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논문 기본 정보

자료유형
학술저널
저자정보
강효림 (동아대학교) 강수정 (동아대학교) 한승호 (동아대학교)
저널정보
한국기계가공학회 한국기계가공학회지 한국기계가공학회지 제23권 제4호
발행연도
2024.4
수록면
86 - 91 (6page)

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초록· 키워드

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Fittings used in the storage and transport of high-pressurized gaseous hydrogen vary according to their components. The recently developed LOK-type fitting uses double ferrules at both the front and back ends to prevent leakage of high-pressurized gaseous hydrogen. Because the hydrogen molecule is one of the smallest, the risk of leakage is high. Therefore, leak-tightness design requires an analysis of the contact stresses acting on the surfaces between the ferrules and the pipe of the double-ferrule-type fitting. In this study, mechanical behaviors, including plastic deformations that occur in the ferrules and pipe during the fastening of the fitting, were evaluated using nonlinear structural analysis for a double-ferrule fitting used with 70-MPa high-pressurized gaseous hydrogen. The contact stresses that occur on the ferrule contact surfaces and that directly affect leakage were then estimated, and the percolation theory was applied. Leak-tightness was achieved when the contact area with a contact stress that exceeded the internal pressure was greater than 40% of the entire contact area. When the required contact area was less than 40%, case studies were conducted in which the shape of the ferrules was modified. Based on these case studies, a fixed shape for ferrules was then proposed that met the requirements of leak-tightness based on percolation theory.

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ABSTRACT
1. 서론
2. 이중-페룰 피팅
3. 구조해석
4. 누설방지를 위한 형상설계
5. 결론
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