PSI - Issue 54

Jakub Gorski et al. / Procedia Structural Integrity 54 (2024) 264–270 J. Gorski et al. / Structural Integrity Procedia 00 (2023) 000–000

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Fig. 6. Overview of indices values for undamaged (blue) and damaged (black) beams.

Another noteworthy mechanism is the coupling between the strain field and temperature. During vibration, there is a relative movement of the damaged edge, which induces a frictional phenomenon and a dissipation of excess energy greater than in a material without damage. The paper Klepka et al. (2012) provides experimental evidence of temperature rise in the proximity of the damage resulting from the structural vibration.

5. Summary and conclusions

This paper presents the findings from an experimental investigation of the MT phenomenon and its application in damage localisation. For this purpose, the algorithm for selecting peaks from the signal spectrum and the damage index was employed. The experiments were conducted on both an undamaged and damaged beam. Modal analysis was used to deter mine the frequency and form of the natural vibration, which were applied in the modulation transfer phenomenon experiments. The presented results were related to the modulation transfer phenomenon. The spectra of the recorded signals were revealed, and a graph based on the calculated index values was presented. From the ensuing analysis, the following conclusions were drawn: • MT phenomenon can be used in damage detection and localisation applications. • In addition to the MT phenomenon, other nonlinear e ff ects can simultaneously manifest. Among the presented results, the VAM phenomenon was identified and observed. The findings presented in this study strongly suggest that the MT phenomenon holds great promise for practical implementation in SHM applications.