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Chapter 4 – Methods Figure 4.15: Different cyclic deformational sequences followed to investigate the strain sensing and interfacial stress transfer in the composite coatings. The shift of the 2D band with strain was used to follow the deformation. For deformation studies, all the spectra were obtained using 10 % laser power (< 1 mW, He- Ne laser, 633 nm) with an exposure of 10 seconds and 5 accumulations. The deformation was carried out step-wise in intervals of either 0.02 or 0.05 ± 0.005 % strain. A total of three spectra at each strain level were taken and the average value was used for the calculations. The maximum strain used in these deformation cycles were limited to 0.5 % as the debonding of the flakes and polymer matrix cracking was observed at strains greater than 0.5 % in similar model composites.273 When the maximum strain was achieved in each cycle, the sample was unloaded step-wise to 0 % strain. The composite coatings prepared from LPE graphene were subjected to a deformational loading cycle up to a maximum strain of 0.5 % with 0.05 % strain intervals. 130PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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