Initial Fatigue Crack Growth Behavior in a Notched Component (Report II) : Evaluation of Fatigue Crack in a Notch Field by Elasto-Plastic Fracture Mechanics(Mechanics, Strength & Structural Design)

概要

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In order to characterize the propagation rates of initial cracks in elasto-plastic notch fields by fatigue loads, it is inevitable to apply elasto-plastic fracture mechanics. In the present report, the evaluating method of ΔJ was developed for initial fatigue cracks in elasto-plastic notch field. The interpolation function for calculation of J-integral by Willson was modified for application to notch field. In the estimation of J-integral, stress gradient was considered in the notch field when crack is not present. Fully reversed fatigue tests were carried out on the notched strips of HT80 and A5083-0. The crack closure behavior in the notch field was observed. The approximating formulas were derived to predict crack opening ratio in the notch fields. The fatigue crack growth rates in the notch fields were correlated to ΔJ. As the results, it was cleared that the present ΔJ is applicable to characterize the fatigue crack growth rates in both the elastic and elasto-plastic notch fields. In the end of the report, the phisical meaning of ΔJ was discussed.
大阪大学の論文
1987-06-00