高应变率下砂岩动态拉伸性能SHPB试验与分析

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Abstract In order to investigate the dynamic tensile performance of mine sandstone under high strain rate，variable cross-section split Hopkinson pressure bar(SHPB) apparatus is used to measure both the dynamic tensile stress and the strain rate of specimens. Rock samples are processed into disc specimens with the thick-diameter ratio of 0.5. Six impact pressures loaded in radial direction are applied in splitting tests to implement various loading speeds. The results show that not only splitting failure mode of tested specimens meets the validity condition in Brazilian disc test，but also radial stress distribution in specimen achieves the stress homogenization demand. Both the actuall measured waves and the strain rate effect are analyzed. The tensile stress and the strain rate of specimens under high strain rate are also studied. When the impact pressures are in the test range and the average strain rate increases from 48 to 137 s－1，the relationship between the average strain rate and the impact pressure is approximately an logarithmic function，and that between the dynamic tensile strength and the average strain rate is close to a power function.

Key words： rock mechanics sandstone high strain rate split Hopkinson pressure bar(SHPB) Brazilian disc dynamic tension

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	Articles by authors
	PING Qi1
	MA Qinyong1
	ZHANG Jingshuang1
	YUAN Pu1
	CHEN Baisheng2

Cite this article:

PING Qi1,MA Qinyong1,ZHANG Jingshuang1, et al. SHPB TEST AND ANALYSIS OF DYNAMIC TENSILE PERFORMANCE OF SANDSTONE UNDER HIGH STRAIN RATE[J]. , 2012, 31(S1): 3363-3369.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/3363

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