Issue 68

E. M. Strungar et alii, Frattura ed Integrità Strutturale, 68 (2024) 63-76; DOI: 10.3221/IGF-ESIS.68.04

Figure 7: Time dependence diagrams of the cumulative energy of AE signals together with the loading diagrams.

Figure 8: Histogram of the frequency distribution of the spectral maximum.

The peak frequencies of AE signals were also analyzed. Histograms of the frequency distribution of the spectral maximum frequencies of the signals were plotted (Fig. 8). Three frequency ranges can be distinguished from the data for all specimens: 100-310 kHz, 350-550 kHz, 700-900 kHz. Since during the preliminary calibration of the system it was found out that the

70