The effectiveness of using acoustic emission diagnostics in conjunction with vibration diagnostics and video recording to assess the load-bearing capacity of a composite sample, as well as to identify the mechanisms of the evolution of its destruction under compression, has been studied. Before the compression test, a sample made of multilayer high-strength carbon fiber plastic was subjected to impact action with an energy of 90 J in the central part. Before the occurrence of developing macrodamages in the structure of the material, the amplitude spectra recorded during vibration diagnostics remained practically constant. The picture changed sharply with the emergence and development of macrodamages, which was reflected by the scalogram of the recorded vibration signal emissions at the characteristic stages of the evolution of the destruction of laminated carbon fiber reinforced plastic. The dynamics of changes in the peak frequencies of local maxima of the amplitude spectra of vibration signals generated by the processes of collapse of the ends of the sample, its delamination, local buckling during deflection, and breakage of layers with increasing compressive load until the load-bearing capacity of the carbon fiber plastic is lost has been studied. The use of vibration diagnostics in conjunction with video recording made it possible not only to verify the results of acoustic emission diagnostics to assess the level of load-bearing capacity of layered carbon fiber reinforced plastic, but also to monitor the kinetics of macro-damage in its structure.
N. A. Makhutov (2025) studied this question.