STUDY ON DYNAMIC COMPRESSIVE MECHANICAL PROPERTIES OF GRANITE EXPOSED TO HIGH TEMPERATURES
LIU Shi1,XU Jinyu 1,2
1. Aeronautics and Astronautics Engineering College,Air Force Engineering University,Xian 710038,China;2. College of Mechanics and Civil Architecture,Northwest Polytechnic University,Xian 710072,China
摘要采用高温装置对传统的大直径Φ 100 mm SHPB试验设备进行改造,利用该试验系统对采自陕西秦岭山区的花岗岩进行不同高温与冲击荷载共同作用下的动态压缩试验,考察了高温下花岗岩的峰值应力、峰值应变、弹性模量的变化规律。试验结果表明:在25℃~600℃时,高温作用对花岗岩峰值应力的影响不大;800℃~1000℃时,花岗岩峰值应力受高温影响明显,迅速下降;600℃~800℃有可能存在花岗岩内部结构突变的临界温度;随着温度的升高,峰值应变呈现逐渐增加的趋势,而弹性模量离散性较大,大体上呈现逐渐减小的趋势;从总体规律上来说,高温下花岗岩的峰值应力、峰值应变仍然表现出显著的应变率硬化效应。
By using of the high temperature split Hopkinson pressure bar apparatus which is composed of traditional Φ100 mm SHPB and the high-temperature device,the test of granite chosen from shaanxi Qinling mountain under high temperatures and dynamic loadings is carried out. The change rules of the peak stress, peak strain and elastic modulus are studied. It is demonstrated that during 25 ℃ to 600 ℃, temperature has a little effect on the peak stress. But the peak stress drops rapidly with the temperature increment from 800 ℃ to 1000 ℃, and therefore the possible critical temperature is included from 600 ℃ to 800℃. As the temperature increases, the peak strain increase gradually, and the elastic modulus generally presents decreasing trend. All in all, the peak stress and peak strain still show significant strain rate effect at high temperatures.
刘 石;许金余;. 高温作用对花岗岩动态压缩力学性能的影响研究[J]. , 2014, 33(4): 195-198.
LIU Shi;XU Jinyu;. STUDY ON DYNAMIC COMPRESSIVE MECHANICAL PROPERTIES OF GRANITE EXPOSED TO HIGH TEMPERATURES . , 2014, 33(4): 195-198.