Kensuke; SAWA Toshiyuki
    The Proceedings of Yamanashi District Conference  2009  The Japan Society of Mechanical Engineers
  • 501 FEM Stress Analysis of the Sealing Performance in Box-shaped Flange Bolted Joints with Non-Asbestos compressed Sheet Gaskets Subjected to Internal Pressure
    黒沢 亮; 沢 俊行; 永田 聡; 大宮 祐也
    The Proceedings of Yamanashi District Conference  2008  The Japan Society of Mechanical Engineers
  • 557 FEM Stress Analysis and Sealing Performance Evaluation of Pipe Flange Connections with Compressed Non-asbestos Sheet Gasket under Internal Pressure and Thermal Changes : Effect of Scatter in Bolt Preloads
    TAKAGI Yoshio; SAWA Toshiyuki; IWAMOTO Takeshi; OMIYA Yuya
    The Proceedings of Yamanashi District Conference  2008  The Japan Society of Mechanical Engineers
  • OS0502 FEM Stress Analysis of the Sealing Performance in Box-shaped Flange Bolted Joints with Non-Asbestos compressed Sheet Gaskets Subjected to Internal Pressure
    黒沢 亮; 沢 俊行; 永田 聡; 大宮 祐也
    The Proceedings of the Materials and Mechanics Conference  2008  The Japan Society of Mechanical Engineers
  • OS0511 FEM stress analysis and leakage evaluation of bolted flange connections with larger nominal diameter subjected to internal pressure : effect of scatter in initial bolt loads
    TAKAGI Yoshio; SAWA Toshiyuki; OMIYA Takuya; TANAKA Shota
    The Proceedings of the Materials and Mechanics Conference  2008  The Japan Society of Mechanical Engineers
     
    本研究では,内圧を受ける20インチフランジ締結体のボルト初期締め付け力のばらつきの影響について調べた.ガスケットの応力-ひずみ曲線のヒステリシスおよび非線形性を考慮した有限要素解析法によりガスケット接触応力分布を算出し,実際に実験を行うことでトルク管理法におけるボルト初期締め付け力のばらつきとその影響による漏洩量を測定し,両者の結果を比較検討した.その結果,ボルト軸力管理法に比べてトルク管理法(ASME法,HPIS法)ではいずれもボルト軸力がばらつき,目標ボルト締め付け力に達しないことが示された.
  • OS0512 FEM stress analysis and Sealing Performance Evaluation of Pipe Flange Connections under Internal Pressure and Thermal Changes : Effect of Scatter in Bolts Preloads
    TANAGI Yoshio; SAWA Toshiyuki; IWAMOTO Takeshi; OMIYA Yuya
    The Proceedings of the Materials and Mechanics Conference  2008  The Japan Society of Mechanical Engineers
     
    機械構造物の配管の締付け方法として一般的に広く用いられる方法としてトルク法がある.そのトルク法によるボルト締付けによって生じるボルト軸力のばらつきが温度変動及び内圧作用下でのガスケット付管フランジ締結体の漏洩に及ぼす影響を,三次元有限要素法を用いたガスケット接触面の応力解析,及び実際のガスケット付管フランジ締結体を用いた漏洩実験の両面より検討し,漏洩基準の締付け効率を検討した.

