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Q. Like et alii, Frattura ed Integrità Strutturale, 34 (2015) 543-553; DOI: 10.3221/IGF-ESIS.34.60 547 Figure 3 : Stress-strain curve with strain-softening model. Density (kg/m 3 ) Bulk modulus (GPa) Shear modulus (GPa) Peak strength (after 1% strain) Residual strength(after 1% strain) φ (°C) c(MPa) T(MPa) φ r (°C) c r (MPa) T r (MPa) Calcite 2680 73.3 32.0 54 25 15 54 0.1 0 Galena 7597 58.6 31.9 54 25 15 54 0.1 0 Table 3 : Mechanical parameters of the mineral [21, 25]. C ALCULATION RESULTS AND ANALYSIS he major factors that influence microwave-assisted mineral liberation include microwave power density, irradiation time, mineral content, and mineral crystal size. Mineral content pertains to the volume content, which is the ratio of the volume of mineral to that of total rock. To facilitate the comparison of the effects of different sizes of mineral crystals on mineral liberation, the size of crystals in the mineral herein is assumed to be similar. (a) t=5ms (b) t=15ms (c) t=20ms (d) t=25ms Figure 4 : Distribution diagram of rock failure state (P d =10 9 W/m 3 ). T