Table 7:
The damping ratios identified by using SSI method from experimental specimens.
—
Undamaged
22.2% delaminated
51.9% delaminated
74.1% delaminated
From random
responses
Frequency (Hz)
31.61
26.83
27.56
24.31
(%)
1.05
1.34
1.68
1.71
From impact
responses
Frequency (Hz)
31.62
26.87
27.44
9.15
(%)
1.25
1.46
1.32
1.43