Prediction of Fatigue Crack Path by Finite Element Method

概要

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An attempt is made to predict the fatigue crack path in combined mode I and mode II, using the finite element method, with the purpose of serving for an optimum design of a structure against fatigue failures. Most crack analyses up to now have treated the problem of a straight extending crack. But cracks found in structures more or less deviate or extend in a zigzag manner due to the mixed mode stress state produced, for example, by neighbouring flaws or combined mode loadings. Especially in a high cycle fatigue where crack growth rate is quite slow, the change in stress state caused by the deviation of a crack affect the succeeding crack path and crack growth rate. Therefore, the prediction of a crack path is important from the standpoint of fatigue life evaluation as well. The adoption of the finite element method enabled the successive pursuit of deflecting crack extension. The predicted fatigue crack path emanating from an oblique crack agrees well with the experimental result.
大阪大学の論文