PSI - Issue 61

Rachid Azzi et al. / Procedia Structural Integrity 61 (2024) 241–251 Rachid Azzi and Farid Asma / Structural Integrity Procedia 00 (2023) 000 – 000

248

8

b

c

a

Fig. 12. Mode shapes of damaged propeller blade in a rotating frame. (a) First mode, (b) Second mode, (c) Fourth mode.

3.3. Dynamic analysis of propeller blade In this section, a dynamic analysis is conducted under the Ansys workbench for the healthy and damaged blades to investigate the effects of damage length, damage position, and the geometrical damage shapes in the dynamical response of the propeller blade. The propeller blade is constrained at its base and an impulsive force is applied at the blade tip as shown in Fig. The numerical damping is assumed equal to 0.1. The impulse force which the magnitude is tabulated in Table 2 was applied to the blade tip in the y-axis during t=0.03E-5 s. The time response expressed by the displacement of the blade tip in the y-direction was computed for each model of the blade during 6.91 E-3 s.

Fig. 13. Geometrical healthy propeller blade with boundary condition and load.

Table 2. The impulsive force magnitude Etapes Temps [s]

X [N]

Y [N]

Z [N]

1 1 1 1 1

0

0 0 0 0 0

0

0 0 0 0 0

3,44E-05 3,47E-05 6,91E-05 6,91E-03

100 100

0 0

Figs. 14, 15, and 16 shows the displacement of the healthy blade and those of the damaged blade as a function of time for different damage lengths and for damage positions S5, S8, and S17 respectively.