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/m3)
n
(m/s)
(m/s)
σf
εf
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; Pv is the impact air pressure; n is the impact numbers; is the measured impact velocity; σf is the peak stress; εf is the peak strain; έ is the average strain rate.