Digital imaging of crack evolution in granite containing unparallel flaws under fatigue loading.

In contrast, for S135 and S180 geometries, the strength showed a decreasing trend, reaching its lowest point of 123 MPa in the S180 geometry.

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While it showed the lowest strength under static loading, its fatigue performance under cyclic loading displayed an unexpected trend: initial decrease from 425 cycles (at 75%) to 257 cycles (at 80%), followed by an increase to 310 cycles at 85% amplitude.

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