This paper discusses the types of discontinuities formed during production and operation in parts made of polymer composite materials (PCMs) and multilayer structures, which are classified into seven different groups according to their hazard. Quantitative and qualitative indicators of the discontinuities are provided and reasons for their formation are specified. Discontinuities in PCMs differ based on their origin (whether they occur during the manufacturing, storage, transportation, or operation stage), location in the part (on the surface, within the volume, or appearing on the edge of the part), occurrence depth, opening, plane size of the given structural heterogeneity (macrodefects larger than 60 to 100 μm are usually localized in the volume of the structure, and microdefects, which can be up to 60 to 100 μm in size, are usually distributed within the volume of the material or a significant part thereof). Various nondestructive testing (NDT) methods for detecting the discontinuities are also considered.
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