Issue 51

G.S. Serovaev et alii, Frattura ed Integrità Strutturale, 51 (2020) 225-235; DOI: 10.3221/IGF-ESIS.51.18 232 obtain a clear image on a number of samples. However, on this type of surface different constituents of the composite material have more clearly distinguishable boundaries. The analysis of the obtained images shows that on the GFRP samples such structural elements of the composite material with a woven reinforcement type as the warp and weft fibers and areas filled with resin are clearly identifiable (Fig. 12). Figure 12 : Image of the internal structure of GFRP sample with woven reinforcement scheme and embedded optical fiber. Figure 13 : Images of the internal structure of a CFRP samples with embedded optical fiber and different surface treatments: not polished (upper row), polished (lower row).