Abstract
The initiation, propagation and closure behavior of microcracks were investigated through successive observations of fatigue process on the plain specimen surface in rotating bending tests of a mild steel, an α-brass and Al-alloys. The essential difference of crack initiation process and the behavior of microcracks was recognized between an age-hardened Al-alloy and the other annealed metals. Based on the results, the characteristics in fatigue under various loading conditions, such as 1. (i) fatigue behavior under two-steps loading, 2. (ii) coaxing effect of a low carbon steel and 3. (iii) size effect of a notched specimen and fatigue notch sensitivity, were consistently explained with special reference to the behavior of fatigue microcracks.
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