PSI - Issue 18

V. Dattoma et al. / Procedia Structural Integrity 18 (2019) 719–730 Author name / Structural Integrity Procedia 00 (2019) 000–000

727

9

around to a load equal to 9919 N and an axial displacement equal to 1,46 mm. Increasing the strength of the lamina of the 40% it can be observed as for equal displacement the load results much lower and causing going an evident delay of the settlement for damage processes. This last result is due to a minor rotation of the rivet.

(a)

(b) (c) Fig. 10. (a) distribution of stress σ X on the entire model A; (b) σ X laminate distribution in the hole. (c)Shear stress (XY plane)).

(a) (b) Fig. 11. (a) Comparison of the damage varying the properties degradation of material; (b) Comparison of the damage varying the compressive stress limits in y -z direction. 4.4. Model B – Plies Failure Modes Various Modes failure were analysed for a load equal to 8726 N that in this work it is assumed to be the start of the macroscopic damage. At this load level the damage appears extensive which means that locally some less extensive damage started earlier.