Abstract
Low cycle fatigue tests were conducted by tension-tension until rupture, on an Alclad 7075-T6 aluminum sheet alloy. Extremal peak Acoustic Emission amplitudes were continuously monitored. They were shown to be extremally distributed. The prediction of the number of cycles left until failure is made possible, and improved within a fair practical interval and at a good confidence level, very early in the fatigue damage accumulation process. It has been shown that only a few percent of the elastic energy associated with the crack propagation phenomena is converted into detectable acoustic energy.
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