高温后玄武岩纤维混凝土冲击破碎分形特征
发布时间：2018-10-25 10:05
【摘要】：采用Ф100 mm分离式霍普金森压杆试验系统,对高温后素混凝土(Plain Concrete,PC)及玄武岩纤维混凝土(Basalt Fiber Reinforced Concrete,BFRC)在冲击荷载作用下破碎块度分布、破碎分维及能耗特性进行研究。结果表明,冲击破坏后试件破碎块度分布为统计意义的分形,温度及弹速的升高导致试件破碎程度及分维值总体增大;BFRC分维在常温及600℃~800℃时普遍小于PC,在200℃~400℃时随弹速提高较PC先减小后增大,纤维掺量为0.2%时BFRC分维相对较大;同一温度下试件能耗密度随分维的增大而增大,相同能耗密度下分维随温度的升高而增大;BFRC分维随弹速的变化有两个临界速度特征点:起裂临界及粉碎临界弹速,在此弹速范围内,试件破碎分形演化特征明显,分维随弹速提高显著增大,且临界弹速随温度的升高逐渐下降。
[Abstract]:The fragmentation distribution, fractal dimension and energy consumption characteristics of plain concrete (Plain Concrete,PC) and basalt fiber reinforced concrete (Basalt Fiber Reinforced Concrete,BFRC) under impact loading were studied by using a 100 mm split Hopkinson compression bar test system. The results show that the fracturing degree distribution of the specimen after impact failure is a fractal of statistical significance. The fracture degree and fractal dimension of the specimen are increased with the increase of temperature and elastic velocity, the fractal dimension of BFRC is generally smaller than that of PC, at room temperature and 600 鈩，
本文编号：2293382
[Abstract]:The fragmentation distribution, fractal dimension and energy consumption characteristics of plain concrete (Plain Concrete,PC) and basalt fiber reinforced concrete (Basalt Fiber Reinforced Concrete,BFRC) under impact loading were studied by using a 100 mm split Hopkinson compression bar test system. The results show that the fracturing degree distribution of the specimen after impact failure is a fractal of statistical significance. The fracture degree and fractal dimension of the specimen are increased with the increase of temperature and elastic velocity, the fractal dimension of BFRC is generally smaller than that of PC, at room temperature and 600 鈩，
本文编号：2293382
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