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Chapter 4 – Methods where, 𝜔 is the Raman wave number (cm-1), 𝜔𝑐 at the centre, 𝐼0 is the maximum intensity and ∆𝜔 the full width at half maximum of the peak. 333, 345, 346 The Raman system was calibrated using a standard silicon sample which has a characteristic peak at 520 cm-1. 4.3.9.2. Deformational procedure For the deformational analysis, a resistance strain gauge (Vishay Precision Group, Inc.) was fixed on all the composite coating samples on the PMMA beam using a cyanoacrylate adhesive. Electrical wires were soldered to the strain gauge and connected to a multimeter to measure the change in resistance during the deformation. The tensile strain on the sample top surface was introduced by using a four-point bending rig as shown in Figure 4.14. Figure 4.14: a) Schematic representation and b) Picture of the four-point bending rig with PMMA beam showing tensile loading on the top surface It is to be noted that, the strain on the thin composite sample was assumed to be same as that of beam surface. The resistance of the strain gauge changes corresponding to the strain applied on the beam. Hence, using the following equation value of applied strain on the sample surface could be calculated: ɛ𝑚 = 𝑅𝑆𝑖−𝑅𝑆0 × 100% Equation 4.9 𝑆𝑔𝑓×𝑅𝑆0 Where, 𝜀𝑚 is matrix surface strain, 𝑅𝑆𝑖 is strain gauge resistance with loading, 𝑅𝑆0 is strain gauge resistance without loading and 𝑆𝑔𝑓 is gauge factor of strain gauge (2.080 ± 0.5 from Vishay). In order to investigate the strain sensing and interfacial stress transfer, composite coatings were subjected to cyclic deformation. Different deformational sequences were followed (Figure 4.15): 128PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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