Abstract
We describe the procedure of diagnostics of the initiation and stable propagation of fatigue fracture in alloy of the Al–Zn–Mg–Cu system based on the specific features of generation of the acoustic emission in the process of initiation and growth of fatigue cracks in 1973-T2 aluminum alloy. It is shown that the character of emission of the AE signals depends on the microstructure and mechanical properties of the alloy and that the area of newly formed defects is proportional to the sum of the amplitudes of recorded signals. It is established that the transition from the stage of initiation to the stage of stable propagation of fatigue fracture is accompanied by an abrupt jump of the AE activity.
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