プロペラ翼の折損に及ぼす主要因子の解明（第1報：材料欠陥及び流体力による変動応力の影響）

概要

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In recent year, many failures in marine propeller blades of Ni-A l-Bronze for motor car carriers were occurred. The high fluctuating stress on these blades induced by hydrodynamic force has been reported as the main cause of the troubles under the severe operating conditions including high ship speed. This paper presents the systematical investigations of the main factors affecting a blade failure of propeller for a chemical tanker, which seldom occurred in the past time. A few factors were extracted from many causes based on the examinations of the conditions of the blade failure and the hull. The early blade failure within one year was discussed in view of the estimations of the material defects by SEM and the fatigue life by fracture mechanics. It is shown that there is few possibilities of the early failure judging from the small initial defects and the ordinary hydrodynamic force.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文