PSI - Issue 12

Venanzio Giannella et al. / Procedia Structural Integrity 12 (2018) 404–415 V. Giannella Structural Integrity Procedia 00 (2018) 000 – 000

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Table 1. Main mechanical and fatigue properties for the considered material.

Young’ s modulus E [GPa]

Poisson ratio υ [-]

Density ρ [kg/m 3 ]

C [MPa^(1-n)/mm^(n/2)]

n [-]

100.1

0.3

4500

3E-14

3.6

2.2. FEM results

Plots of the global-local radial displacements and von Mises stresses are reported in Fig. 2. In particular, Fig. 2d clearly highlights the area with highest stresses where a crack is likely to nucleate and start its growth due to the cyclic loading. Fatigue crack growth has been detected during a full-scale experimental test (Shlyannikov et al., 2001): the modelled crack is shown in Fig. 3a whereas in Fig. 3b some further cracked scenarios are shown.

Figure 2. Global (a) radial displacements [mm] and (b) von Mises stresses [MPa], (c) local von Mises stresses [MPa] with close-up (d) in the surrounding of crack insertion area.