Prediction on Remaining Life of a V-Notched Beam by Measured Modal Frequency

Table 2

Results of fatigue and modal tests.

No. of specimen			Cyclic numbers, N (cycle)	Crack depth, Δa (mm)	1^st modal frequency, f1 (Hz)	2^nd modal frequency, f2 (Hz)
Specimen T1			0	0	62.13	395.7
			163618	1	61.38	394.0
			206946	3	61.19	392.1
			284702	5	59.53	385.8
			313279	7	58.63	385.2
			340612	10	57.19	384.8
			361041	13	54.25	382.7
Specimen T2			0	0	64.72	398.3
			346146	1.5	64.19	396.6
			378657	3	64.06	396.1
			429216	6	62.13	395.4
			460079	8	61.34	394.8
			491275	10	59.59	393.5
			511098	13	56.19	385.8
Specimen T3			0	0	64.69	397.4
			209248	1	64.52	397.1
			308754	3	64.19	396.6
			346445	5.5	64.06	396.1
			375261	7	62.41	395.7
			401518	11	62.13	395.4
			418237	13	61.79	395.1