MISC

  • Effect of alumina nano-coatings on fretting wear of metal alloys for artificial joints
    塩田忠; 永栄謙登; 大宮祐也; 藤井正浩  日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)  2023-  2023
  • Influences of Material and Surface Roughness of the Clamped Parts on the Tightening Angle-Bolt Axial Force Relationships in the Tightening Processes of the Bolted joints
    両角由貴夫; 大宮祐也; 小松優太; 塩田忠; 藤井正浩  日本機械学会M&M材料力学カンファレンス(CD-ROM)  2023-  2023
  • 配管ボルト接合部のボルト軸力挙動について : 運転時およびボルト締付け時において—Behavior of Axial Bolt Force at Bolted Connection in Pipeline : Under Operation and Bolt Tightening—ねじに関する最新の研究事例
    大宮 祐也  設計工学 = Journal of Japan Society for Design Engineering : 日本設計工学会誌  57-  (3)  126  -130  2022/03
  • Effect of Argon ion bombard treatment on adhesion between aluminum alloy and epoxy resin
    中西亮太; 山本航平; 大宮祐也  岡山県工業技術センター報告  (47)  43  -45  2021/08
  • 締付け管理と緩みから考えるねじ締結体の信頼性—特集 ねじ締結体設計と安全管理のポイント
    大宮 祐也  機械設計 = Machine design  65-  (6)  24  -28  2021/05
  • OMIYA Yuya  JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS  66-  (3)  174  -174  2021/03
  • OMIYA Yuya  JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS  65-  (7)  397  -397  2020/07
  • 洋上風力発電機の長寿命化に向けた潤滑×シミュレーション技術のNEDOプロジェクト開始—特集 ソフトマターの分析・解析技術
    甲嶋 宏明; 小別所 匡寛; 横山 翔; 大宮 祐也; 阿保 政義; 松本 直浩; 木之下 博; 鷲津 仁志  Soft matter = ソフトマター : “やわらかい物質”と計測・評価の技術情報誌  (31)  20  -22  2020
  • Establishment of Zero-nanoleak at Joint part of Next Generation Plant and Hydrogen Fuel Line
    大宮祐也  Annual Report of the Okayama Foundation for Science and Technology  (29)  121  -126  2020
  • ボルト-ねじ締付け施工における各種注意点について
    Yuya OMIYA  Journal of Japan Research Institute for Screw Thread and Fasteners  50-  (11)  321  -325  2019/11
  • 各種プラント内での配管接合面からの漏えいについて
    Yuya OMIYA  Journal of Japan Research Institute for Screw Thread and Fasteners  48-  (2)  37  -41  2017/02
  • MOROZUMI Yukio; OMIYA Yuya; FUJII Masahiro  The Proceedings of Mechanical Engineering Congress, Japan  2015-  _S1130106  --_S1130106-  2015
  • WATANABE Osamu; FUJIOKA Terutaka; YANAGIDA Nobuyoshi; KISO Tomoaki; OMIYA Yuya; TAHARA Takayasu  Journal of High Pressure Institute of Japan  51-  (2)  60  -70  2013/03
  • フランジ・ガスケット締結体の基礎と漏えい事故防止技術の動向
    澤 俊行; 大宮 祐也  配管技術 = The piping engineering / 配管技術編集委員会 編  54-  (10)  24  -30  2012/09
  • ASMEにおける新しいフランジ設計法について
    Toshiyuki SAWA; Takashi KOBAYASHI; Yuya OMIYA  Plant Piping & Equipment  51-  (1)  19  -28  2011/01
  • TORII Hiroyasu; TAKAGI Yoshio; OMIYA Yuya; SAWA Toshiyuki  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A  77-  (777)  718  -721  2011

Industrial Property Rights

  • 両角 由貴夫, 大宮 祐也, 服部 望, 牧野 貴明, 石原 修二  トヨタ自動車株式会社, 国立大学法人 岡山大学, 株式会社三井E&Sマシナリー  202303006064479931

Awards & Honors

  • 2018/11 ねじ研究協会研究委員会 第1回ねじ研究シンポジウム 奨励賞
     ボルト締結体を昇温した際の軸力挙動 
    受賞者: 渡邉忠俊,大宮祐也,藤井正浩
  • 2018/07 公益財団法人 岡山工学振興会 岡山県産業振興財団科学技術賞
     次世代プラントおよび水素燃料ライン等のジョイント部におけるゼロナノリークの確立 
    受賞者: Yuya OMIYA
  • 2016/07 ASME the Pressure Vessels & Piping Division Co-Authoring the Outstanding Technical Paper
     Effect of Scatter in Axial Bolt Force on the Sealing Performance of 20" inch Pipe Flange Connections with CSG under Internal Pressure 
    受賞者: Koji Itano, Yuya Omiya
  • 2015/05 一般社団法人 日本高圧力技術協会 科学技術賞
     内圧作用下における金属平型ガスケット付きフランジ締結体の密封特性 
    受賞者: 近藤 康治;椿 翔太;大宮 祐也;沢 俊行

Research Grants & Projects

  • Cello mechanics ~Focusing on endpin and bows~
    Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Date (from‐to) : 2021/04 -2024/03 
    Author : 林 裕; 鷲津 仁志; 大宮 祐也; 木之下 博
     
