关键词: 高温后, 动载强度, 能量加速释放(AER)

Abstract: Impact experiments of post-high temperature sandstone were made on SHPB test system and the curves of stress-strain were obtained.The test results show that the dynamic strength of sandstone under impact decreases with the temperature rise.The parameters were fitted by the theory of accelerating energy release（AER）forecasting the macro destruction portent of rock and the parameters value representing the AER degree were all below one, indicating that the elastic strain energy is in accelerated energy release before the final destruction of the rock sample.The parameter z increased with the temperature rise, indicating that the AER before the rock destruction decreases with the rise of temperature.This research has further improved and developed AER theory and is the first time to adopt AER theory to reveal the energy release characteristics before destruction of post-high temperature rock sample under impact.

Key words: Post high temperature, Dynamic strength, （AER）