PSI - Issue 75

23

Fabrice Deleau et al. / Procedia Structural Integrity 75 (2025) 392–418 Emmanuel Persent, Deleau Fabrice, Guillaume Coudouel, Guillaume Perrin/ Structural Integrity Procedia (2025)

414

Approx. 1 656 000 cycles

Fig. 21: Activity recorded on small-sized i-Clip 987 - 1,652,312 to 1,752,307 cycles - Left: Energy versus time with cracking filter - Right: Energy versus time This EA activity continues periodically - the “acoustic wave” phenomenon observed in previous tests - throughout the rest of the cycle, alternating between the two lugs (Fig. 22).

Fig. 22: Activity recorded on small-sized i-Clip 987 - 1,923,564 to 1,941,384 cycles - Left: Energy versus time with cracking filter - Right: Energy versus time EA activity increases significantly again at around 2,050,000 cycles (Fig. 23). Beyond this point, the energy of the bursts identified as cracking phenomena increases by a factor of 10 to 100 to approach 10 4 - 10 5 eu.

2 050 000 cycles

Fig. 23:Activity recorded on small-sized i-Clip 987 - 2,040,000 to 2,147,000 cycles - Left: Energy vs. time with cracking filter - Right: Energy vs. time This phenomenon is observed on both lugs alternately right up to the end of the test, though much more strongly on lug No 1.(Fig. 24)