Fatigue Life Prediction in Thick-Walled Cylinders with Complex Residual Stresses

摘要

The large variation in stress intensity factors corresponding to various material models for a single, radial, straight-fronted crack in a pressurized, partially autofrettaged cylinder leads to a drastic difference in the fatigue life predictions. None of the predicted lives agree with experimental results. Possible explanations of the discrepancy are given and corresponding correction factors are introduced. The predicted lives based on ther corrected stress intensity ranges are reasonably close to a set of well-documented experimental results of Throop and Fujczak. Keywords: Fatigue life, Radial crack, Thick-walled cylinder, Stress-intensity range, Shape factors, Negative K-Factor.