Abstract
The effects of cycle frequency on the fatigue strength of carbon steels under simultaneous corrosion in city water or saline are studied. The stress σc given under corrosion fatigue increases to σck owing to the notch effect of corrosion pits. At a certain repetition number of N, σck reaches the fatigue strength σ of same repetition number in air and fractures by corrosion fatigue occur. As σ is a function of N alone, and k depends mainly on time t, the condition of fracture may be expressed as σck(t)=σ(N). Various experimental results are well explained by this criterion. This conception is further extended to the corrosion fatigue combining the static pre-corrosion and also changing cycle frequencies during run.
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