Impact Dynamic Properties and Energy Evolution of Damaged Sandstone Based on Cyclic Loading Threshold

Table 2

Energy statistics of sandstones with different degrees of damage under impact load.

Cyclic load threshold	Specimen size (mm)		σd (MPa)	Average of σd (MPa)	(J)	(J)	(J)	(J·cm^−3)	Average of (J·cm^−3)
	Diameter	Height
0	49.75	24.68	69.98	72.33	108.64	11.75	40.38	1.1779	1.1779
	50.04	25.61	72.83		106.43	14.27	33.63	1.1621
	49.84	26.06	74.17		107.52	11.96	37.49	1.1422
0.2	49.92	24.76	68.89	70.37	106.68	12.26	46.56	0.9876	0.9876
	49.95	25.09	71.57		108.47	10.88	48.67	0.9950
	50.02	25.11	70.56		106.82	10.37	47.24	0.9973
0.4	49.94	24.64	66.69	65.80	101.06	8.02	47.67	0.9400	0.9400
	49.88	25.12	67.91		104.90	7.55	50.37	0.9571
	50.04	24.94	62.81		101.98	7.67	48.74	0.9290
0.6	50.04	25.05	48.37	51.97	110.24	4.87	68.84	0.7415	0.7415
	49.96	24.85	54.15		103.65	5.23	61.21	0.7638
	49.97	26.12	53.39		100.66	4.35	58.11	0.7457
0.8	50.01	25.13	29.89	29.48	103.73	2.29	69.53	0.6464	0.6464
	49.95	26.22	31.47		108.47	2.75	70.88	0.6780
	49.95	24.06	27.09		108.84	3.32	75.94	0.6274