703 有限要素法を用いた残留応力場における三次元斜め疲労き裂の伝ぱシミュレーションおよびその実験的検証

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The present authors proposed a method for predicting fatigue lives of a two-dimensional crack propagation in residual stress fields, by using crack propagation behavior expressed in terms of effective stress intensity range, and effective range ratio U expressed in terms of stress ratio. Extensions of the method to three-dimensional cracks have been made. In this paper, the method was applied to three-dimensional slant cracks, slant hole-corner cracks and slant corner crack propagating toward a hole using the finite element method. The amount and direction of crack extension were evaluated at each point of the crack front to simulate complex shape changes in the three-dimensional cracks. The effects of contact restraining stresses were examined based on predictions using the finite element simulations and their comparison with experiments.
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