13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- morphology. The failure pattern of the specimen is shown in Figure 5. The critical fracture loads under different temperature are shown in Table 2. The relative variation rate η which was compared with the critical fracture load under ambient temperature, the values of η v.s. temperature are listed in Tab. 3. η is defined as: η=(F-F0)/F0 (1) F0 and F are the critical fracture load under ambient temperature level and other temperature levels. η can reflect the deviation extent between F and F0 under different temperature. Figure 3 Uniaxial compression test Figure 4 Abnormal three point bending experiment Table 2 The critical fracture load F v.s. temperature The critical fracture load F/（kN） Type of specimen Distance from the central position/mm -500C -250C Room temperature 800C 1600C 2400C L=30 2.67 - 2.07 2.01 1.71 1.62 White linen granite L=15 1.47 1.51 1.25 1.17 1.06 0.84 L=30 2.35 1.90 1.72 1.27 0.95 0.97 Red linen granite L=15 1.55 1.21 1.21 1.42 0.99 0.75 Table 3 The deviation rate η between F and F0 under different temperature. White linen granite Red linen granite Temperature /0C L=30mm L=15mm L=30mm L=15mm -500C 28.95% 17.86% 37.02% 27.95% -250C - 21.10% 10.61% -0.47% Room temperature 0 0 0 0 800C -2.86% -6.20% -26.02% 17.28% 1600C -17.32% -15.12% -44.53% -18.25% 2400C -21.71% -33.07% -43.39% -37.82% 2.3. The relationship between parameters and temperature
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