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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of the Faculty of Engineering, Nagasaki University > Volume 19, No. 32 >


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Title: 防食用塗装皮膜の剥離強度および塗装面の流体摩擦抵抗の研究
Other Titles: Study on the Adhesive Strength and the Hydraulic Frictional Resistance of Anticorrosive Paint
Authors: 今井, 康文 / 石田, 正弘 / 楠本, 韶
Authors (alternative): Imai, Yasufumi / Ishida, Masahiro / Kusumoto, Sho
Issue Date: Jan-1989
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, 19(32), pp.9-16; 1989
Abstract: Splitting of paint film seems phenomenologically quite analogous to the crack propagation through the continuous body. The tip of splitting represents the boundary separating the continuous body from the broken. The fracture mechanics, therefore, could be applied for the assessment of adhesion of paints in the same line as of adhesive joints in structures. In this paper, a theory has been developed to estimate the adhesive energy of paints. Isophthalic resin coating was splitted from the substrate by wedging and peeled lengthes were measured as a function of the wedge thickness. Employing the theory, adhesive energy was estimated to be 50-100 J/m2, which is quite resemble to the adhesive energy of epoxy resin to alminum alloy substrates. Additionally, the effect of painting on the reduction of hydraulic frictional resistance has been studied quantitatively using three cylinders with different surface roughness. When the relative surface roughness was decreased from 2.5 x 10-5 to 0.6 X 10-5 by painting and polishing, the frictional resistance was reduced by about 2% under the high Reynolds number condition. More effect of painting is expected for ships because the ship Reynolds number is higher than the present experiment.
URI: http://hdl.handle.net/10069/24281
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 19, No. 32

Citable URI : http://hdl.handle.net/10069/24281

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