SHPB试验岩石试件应力平衡时间预估分析

平 琦;;马芹永;;袁 璞

振动与冲击 ›› 2013, Vol. 32 ›› Issue (12) : 55-60.

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (12) : 55-60.
论文

SHPB试验岩石试件应力平衡时间预估分析

  • 平 琦1, 2,马芹永1, 2,袁 璞1
作者信息 +

Prediction analyses of stress uniformity time in rock SHPB test

  • PING Qi1,2, MA Qin-yong1,2 , YUAN Pu1
Author information +
文章历史 +

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。

Abstract

According to one-dimensional stress wave theory, the calculation formula for stress distribution in rock specimen was obtained by analyzing the propagation of elastic stress wave in split Hopkinson pressure bar (SHPB) test and some influence factors or rulers of time for stress equilibrium in specimen were also investigated. For three kinds of mine rock specimens loaded by variable cross-section SHPB apparatus, its stress uniformity and time for stress equilibrium were discussed under smoothed actual incident wave or theoretical trapezoidal incident wave which had same rise time with actual incident wave. It was found that using variable cross-section input bar could ensure specimens achieve stress equilibrium before reaching stress peak and meet the valid requirements in the assumption of stress uniformity. Results showed that when rise time was same, theoretical trapezoidal incident wave could replace the actual incident wave to forecast stress uniformity and time for stress equilibrium in rock specimens. The results would give some references in SHPB test for similar brittle materials.

关键词

岩石力学 / 应力平衡时间 / 应力均匀性 / 一维应力波理论 / 分离式Hopkinson压杆(SHPB)

Key words

rock mechanics / time for stress equilibrium / stress uniformity / one-dimensional stress wave theory / split Hopkinson pressure bar (SHPB)

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导出引用
平 琦;;马芹永;;袁 璞. SHPB试验岩石试件应力平衡时间预估分析[J]. 振动与冲击, 2013, 32(12): 55-60
PING Qi;MA Qin-yong;;YUAN Pu. Prediction analyses of stress uniformity time in rock SHPB test[J]. Journal of Vibration and Shock, 2013, 32(12): 55-60

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