| 10~1～10~2s~(-1)应变率下花岗岩动态性能试验研究 |
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| 引用本文： | 张华,陆峰.10~1～10~2s~(-1)应变率下花岗岩动态性能试验研究[J].岩土力学,2009,30(Z1):29-32. |
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| 作者姓名： | 张华 陆峰 |
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| 作者单位： | 1. 河海大学,土木工程学院,南京,210098
2. 浙江省建筑设计研究院,杭州,310006 |
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| 摘 要： | 采用分离式Hopkinson压杆(SHPB)上对花岗岩进行了10~1～10~2 s~(-1)应变率段的动态压缩试验.试验主要做了以下3点改进:(1)采用大直径变截面锥杆,并严格限制试件长径比;(2)选用退火紫铜片和药用胶布作为脉冲整形器;(3)在入射杆与试件接触端面加设万向头.此外,通过高―低应变率重复加载试验得到了花岗岩材料在变速重复冲击下特有的力学性能.结论表明,在此应变率段花岗岩材料具有明显的应变率硬化效应,峰值应力前应力-应变曲线的跃进特性.
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| 关 键 词： | 花岗岩 分离式Hopkinson压杆 应变率效应 硬化效应 |
| 收稿时间： | 2008-07-24 |
Test research on dynamic properties of granite under strain rate from 10~1 to 10~2 s~(-1) |
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| ZHANG Hua,LU Feng.Test research on dynamic properties of granite under strain rate from 10~1 to 10~2 s~(-1)[J].Rock and Soil Mechanics,2009,30(Z1):29-32. |
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| Authors: | ZHANG Hua LU Feng |
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| Institution: | 1. College of Civil Engineering, Hohai University, Nanjing 210098, China; 2. Zhejiang Provincial Architectural Design and Research Institute, Hangzhou 310006, China |
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| Abstract: | The dynamic characteristics test on granite under impact loading of strain rate between 101 to 102 s?1 is carried out by split Hopkinson pressure bar (SHPB). Three improvements of SHPB are operated: (1) using large-size Hopkinson pressure bar with variable cross-section and strict slenderness ratio to specimen; (2) using impulse shaper which is made of medicinal adhesive and annealed red copper; (3) setting up universal joint between incident bar and specimen. And the dynamic characteristics of granite under repeated impact are obtained by carrying out varying speed loading test. The results show that the granite has strain rate effect, hardening effect and jumping behaviors of stress-strain curve. |
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| Keywords: | granite split Hopkinson pressure bar strain rate effect hardening effect |
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