Bending stress is calculated of the composites tested according to the Eq. (5.4): σ ¼ 3Pl 2bh2 ð 5:4Þ In this formula, l is the span length, P is the maximal bending load, b and h are the sample width and thickness, respectively. An alteration was observed in the bending strength of specimens by the change of the mass rate of graphene amount which can be seen from Fig. 5.13. However, from the values this situation cannot be generalized. The most probable reason for this is thought as non-homogeneous distribution of GNPS. Fig. 5.7 (a) Indentation modulus (b) Stress exponent diagrams for specimens ERG I-II-III under 20 and 50 mN 5 Mechanical Characterization of Epoxy – Scrap Rubber Based Composites Reinforced with Nano Graphene 53
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