PSI - Issue 8

Francesca Curà et al. / Procedia Structural Integrity 8 (2018) 204–211 Author name / StructuralIntegrity Procedia 00 (2017) 000 – 000

209

6

1/10.7 1/10.5

1/3000 1/3000

14.34 14.97

Fig. 5. Example of numerical results: contact pressure distribution on the shaft (left) and on the hub (right).

Fig. 6. Example of numerical results: relative tangent displacement along x direction (left) and y direction (right).

Table 4. FE results: values of slidings. Model Torque [Nm] ρ 1max [mm -1 ]

ρ 1min [mm -1 ] 1/3000 1/3000 1/3000 1/3000 1/4000 1/4000

Slidings x axis [mm]

Sliddings y axis [mm]

Slidings magnitude [mm]

m1 m2 m3 m4 m5 m6

500 500 500 700 700 700

1/11.3 1/10.5 1/10.7 1/10.9 1/10.7 1/10.9

0.00321 0.00660 0.00391 0.00907 0.00901 0.00886

-0.00067 -0.00037 -0.00035 -0.00048 -0.00048 -0.00051

0.00328 0.00661 0.00393 0.00908 0.00902 0.00887

Figure 6 represents an example of relative tangent displacement values, involved in torque application in aligned conditions. All FE results in terms of slidings are resumed in Table 4. Figure 7 reports FE results for the case of applied torque (700 Nm) in misaligned conditions (10’). Finally, Figure 8 shows two images related to the preliminary tests (torque 700 Nm) performed in aligned conditions (standard fatigue machine) and in misali gned ones (10’) (dedicated test rig), run both for 1x10 6 cycles. The damaged zone is well emphasized and its elliptical shape satisfying represents the realized microgeometries.