Abstract: The fatigue crack growth under mixed-mode loading was simulated using finite element
method (FEM). The stress intensity factors (SIFs) have been calculated by the linear
elastic fracture mechanics approach (LEFM) using fracture analysis code-2D (Franc2D).
Due to the symmetrical stress distribution around the crack tip in biaxial stressed
specimen, the crack growth under opening mode-I was considered. The crack growth
occurs mainly along the direction where the mode-I stress component becomes the
maximum. Therefore, KI was used only in the numerical integration of the fatigue life
equation. It was found that the fatigue crack growth was faster at a smaller λ, i.e., higher
σy on the horizontal crack plan. Moreover, fatigue strength (FAT) values decrease as λ
increasing. Finally, it was shown that FAT under λ can be predicted using the SIF and the
concept of LEFM. |
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