Taking the main shaft of a ship as the experimental object,the fatigue life of the joint be-tween the flange and the main shaft when 34CrNi3Mo alloy steel was used as the main shaft of a ship is studied.The joint between flange and spindle was simplified as a torsional fatigue specimen with U-shaped notch by experiment.Based on the small sample size median S-N experimental method,the fa-tigue analysis of 34CrNi3Mo alloy steel with stress concentration coefficient of 1.45 under torsional load was carried out,and its fatigue life under different stress amplitudes was measured and S-N curves were drawn to estimate its fatigue limit.Comparing the drawn S-N curve with the S-N curve of smooth specimen,it is found that the fatigue life is quite different.Using ABAQUS software and Fe-safe software for numerical simulation,the comparison between the experimental results and the drawn S-N curve shows that the equation of the S-N curve is very close to the experimental results,which verifies the correctness of the established numerical model.
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