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石灰岩的SHPB试验研究

Keywords: 石灰岩,分离式Hopkinson压杆(SHPB),动态力学性能,损伤,能量耗散

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Abstract:

利用大直径(φ75mm)分离式Hopkinson压杆装置(SHPB)实验技术对石灰岩岩石试件进行了循环冲击实验,得到了石灰岩岩石冲击过程中的动态应力-应变曲线,定量研究了冲击过程中的能量耗散.同时利用岩石损伤的超声波测试技术对应力波作用下的石灰岩损伤进行表征,并探究了不同冲击条件下石灰岩损伤和应力波波幅、石灰岩损伤和耗能值之间的关系.在子弹长度相同条件下,石灰岩损伤和应力波波幅呈指数关系,且在累次冲击实验中得到印证.石灰岩损伤与耗能值之间为简单的线性关系.

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