The effect of stress history on fatigue crack retardation behaviour

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Abstract
The effect of a decrease in stress range on fatigue crack propagation behaviour in mild-steel plate is investigated. An experimentally determined equation relating the threshold stress intensity factor to stress intensity history is introduced and is seen to be a function of specimen thickness, which determines the crack tip stress—strain state. The delay period between the arrest of a stage II crack and its re-propagation is also a function of stress history and specimen thickness. The effect of increasing the initial high values of stress intensity is to cause the delay period and the threshold stress intensity to increase, both of which are beneficial, i.e. they increase fatigue lifetime.

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