Evident from the above graph, the elastic stiffness was almost the same for all TEPs percentage weight and also, the maximum load increased by addition of TEPs. An increase in displacement can also be observed for all the wt% TEPs concentrations.
The critical fracture energy in mode I, GIc , was evaluated using the Compliance-Based Beam Method (CBBM)which has the following  mathematical expression:
                                                                                                                \(G_{Ic}\ =\ \frac{6P^2}{b^2h}\left(\frac{2a_{eq}^2}{h^2E_f}+\frac{1}{5G}\right)\)