Energy and Fatigue Damage Evolution of Sandstone under Different Cyclic Loading Frequencies

Table 3

Cyclic loading test results.

Specimen	σmax (MPa)	σmin (MPa)	f (Hz)	Failure strength (MPa)	Cycle number
CF1-1	45	25	0.5	45	869
CF1-2	45	25		45	821
CF1-3	45	25		45	897
CF2-1	45	25	1.0	—	2000
CF2-2	45	25		—	2000
CF2-3	45	25		—	2000
CF3-1	45	25	2.0	—	2000
CF3-2	45	25		—	2000
CF3-3	45	25		—	2000