Abstract
In this study, the effect of the block overload duration on the two-dimensional crack propagation life was experimentally investigated. In the experiments, different sizes of overload cycles were applied on Compact Tension (CT) specimens machined from rolled Al-7075-T6 plates. The experiments showed that if applied block overload cycles are extended, the crack growth accelerates, because the overload cycles dominate the crack growth. In the short cycle block overload case, crack propagates slower than the case of single overload due to the plasticity-induced effect in the crack tip. After the tests, crack growth life was calculated using some models in the literature, and the results were compared with the experiments. Close results to the experiments were obtained with Wheeler model and its modifications.
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