Abstract
In this study the effect of short and long cracks for brass alloys specimens exposed to bending cyclic load is investigated, this test applied on a group of standard specimens until its fracture, data taken could be drawn as a curve between stress and number of cycles (S-N) curves which gives the fatigue limit. Results obtained theoretically and experimentally, that are concluded decreasing in the applied load cause increasing the age and applying high loads in the beginning and at the end given almost smaller number specimen age and the quick growth of short cracks followed by quick growth of long cracks, that the values taken from the theoretical equations are always greater than experimental number of cycles of failure. Key words: Fatigue, varying loads, short cracks, long cracks, brass alloy.
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