Abstract
Crack closure characteristics in fatigue crack growth were examined using the modified Dugdale model developed by Newman. The model can leave elastic-plastic asperities in the wake of the growing crack tip. The analysis shows the influence of the rigidity, E, of the asperities, asperity length, asperity thickness and the distance from the crack tip. The results are compared with the experiments. It is noted that the experimentally detected closure level can't give correct informations regarding actual one under some conditions. Especially, under corrosive environment, the crack closuer level is overestimated than the actual level. On the other hand, near threshold region in air environment, it is underestimated.
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