Experimental Study on Dynamic Mechanical Characteristics and Energy Evolution of Sandstone under Cyclic Impact Loading

Table 2

Experimental results of sandstone under cyclic impact loads.

No.	L0 (mm)	D0 (mm)	ρ (kg/m^3)	n	(m/s)	(m/s)	σ^f	ε^f	έ/s^−1
s0-2	100.04	100.68	2394.799	0	—	2950	—	—	—
				1	5.998	2717	79.78	0.0054	13.58
				2	—	2667	76.55	0.0053	13.41
				3	6.035	2587	75.29	0.0058	14.65
				4	6.008	2584	75.07	0.0053	13.03
				5	5.957	2541	70.23	0.0053	13.19
				6	5.911	2481	70.81	0.0056	13.99
				7	—	2448	64.58	0.0059	14.72
				8	5.710	2427	61.11	0.0060	15.06
s0-1	100.13	100.66	2404.942	0	—	2886	—	—	—
				1	—	2699	91.61	0.0057	15.21
				2	—	2625	89.49	0.0067	17.10
				3	6.742	2551	87.64	0.0065	17.85
				4	7.080	2466	82.60	0.0068	16.89
				5	6.885	2375	76.31	0.0064	16.99
				6	7.290	—	69.45	0.0093	23.37
s0-6	99.97	100.89	2387.611	0	—	2946	—	—	—
				1	—	2688	121.62	0.0060	14.10
				2	—	—	106.33	0.0067	19.25

Notes: L₀ is the sample length; D₀ is the sample diameter; ρ is the sample density; P_v is the impact air pressure; n is the impact numbers; is the measured impact velocity; σ^f is the peak stress; ε^f is the peak strain; έ is the average strain rate.