Research Article
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 |
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