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Mechanism of Nano-leakage at Joint Interfaces in Next-generation Energy Line

Research Project

Project/Area Number 19K14877
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 18040:Machine elements and tribology-related
Research InstitutionOkayama University

Principal Investigator

OMIYA YUYA  岡山大学, 自然科学学域, 助教 (40717203)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords漏えい / ガスケット / シール / 表面粗さ / 塑性変形 / シーリング / 接触 / フランジ締結体 / ナノリーク / 金属接触 / 金属ガスケット / 金属接触挙動 / 密封メカニズム / 最適設計
Outline of Research at the Start

本研究では,メタルシールガスケットを用いた各種ジョイント部のゼロナノリークを達成するために,メタルシールガスケットを用いたジョイント部の密封特性および内部流体のナノリークメカニズムを明らかにすると共に,メタルシールガスケットを用いたジョイント部からのリーク量の推定方法およびナノリークを考慮したジョイント部設計方法を確立することを目指す.

Outline of Final Research Achievements

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.

Academic Significance and Societal Importance of the Research Achievements

本研究では,精密冶具を作成しメタル表面の変形挙動を測定し,接合面の未接触領域を明らかにした.このように表面性状を有するメタル表面の接触について実験結果をベースに評価することは,従来,行われていた理論的な議論に対して,実験的知見を示した.
また,メタルシールガスケットのナノリークメカニズムに関する結果は,ナノリークを考慮した合理的なフランジ寸法,ボルト初期締付け力の決定など設計因子の合理的決定に貢献した.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (2 results)

All 2021 2019

All Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] 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2021

    • Author(s)
      林大雅,大宮祐也,塩田忠,藤井正浩
    • Organizer
      トライボロジー会議2021 秋 松江
    • Related Report
      2021 Annual Research Report
  • [Presentation] LEAK BEHAVIOR AND PREDICTION OF METAL RING JOINT GASKETS IN SIMPLIFIED LEAK TEST WITH GROOVED PLATEN2019

    • Author(s)
      Yuya OMIYA
    • Organizer
      Pressure Vessels & Piping Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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