Mechanical Behavior and Damage Evolution for Granite Subjected to Cyclic Loading

Table 1

Energy and damage for the samples under different confining pressures.

σ3 (MPa)	Number of cycles (n)	Upper limit of stress (MPa)	Total input energy (J·m^−3)	Elastic strain energy (J·m^−3)	Dissipated energy (J·m^−3)	Damage value
0	1	21.60	7.66	6.65	1.01	0.0045
	2	42.20	23.98	20.33	3.65	0.0160
	3	63.26	44.32	39.39	4.93	0.0208
	4	84.32	73.41	62.03	11.38	0.0512
	5	105.46	106.85	92.11	14.74	0.0664
	6	133.38	186.40	—	186.40	0.8392
15	1	38.81	17.09	15.07	2.02	0.0031
	2	76.77	56.43	48.87	7.56	0.0115
	3	115.16	108.09	96.30	11.79	0.0179
	4	153.62	190.71	171.70	19.01	0.0289
	5	191.79	285.92	260.67	25.25	0.0384
	6	257.53	592.69	—	592.69	0.9003
25	1	43.77	22.00	19.01	2.99	0.0030
	2	86.46	66.55	58.09	8.46	0.0085
	3	129.75	134.11	122.42	11.69	0.0118
	4	173.00	235.10	216.56	18.54	0.0187
	5	216.19	346.30	318.83	27.47	0.0277
	6	317.06	923.50	—	923.50	0.9394
35	1	51.81	28.66	24.79	3.87	0.0034
	2	102.77	91.79	80.46	11.33	0.0101
	3	154.19	189.20	171.72	17.48	0.0156
	4	205.58	311.16	291.07	20.89	0.0180
	5	256.97	485.73	445.22	40.51	0.0362
	6	341.85	1024.01	—	1024.01	0.9165