Abstract
In the present study the effect of overstress on a non-propagating crak is investigated on the specimens with a small hole (dia. : 100μm, depth : 100μm). The effect of overstress on the behavior of the non-propagating crack under the first stress level is larger in this type of specimen than in the plain specimen. This phenomenon is closely related to the length of a non-propagating crack formed under the first stress level. This experimental result suggests that the existence of defects is more dangerous under varying stress amplitude than under constant stress amplitude. Moreover, the crack closure behaviors before and after overstress were measured by the S shaped unloading curve method in order to explain the effect of overstress.
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