PSI - Issue 50

M.M. Kopyrin et al. / Procedia Structural Integrity 50 (2023) 137–146 M. M. Kopyrin et al. / Structural Integrity Procedia 00 (2019) 000 – 000

143

7

On the surface of the adhesive failure of rubber/fiber, the spectra corresponding to fibrous tissues are observed. Thus, peaks at 905 cm -1 and 690 cm -1 corresponding to [SiO 4 ] 4 – vibrations were recorded on the surface of the SKD V BF material, referring to Lee et al. (2015) (Fig. 8 a ). The presence of these peaks (905 cm -1 and 690 cm -1 ) was also recorded on the destruction surface of the SKD-V GF (Fig. 8 b ), in addition, absorption bands were found in the region of 2500-1500 cm -1 , which characterize the stretching vibrations C=C, and a peak at 1400 cm -1 corresponding to calcium carbonate, which correlates with the work of the authors Legodi M. A. et al. (2001). The IR spectrum of SKD-V CF (Fig. 8 c ) also exhibits peaks in the region of 2500 – 1500 cm -1 , which are characteristic of C=C stretching vibrations. Figure 9 shows a thermogram of an elastomeric matrix based on SKD-V rubber.

Fig. 9. DSC thermogram of SKD-V rubber

The DSC thermogram shows that the transition of the elastomer from the elastic state to the glassy state begins at a temperature of - 79.4°C and ends at - 84.7° C. As established by Zolotarev et al. (2020) and Dias et al. (2019), elastomers based on butadiene rubbers characterized by a low glass transition temperature due to the high mobility of rubber molecules and are used in the production of frost-resistant elastomers. Fig.10 shows the thermomechanical analysis (TMA) curves for an elastomeric matrix and elastomers reinforced with basalt, glass, and carbon fibers.

-7

-

Fig. 10. TMA plots of original rubber and fiber-reinforced composite elastomers