Experiments on the fracture testing of reinforcing fibers of composite materials and specimens of unidirectional laminates were performed using acoustic-emission diagnostics. The results were used to establish the correspondence between the fractures in the structure of polymer composite materials (PCMs) at the micro-, meso-, and macroscale levels and the acoustic emission (AE) pulses recorded in this process and their energy and temporal parameters. The establishment of such phenomenological dependences makes it possible to carry out selection of the registered AE pulses, combining them into energy clusters of the lower (L), medium (M), and upper (U) levels, which correspond to micro-, meso-, and macroscale fractures, respectively, in the composite-material structure. By controlling the redistribution of the weight content of AE pulses (W-i) in the energy clusters, whose total level is W-L + W-M + W-U = 100, in the product loading process, the damage accumulation in the structure of the PCM package at different scale levels is monitored by evaluating the residual structural strength via comparison of the current values of the parameters W-i with the thresholds W-i that are registered upon material failure.
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