摘要
运用一维应力波理论,对分离式Hopkinson压杆(SHPB)试验中弹性应力波的传播过程进行了分析,得到了试件应力分布相关计算公式,讨论了试件应力平衡时间的影响因素和变化规律。以变截面杆SHPB试验装置对煤矿岩石试件加载为例,计算分析了3种岩石试件在光滑的试验入射波和与其升时相同的理论梯形入射波加载情况下试件应力均匀性和应力平衡时间。发现采用变截面入射杆进行加载,能够实现岩石试件在应力峰值之前达到应力平衡,满足应力均匀性假定要求的有效条件。结果表明,采用理论梯形入射波可以近似代替与其升时相同的试验入射波,预估岩石试件应力均匀性和应力平衡时间,对类似脆性材料的SHPB试验设计具有一定的参考价值。
According to the one-dimensional stress wave theory, the calculation formula for stress distribution in a rock specimen was obtained by analyzing propagation of elastic stress wave in split Hopkinson pressure bar （SHPB） test, influence factors and laws of time for stress equilibrium in a specimen were also investigated. For three kinds of mine rock specimens loaded with variable cross-section SHPB apparatus, their stress uniformity and time for stress equilibrium were discussed under a smoothed actual incident wave and a theoretical trapezoidal incident wave with the same rise time as the former. It was found that using variable cross-section input bar can make specimens achieve stress equilibrium before reaching stress peak and meet the valid requirements for assumption of stress uniformity. Results showed that when the rise time was the same, the theoretical trapezoidal incident wave can replace the actual incident wave to forecast stress uniformity and time for stress equilibrium in rock specimens. The results provided a reference for SHPB test of similar brittle materials.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第12期55-60,共6页
Journal of Vibration and Shock
基金
安徽高校省级自然科学研究重点项目(KJ2013A085)
住房和城乡建设部科学技术项目计划(2012-K4-2)
安徽省建设行业科学技术计划项目(2012YF-20)
