Abstract
In order to understand the mechanism of fatigue crack propagation in steels with different yield strength, the amount of slip at the crack tip was measured under the monotonic and cyclic loading conditions by the step loading method. The results show that the amount of slip at the crack tip is in accordance with that predicted from the theory obtained under monotonic loading conditions. However the amount of slip at the crack tip under cyclic loading conditions is very small and is nearly equal to the amount of crack growth in one cycle of the loading process. This sudden decrease in the amount of slip at the crack tip under the cyclic loading condition can be explained by assuming the existence of a thin ideal strength phase near the crack tip.
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