    比較的小柄な人は、チェロを豊かに響かせたり、音のかすれをなくし高音・高速な曲においても正確に演奏したりすることに、不利な面があると言える。一般的に直線のエンドピン（足のような棒）を使用してチェロは演奏される。人によっては両足で十分に楽器を挟めない事や、届かなかい事があり、楽器から本来の音を出せていない事が多い。ヴァイオリン属などの擦弦楽器は、弓で弦を擦って音を出す。ここで、理解をするためにステーキを切る事に例えると、ナイフだけで切るのか、力の弱い子供がフォークを使用するのか、一般成人がフォークで刺してステーキを支えるのかによって、切れ味は変わる。このように楽器を支えられているかで音は変わってくる。 楽器の奏法を変えずに、重心と回転軸と重みの変化でベクトルが変わり、楽器を安定して支えられる事の証明が、本研究の第一課題となる。チェロ本体の制御性に関する有限要素法解析により、国際特許を取得しているイナズマエンドピンを使用した楽器だと、安定して支えられている事が解った。また、当該年度に予定していなかった楽器の重心を低くさせるための錘（ペザンテ）を作成する事ができ、踏み込んだ検証ができたのは大きな成果であった。 また、沖縄科学技術大学にて、世界的チェリスト ヨーヨー・マ氏に本研究をお伝えできたのは、世界に発信する重要な機会になった。 弓の構造および運動に関して、バロック弓およびモダン弓の相違を実演奏から予め体感していたため、利点を強調した弓の製作を開始した。具体的には、棹の反る場所の移動、棹を輪切りにした断面の異なる形状、重心のバランスと重みの配置に変化を施した。製作側は、普段は伝統に則って作製している。演奏者からの提案を具現化すると、別の問題点が生まれ、さじ加減と総合的なバランスが重要なことが解った。初年度に取り組み始めた事は理想的な形状を模索するにあたり、有意義であった。
  • Mechanism of Nano-leakage at Joint Interfaces in Next-generation Energy Line
    Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2019/04 -2022/03 
    Author : OMIYA YUYA
     
    Recently, the emission control of harmful substances emitted from chemical plants have become stricter worldwide. High sealing performance is required for pipe joints. Therefore, it is necessary to clarify the nano-leakage mechanism that occurs on the surface of metal gaskets. The purpose of this study is to clarify the compression deformation behavior at the surface and Nano leakage mechanism of the metal seal gasket. As a result, the deformation of the protruding peaks, cores, and protruding valleys that form the roughness of the metal surface showed different behaviors depending on the hardness difference of the metal and the compressive load. In addition, the valleys remained at the outer of the gasket as the initial surface roughness of the gasket was increased. It was shown that there is a relationship between the residual amount of valley and Nano leak.
  • Application of various innovative and inexpensive wood-based metal nanoparticles as a lubricant additive
    Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)
    Date (from‐to) : 2017/06 -2020/03 
    Author : KINOSHITA Hiroshi
     
    In this study, metal oxide nanoparticles were synthesized using wood with various metals and synthesis conditions. Moreover, frictional properties of the metal oxide nanoparticles dispersed in lubricating oil were investigated. When iron oxide nanoparticles and copper oxide nanoparticles were synthesized and dispersed in lubricating oil, both were improved in frictional properties compared to lubricating oil without the additives. The synthesized metal particles included amorphous carbon, thus they were heated in air to remove the amorphous carbon. In the case of copper oxide nanoparticles, it was found that the particle size became larger with increasing heating time. In the case of friction tests at room temperature, a sufficient reduction effect was obtained with an addition amount of more than 2 mass%. This is probably because a tribofilm of copper was formed on the substrate by the copper oxide nanoparticles when the addition amount was sufficient.
  • Inhibition of fatigue fractures using graphene oxide as innovative lubricant additive
    Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    Date (from‐to) : 2015/04 -2017/03 
    Author : KINOSHITA HIROSHI; FUJII Masahiro; NISHINA Yuta
     
    In order to prevent fatigue fractures by repeated stress, hardness of contact materials have been increased. However it is not sufficient. In this study, we carried out to improve fatigue life using dispersing graphene oxide in lubricating oil. Dispersion methods of graphene oxide in lubricating oil and rolling tester with minimum lubricating oils were developed. Improvement of fatigue life was achieved by the dispersing graphene oxide in the lubricating oil. However, formation of tribofilm which seems to greatly improve fatigue life was not achieved. In the future, in order to achieve further improvement of fatigue life, we will discover dispersants that will improve formation of tribofilms.

Teaching Experience

  • Research Works for Mechanical and Systems Engineering 2Research Works for Mechanical and Systems Engineering 2
  • Experiments in Mechanical EngineeringⅡExperiments in Mechanical EngineeringⅡ
  • Experiments in Mechanical EngineeringExperiments in Mechanical Engineering
  • Research Works for Mechanical and Systems Engineering 1Research Works for Mechanical and Systems Engineering 1
  • Experiments in Mechanical EngineeringIExperiments in Mechanical EngineeringI

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