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The validity of numerical fatigue crack growth simulation models based on the Dugdale strip yield model is investigated. Newman’s and authors’ models are highlighted. The differences of each model are... explained and the comparative study of models with the object of crack opening load is conducted. The crack opening load by authors’ model gives an reasonable value compared to Newman’s model, because Newman’s model ignores the elastic deformation in the plastic region and cannot represent the effect of re-distribution of stresses during the cyclic loading. Besides, the availability of redefined effective stress intensity factor for the fatigue crack propagation by replacing the crack opening load with the RPG load is confirmed.続きを見る
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