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

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (6) : 67-71.

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.

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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.

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concrete / elevated temperature / split Hopkinson pressure bar / impact velocity / impact deformation

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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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