高温作用对花岗岩动态压缩力学性能的影响研究
STUDY ON DYNAMIC COMPRESSIVE MECHANICAL PROPERTIES OF GRANITE EXPOSED TO HIGH TEMPERATURES
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.
花岗岩 / 高温 / 动态力学性能 / 应变率 {{custom_keyword}} /
granite / high temperature / dynamic mechanical properties / strain rate {{custom_keyword}} /
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