Investigation of Fatigue Strength of High Polar-class Propeller
Based on the FEM calculation of the static strength under two groups of alternating ice loads issued in IACS rules,the fatigue performance of a PC2 ice-class propeller is analyzed under the fatigue criterion of stress-frequency spectrum and the criterion of cumulative fatigue damage respectively.A feasible calculation method for the fatigue strength of the ice-class propeller is proposed to analyze the effects of propeller skew,rake,hydrofoil profile,and mean stress correction on fatigue performance.For a typical polar-class propeller,positive skew and rake angles are favorable for its fatigue performance.The ice hydrofoil section with a thickened leading edge and trailing edge will improve the fatigue performance significantly and contribute to the quantitative of the polar-class propeller.The mean stress modification theory recommended by IACS is more conservative than the traditional correction theory.Through the monitoring data of the Xuelong 2 in the trail test,the fatigue calculation method of polar-class propellers under ice loads is verified.
polar class propellerfatigueMiner's accumulated fatigue damage ratiomean stress correction
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