Effect of Different Factors on the Sensitivity of Engineering Materials to Stress Concentration in the Case of Fatigue Loading

摘要

More accurate fatigue test results were used for verification of different calculation methods and for establishing a more reliable relationship between the notch factor and the notch radius. Scatter bands for the dependence of the notch sensitivity K (sub F)/K (sub T) on the notch radius were obtained for steel specimens with stress concentration factors K (sub T) is equal to or less than 3.6, with particular consideration of test results for large component similar specimens with large notch radii. The scatter bands of test points were plotted separately for tempered and normalized steels, but the rotating/bending and tension/compression test results were considered together. Their upper and lower boundaries were expressed analytically with a two parameter formula. This formula takes better into account the notch size effect than the formulas of Neuber, Peterson or Stieler.