PSI - Issue 80

Yuhang Pan et al. / Procedia Structural Integrity 80 (2026) 43–52

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YuhangPan / Structural Integrity Procedia 00 (2023) 000–000

Fig. 6: Crack detection results for specimen T6 under a stress range of 9-90 MPa and a loading frequency of 6 Hz: (a) Variation of the RMS values with respect to the number of fatigue loading cycles; (b) Running details of the DPL method; (c) Slope values calculated using the DPL method, with the threshold set to 1 . 0 × 10 − 3 ; (d) The di ff erent fatigue stages divided by the DPL method, and the crack length detected by the method. The detectable crack length is 0.7 mm, and the corresponding number of cycles is 92 k.

Fig. 7: Crack detection results for (a) specimen T2 and (b) specimen T3 under a stress range of 1.8-18KN and a loading frequency of 6 Hz.

the data acquired from Sensor 2. The results obtained by applying the DPL method to Sensor 2 are presented inFig. 8.