| 大理岩动态劈裂拉伸的SHPB实验研究 |
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| 引用本文： | 李伟,谢和平,王启智.大理岩动态劈裂拉伸的SHPB实验研究[J].爆炸与冲击,2006,26(1):12-20. |
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| 作者姓名： | 李伟 谢和平 王启智 |
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| 作者单位： | 1.四川大学土木工程与应用力学系，四川 成都 610065 |
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| 基金项目： | 国家自然科学基金面上项目(40172094)，国家自然科学基金重大项目(50490272) |
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| 摘 要： | 利用直径100 mm的Hopkinson压杆和薄圆形铝片作为波形整形器，用不同弹速径向冲击平台巴西圆盘试样以研究大理岩的动态拉伸强度。分析了试样的应变率、破坏时间、破坏模式，以及破坏过程中的载荷-应变关系，得到了关于大理岩在高应变率下拉伸强度及弹性模量的一些结论。考虑了试样的尺寸大小及两个平台附近应力的时间不均匀性与空间不均匀性对实验结果的影响。同时，利用有限元法对平台巴西圆盘试样的动态应力分布进行了数值模拟，验证了动态劈裂拉伸实验的有效性。
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| 关 键 词： | 固体力学 动态拉伸强度 分离式Hopkinson压杆 大理岩 动态弹性模量 动态劈裂拉伸 平台巴西圆盘 |
| 文章编号： | 1001-1455(2006)01-0012-09 |
| 收稿时间： | 12 25 2004 12:00AM |
| 修稿时间： | 03 28 2005 12:00AM |
An experimental study for the dynamic split tension of marble disc using SHPB |
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| LI Wei,XIE He-ping,WANG Qi-zhi.An experimental study for the dynamic split tension of marble disc using SHPB[J].Explosion and Shock Waves,2006,26(1):12-20. |
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| Authors: | LI Wei XIE He-ping WANG Qi-zhi |
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| Affiliation: | 1.Department of Civil Engineering and Applied Mechanics, Sichuan University, Chengdu 610065, Sichuan, China |
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| Abstract: | In order to investigate the dynamic tension strength of rocks,the flattened Brazilian disc specimens were subjected to diametral impact with different projectile speeds by using the split Hopkinson pressure bar(SHPB) of 100 mm in diameter where a thin aluminum circular plate was used as a pulse shaper.The strain rate,failure time,failure pattern and the relationship between load and strain during the failure process have been analyzed to get some conclusions about the tensile strength and the elastic modulus of marble at high strain rates.The influence of stress nonuniformities near two flattened ends of specimens on test results was taken into account.Meanwhile,the validity of dynamic split tension tests has been confirmed by the numerical simulation of the dynamic stress distribution in flattened Brazilian disc specimens using the finite element technique. |
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| Keywords: | solid mechanics dynamic tensile strength split Hopkinson pressure bar(SHPB) marble dynamic elastic modulus dynamic split tension flattened Brazilian disc |
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