不同温度及加载速率对混凝土冲击变形韧性影响

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (6) : 67-71.

论文

利用?100 mm SHPB分离式霍普金森压杆装置研究不同温度及加载速率下混凝土冲击变形韧性。结果表明，高温后混凝土峰值、流动应及冲击韧性均随加载速率增加而增加，应变率效应显著；试件峰前韧性比不断降低，峰后韧性比及韧性转化比逐渐升高；同一加载速率下温度升高总体上使混凝土峰值应变及流动应变增大、冲击韧性降低，试件峰前韧性比呈上升趋势，峰后韧性比及韧性转化比逐渐下降；200℃时其冲击韧性在低应变率下相对较小，在高应变率下超过常温水平。

作者信息 +

Effects of temperature and impact velocity on impact deformation and toughness of concrete

In this paper, the impact deformation and toughness properties of concrete were studied under different temperatures and impact velocities by using a 100mm diameter split Hopkinson pressure bar (SHPB) equipment. The test results indicate that the peak strain, flow strain and impact toughness of concrete increase with strain rate, implying the obvious rate effect. Simultaneously, an increase of loading rate also leads to a decreasing pre-peak toughness ratio and makes the post-peak toughness ratio and toughness conversion ratio increase. For a giving loading rate, the increasing of temperature results in an enhancement of peak strain and flow strain a reduction in impact toughness and an increasing trend of pre-peak toughness ratio. Post-peak toughness ratio and toughness conversion ratio also consistently decrease with temperature. In addition, at 200℃, the impact toughness of concrete firstly decrease, then increase with strain rate as compared with that at room temperature.

Author information +

文章历史 +

摘要

利用100 mm SHPB分离式霍普金森压杆装置研究不同温度及加载速率下混凝土冲击变形韧性。结果表明，高温后混凝土峰值、流动应及冲击韧性均随加载速率增加而增加，应变率效应显著；试件峰前韧性比不断降低，峰后韧性比及韧性转化比逐渐升高；同一加载速率下温度升高总体上使混凝土峰值应变及流动应变增大、冲击韧性降低，试件峰前韧性比呈上升趋势，峰后韧性比及韧性转化比逐渐下降；200℃时其冲击韧性在低应变率下相对较小，在高应变率下超过常温水平。

Abstract

In this paper, the impact deformation and toughness properties of concrete were studied under different temperatures and impact velocities by using a 100mm diameter split Hopkinson pressure bar (SHPB) equipment. The test results indicate that the peak strain, flow strain and impact toughness of concrete increase with strain rate, implying the obvious rate effect. Simultaneously, an increase of loading rate also leads to a decreasing pre-peak toughness ratio and makes the post-peak toughness ratio and toughness conversion ratio increase. For a giving loading rate, the increasing of temperature results in an enhancement of peak strain and flow strain a reduction in impact toughness and an increasing trend of pre-peak toughness ratio. Post-peak toughness ratio and toughness conversion ratio also consistently decrease with temperature. In addition, at 200℃, the impact toughness of concrete firstly decrease, then increase with strain rate as compared with that at room temperature.

导出引用

聂良学1，许金余1,2，任韦波1，何强3. 不同温度及加载速率对混凝土冲击变形韧性影响[J]. 振动与冲击, 2015, 34(6): 67-71

NIE Liang-xue1, XU Jin-yu1, 2, REN Wei-bo1, HE Qiang3. Effects of temperature and impact velocity on impact deformation and toughness of concrete[J]. Journal of Vibration and Shock, 2015, 34(6): 67-71

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