Abstract
Fatigue tests of SCM 440 chromium molybdenum steel were carried out under high mean stress. Prediction method of fatigue strength based on fracture mechanics was developed and the following conclusions reached. (1) It has been shown that the ΔKth becomes constant value at strain ratio Re > 0.5, just as the fatigue limit becomes constant at Re> 0.5 .(2) It has been shown that the fatigue diagram could make without fatigue tests, if the range of stress intensity factor ΔK of intrinsic crack was compared with ΔKth in various mean stress. (3) The prediction fatigue limit is in good agreement with the experimental value under high mean stress.
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