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

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These results concern the “V” geometrical damage form. It is seen that the response of damaged blades is completely different from that of an intact blade in amplitude and phase. The amplitude of the dynamic response of the damaged blades is higher than that of an intact blade. On the other hand, it is seen that when the damage length increases the amplitude of displacement of the blade tip increases by some thousandth millimeters. For damage positions near the blade root S5 and S8 (Fig. 14 and Fig. 15), it is easy to assess the damage length from the dynamic response of the damaged blade. However, for the case of damages near the blade tip “S17”, it is difficult to assess the damage length, see Fig. 16.

L=1mm, S5,V L=3mm, S5, V L=5mm,S5, V Intacte

0,03

Detail in interval [0.00194-0.00204 s]

0,0215

0,02

L=1mm, S5,V L=3mm, S5, V L=5mm,S5, V

0,021

0,01

0

0,0205

-0,01

0,02

-0,02 Displacement in Y- direction (mm)

0,0195

Displacement in Y - direction (mm)

-0,03

0,019

0 0,001 0,002 0,003 0,004 0,005 0,006 0,007

0,00194 0,00196 0,00198

0,002

0,00202 0,00204

Times (S)

Times (S)

Fig. 14. Tip displacement with time for damaged and undamaged blade for different damage lengths, S5.

L=1mm, S8,V L=3mm, S8, V L=5mm,S8, V Intacte

0,03

Detail in interval [0.00194-0.00204 s]

0,0215

0,02

L=1mm, S8,V L=3mm, S8, V L=5mm,S8, V

0,021

0,01

0,0205

0

0,02

-0,01

-0,02 Displacement in Y- direction (mm)

0,0195

Displacement in Y - direction (mm)

-0,03

0,019

0 0,001 0,002 0,003 0,004 0,005 0,006 0,007

0,00194 0,00196 0,00198

0,002

0,00202 0,00204

Times (S)

Times (S)

Fig. 15. Tip displacement with time for damaged and undamaged blade for different damage lengths, S8

L=1mm, S17, V L=3mm, S17, V L=5mm, S17, V Intacte

0,03

Detail in interval [0.00194-0.00204 s]

0,0215

0,02

L=1mm, S17, V L=3mm, S17, V L=5mm, S17, V

0,021

0,01

0

0,0205

-0,01

0,02

-0,02 Displacement in Y -direction (mm)

0,0195

Displacement in Y - direction (mm)

-0,03

0,019

0 0,001 0,002 0,003 0,004 0,005 0,006 0,007

0,00194 0,00196 0,00198

0,002

0,00202 0,00204

Time (S)

Time (S)

Fig. 16. Tip blade displacement with time for damaged and undamaged blade for different damage lengths, S17