Experimental Research on Vibration Fatigue of CFRP and Its Influence Factors Based on Vibration Testing

Table 7

The test result of Group D&E.

Specimen	Resonant frequency
	Initial value (Hz)	Ultimate value (Hz)	Reduction (Hz)	The time of the last decrease (min)
D1	8.1482	7.8735	0.2747	166.75
D2	7.9651	7.6904	0.2747	150.38
D3	7.6904	7.4158	0.2746	137.27
E1	8.0566	7.7820	0.2746	171.83
E2	7.5989	7.2327	0.3662	144.35
E3	7.6904	7.2327	0.4577	140.17