Abstract:
By using thermocouple multi-channel temperature tester and infrared thermal imager, the changes of physical temperature and infrared radiation temperature during mode-Ⅰ crack development of sandstone flattened Brazilian disk (FBD) specimen were measured respectively.In the thermocouple multi-channel temperature test, about 95% of the specimens have experienced stress change at the crack initiation, while the physical temperature increases abruptly, with the maximum temperature increases by 0.74 ℃ (the average temperature increases by 0.16 ℃).In the test of infrared thermal imager, the infrared radiation temperature of about 20% specimens increases at crack initiation (the average temperature increases by 0.03 ℃). The experimental results show that the physical temperature measurement technology and infrared temperature measurement technology can capture the temperature variation in crack development before coal and rocks fail.