Experimental Nondestructive Test for Estimation of Buckling Load on Unstiffened Cylindrical Shells Using Vibration Correlation Technique

Table 5

Variation of the 1st vibration frequency with the applied load.

R15 cylinder		Z37 cylinder		SST-1 cylinder		SST-2 cylinder
Compressive load [kN]	1st vibration mode [Hz]	Compressive load [kN]	1st vibration mode [Hz]	Compressive load [kN]	1st vibration mode [Hz]	Compressive load [kN]	1st vibration mode [Hz]
0.09	216.75	0	152.5	0	232.75	0	117.5
2.18	212.25	1.2	151.5	4.94	231.75	5.2	116.5
4.16	208	10.2	148.75	10.02	230.5	10.22	115.25
6.16	203.5	20.2	143	20.05	226.5	15.24	113.75
8.2	198.75	30.2	137.25	30.1	222.5	20.24	112.5
10.55	193.5	40.2	130.75	40.04	218.5	24.97	110
12.77	188.25	50.2	123.25	50.2	213.5	30.24	109.75
15	182.75	55.2	119	55.07	211	35.23	107.25
17.57	175.5	58.2	115.5	60.25	208	40.22	106.5
19.42	170					45.23	102.5
20.63	166.25
22.4	159.75