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In the present study the crack propagation behavior under constant amplitude loads emerging from the notch root after being overloaded and held in a certain period of time was investigated. When the stress ratio of constant amplitude load is zero, the longer period of hold time of the overload increases the number of delay cycles and decelerates the crack propagation emerging from the notch root. However, the number of delay cycles is reduced by the increasing of the hold time period, and the acceleration of the crack propagation was observed immediately after emerging from the notch root when the stress ratio is -1.5. The magnitude and the period of the hold time of the overload as well as the stress ratio of the constant amplitude load condition following the overload are responsible for the residual stress state in front of the notch root affecting the crack propagation behavior.

The effect of hold time of overload on crack propagation behavior emerging from notch root