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Stresses in the propeller bosses induced during the shrink-fit process are raised at the fillets of the blades, and experiments carried out hitherto show that stress concentration factor is about 2. Main purpose of this paper is to estimate these concentrated stresses quantitatively. Using the finite element method, stress analyses were carried out for various shapes of simplified two dimensional bosses. Input data were fully automatically generated, and so the number of blades, width of blades and outer diameter of bosses could be varied parametrically without any difficulty. As a result of this investigation, the following equation was obtained for the standard types of bosses and blades, α =5.25η2-2.88η+2.09 where α = stress concentration factor η = total width of blades over outer periphery of the boss Propeller blades have also the strengthening effect on the boss rigidity, and the gripping force of the boss is raised by the blades. Equations which can roughly estimate this effect were also proposed. Three dimensional photoelastic models of the bosses with blades were made by casting, and analyzed experimentally for comparison with the numerical results of the two dimensional models, and a fairly good agreement was obtained.
公益社団法人日本マリンエンジニアリング学会の論文