Abstract
A study has been made of the effect of positive mean stress on allowable stress amplitude (fatigue limit) in 2Cr13 steel. The fatigue diagram obtained here does not coincide with the traditional one. The results indicate that the allowable stress amplitud is not decreased monotonically with increasing of positive mean stress, a peak value of allowable stress amplitude occurs at a certain mean stress instead. It is found that the compressive residual stress, which obtained at the minimum cross section of fatigue specimens, is not also decreased continously with increasing of mean stress. The position of peak value in σa-σm curve is fairly consistent with that in σr– σm curve. In consequence, the difference between present diagram and traditional one should be attributed to the effects of comprehensive residual stress, hardening and softening of materials during fatigue process.
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