【摘要】 利用大直径(75mm)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.更多还原

【Abstract】 Cycle impact experiments of limestone rock specimens are carried out with a large-sized(75mm)split Hopkinson pressure bar(SHPB)experiment system,the dynamic stress-strain relationships of limestone rock in the impact process are plotted.The energy distribution during the impact process is quantitatively studied,with energy dissipation revealed.At the same time,with the ultrasonic measuring technology,the damage values of limestone rock during the impact are presented.Finally,the relationgship between damage and the stress wave,damage and the energy loss were revealed:the former couple is exponentially related,which can be self-consistent in cyclic impact experiments;the later couple shows a simple linear relationship.更多还原