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- W2023990056 abstract "High resolution synchrotron X-ray tomography has been used to obtain three-dimensional (3D) images of the early stages of fatigue crack nucleation in a nodular cast iron. Microcracks were observed to initiate at casting defects (microshrinkage) and graphite nodules. The 3D observations have shown that the microcracks form in the material ligament comprised between the specimen surface and the defect. The probability of a defect to initiate a crack was correlated with the size of the defect and its position with respect to the surface. This correlation has been explained on the basis of local stress concentrations in the vicinity of the defect. The 3D observations of samples submitted to different fatigue cycles revealed that a large part of the fatigue life consisted in the progressive fracture of the ligament. The majority of the observed cracks stopped after this fracture process and, therefore, their size did not exceed the initiating defect size even if the crack seemed larger than the defect on the optical surface observations. Only few microcracks, nucleated on the largest defects, continued to grow with short-crack behaviour." @default.
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- W2023990056 date "2008-06-01" @default.
- W2023990056 modified "2023-10-16" @default.
- W2023990056 title "Three-dimensional shape of the early stages of fatigue cracks nucleated in nodular cast iron" @default.
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- W2023990056 doi "https://doi.org/10.1016/j.msea.2006.09.178" @default.
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