抄録
Generally, crack shape which exists in a three-dimensional structure, can be approximated as part of an elliptical crack. High precision evaluations of the stress intensity factor are necessary for the prediction of growth, and unstable fracture of the crack, in such a structure. However, it is difficult to obtain the high precision stress intensity factor if element subdivision is not made fine. This, in the singularity vicinity; such as a crack front. In general, numerical methods for analysis, use such as the Finite Element Method or Boundary Element Method. Also, using general numerical method for analysis, the calculation time becomes very large, to analyze interference problem of the crack group, requiring complicated element subdivision. By using Finite Element-Alternating Method, it is possible to obtain the solution with good accuracy and without completely modeling the crack.In this study, we evaluated by this method, the interference degree between a surface crack and the oil hole in the crank shaft.
