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PC薄膜を用いた金属平形ガスケットの接触状態の観察
PC薄膜を用いた金属平形ガスケットの接触状態の観察
Observation of Real Contact Area at Gasket Surfaces using the Thin PC Film
新田, 勇
松崎, 良男
伊藤, 穣
日本機械学会
本文データは学会の許諾に基づくCiNiiからの複製である
Tribology
Machine Element
Coupling
Flat Metallic Gasket
Leakage
Thin Polymer Film
Real Contact Area
Surface Roughness
Gas Leak Test
To clarify leakage characteristics of the flat metallic gasket, the leakage rate of a gas and real contact area of the seal surfaces were measured under several closing loads. The static seal used in this study consisted of the ring-shaped copper gasket and the two steel flanges which held the gasket. The contact surfaces of the flanges were finished by the lathe. So far the following two directions on the gasket surface were pointed out as the leakage flow paths. One was the radial direction perpendicular to the lathe turning groove and the other was circumferential direction along the groove. As the closing loads increased, the leakage flow in the radial direction ceased and only the leakage flow in the circumferential direction remained. To determine the closing load, that is the contact pressure, at which the radial leakage flow ceases, the real contact situation on the gasket surface should be observed. In this paper the real contact area between the copper gasket and the steel flange was measured using the thin polymer film of 1 μm in thickness. As a result the contact pressure over which the radial leakage ceased could be predicted from the observation of the thin polymer film. In addition, the cross section of the aperture for the leakage flow in the circumferential direction was evaluated from measured real contact area, and the leakage rate was estimated by the assumption of laminar flow. It agreed well with the measured leakage rate.
日本機械学会
2005-01
jpn
journal article
http://hdl.handle.net/10191/5879
https://niigata-u.repo.nii.ac.jp/records/3774
http://ci.nii.ac.jp/naid/110006264523
AN00187463
03875024
日本機械学会論文集. C編
日本機械学会論文集. C編
71
701
265
271
https://niigata-u.repo.nii.ac.jp/record/3774/files/9_0177.pdf
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2019-07-30