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The AE signal mean values characteristic parameters range at different fatigue damage stages.
| AE parameters | Fatigue source crack initiation | Fatigue crack propagation | Fatigue fracture |
|---|---|---|---|
| Amplitude (dB) | 55 | 75 | 90 |
| Energy (mv.s) | 125 | 245 | 482 |
| Count | 157 | 263 | 507 |
| Rise time (μs) | 373 | 605 | 1,120 |
| Duration (μs) | 3,221 | 3,576 | 661 |
