摘要
脆性材料具有复杂的细微观结构,其宏观力学性能表现出明显的应力敏感性和应变率效应。基于改进的霍普金森压杆(split Hopkinson pressure bar,SHPB)装置的系统实验结果,总结了岩石、石英砂堆积体和K9玻璃珠3类脆性材料与应变率相关的动特性,揭示了脆性材料应变率的内在机制为局部非均匀性的演化。
Brittle materials have complicated inner structures at meso and micro scales,and their macro-mechanical properties show obvious stress sensitivity and strain rate effects.Based on the system experimental results of the modified split Hopkinson pressure bar(SHPB)device,the dynamic behaviour of three brittle materials,i.e.rock,accumulation of quartz sand,and K9 glass beads under various strain rates are summarized.The results show that the evolution of the local inhomogeneity in samples is the intrinsic mechanism of rate-dependent effect on dynamic strength for brittle materials.
作者
徐松林
单俊芳
王鹏飞
XU Song-lin;SHAN Jun-fang;WANG Peng-fei(University of Science and Technology of China,Hefei 230027,China;CAS Key Laboratory for Mechanical Behavior and Design of Materials,Hefei 230027,China)
出处
《现代应用物理》
2020年第3期1-16,共16页
Modern Applied Physics
基金
国家自然科学基金资助项目(11672286,11602267,11472264,11872361)。
