The corrosion fatigue behaviour of eutectoid steel rods has been studied in air and in an environment consisting of 1g I−1 Ca(OH)2 +1g l−1 NaCL solution. It was observed that the fatigue crack growth rate (da/dN) was faster in this environment than in air. da/dN at 0·1 Hz was found to be lower than that at 1Hz in the same environment. This behaviour is explained in terms of crack closure. Thus, it is suggested that crack closure is taking place in this material at 0·1 Hz in the experimental environment. A model developed previously to predict fatigue lives of unnotched specimens from the sizes of the initiating flaws gave good agreement with the experimental results.
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