PSI - Issue 47

Francesco Ascione et al. / Procedia Structural Integrity 47 (2023) 826–841 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 9. Maximum load vs limit shear stress curves varying the fracture energy.

Regarding the influence of the material adhesive parameters, in Figure 10 the P- δ curves of a ENF test are build varying the limit shear stress (Figure 10a) and the adhesive fracture energy (Figure 10b). It is worth noting how the shear stress parameter governs the shape of the curve (Figure 10a) passing form a ductile behaviour for law values of � to an elastic behaviour for high values of it with a consequent increase of the maximum load in accordance with the results presented in Figure 9. The adhesive fracture energy influences the maximum load only (Figure 10b). Similar conclusions were presented in [Xu et al 2012].

Fig. 10. Numerical P- δ curves (E = 24000 MPa): a) influence of � ( �� , � = 2 N/mm); b) influence of �� , � ( τ =10 MPa). Regarding the influence of the GFRP material parameter, in Figure 11 the P- δ curves of a ENF test, varying the Young modulus of the adherents, are depicted. It is possible to conclude that the higher the Young Modulus is, the higher the stiffness is.