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首页> 美国卫生研究院文献>Materials >Research on the Fractal Characteristics and Energy Dissipation of Basalt Fiber Reinforced Concrete after Exposure to Elevated Temperatures under Impact Loading
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Research on the Fractal Characteristics and Energy Dissipation of Basalt Fiber Reinforced Concrete after Exposure to Elevated Temperatures under Impact Loading

机译：冲击载荷下高温下玄武岩纤维混凝土的分形特征和耗能研究

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摘要

The fractal characteristics and energy dissipation of basalt fiber reinforced concrete (BFRC) with five kinds of fiber volume contents (0.0%, 0.1%, 0.2%, 0.3%, 0.4%) after exposure to different temperatures (20 °C, 200 °C, 400 °C, 600 °C, 800 °C) under impact loading were investigated by using a 50 mm diameter split Hopkinson pressure bar (SHPB) apparatus. Scale-mass distribution rules and fractal dimension characteristics of fragments were studied based on the screening statistical method and the fractal theory. Furthermore, the relationship between the energy consumption density and the fractal dimension of fragments was established, and the effects of fiber content, temperature and impact velocity on fractal dimension and absorption energy were analyzed. The results show that the crushing severity of fragments and fractal dimension increase with the impact velocity under the same fiber content. The energy consumption density increases first and then decreases with increasing fiber content, and also decreases with increasing temperature. When the temperature and fiber content remain unchanged, the energy consumption density increases linearly with the increasing fractal dimension, and under the same impact velocity and temperature, there is no obvious linear relationship between energy consumption density and fractal dimension.
机译：五种纤维体积含量（0.0％，0.1％，0.2％，0.3％，0.4％）的玄武岩纤维增强混凝土（BFRC）在不同温度（20°C，200°C）下的分形特征和能量耗散通过使用直径为50 mm的分体式霍普金森压力棒（SHPB）装置研究了冲击载荷下的400°C，600°C，800°C）。基于筛选统计方法和分形理论，研究了碎片的尺度质量分布规律和分形维特征。此外，建立了能量消耗密度与碎片分形维数之间的关系，并分析了纤维含量，温度和冲击速度对分形维数和吸收能的影响。结果表明，在相同纤维含量下，碎料的破碎强度和分形维数随冲击速度的增加而增大。能量消耗密度首先增加，然后随着纤维含量的增加而降低，并且还随着温度的升高而降低。当温度和纤维含量保持不变时，能量消耗密度随分形维数的增加而线性增加，在相同的冲击速度和温度下，能量消耗密度与分形维数没有明显的线性关系。

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