推進軸鞘金下に發生する罅裂の原因と其對策

概要

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During the repair of propeller shafts of a certain ship, which were docked in Nagasaki Works, Mitubisi Zyukogyo K.K. last year, many fine cracks were found out around the shaft surface coming into contact with the propellerboss in the vicinity of its fore end. As the results of investigation, these cracks were considered to be caused by teither ordinary corrosion nor fatigue, but by rubbing action with metal on metal, and it suggested the similar cracks hidden underneath the after end of the gun-metal sleeve. Therefore the after ends of the sleeve were removed for a few centimeters, and, as was expected, the similar cracks as above were discovered. In this paper, the author explained that, judging from the peculiarity of these cracks, their cause should be attributed to the combined action of repeated rubbing and stresses, and proposed a method to prevent such cracks developing on the shaft.
社団法人日本船舶海洋工学会の論文
1939-09-15