What is meant by the fatigue strength of aluminum?
Fatigue is the process in which a repeated cyclic stress, most often below the yield strength of the material, can result in damage and subsequent failure. The fatigue strength of an aluminum alloy and temper is the stress below which the material will survive a certain number of cycles, with the later expressed on a log scale. Sometimes the “fatigue endurance limit” is listed, and this is defined as the stress level at 500,000,000 cycles of fully reversed loading.