Reference method for determining sample size in rock materials SHPB tests

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (17) : 24-28.

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Reference method for determining sample size in rock materials SHPB tests

GONG Fengqiang1,2, LI Xibing1,，ＲＡＯＱｉｕｈｕａ3, LIU Xiling1

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Abstract

According to the transmission-reflection laws of stress waves between elastic bar with rock sample in rock SHPB tests，a look-up table to obtain the relative stress difference value was given by using the reflection coefficient and the back-forth communication number of stress wave in rock.Based on the reflection coefficient and the request for the relative value of stress difference in specific tests, the minimum transmission times to satisfy stress equilibrium can be checked by using this look-up table. On this basis, examining the relationship between rock density, velocity and the minimum transmission times, the velocity of the rock core samples plays a very significant influence to reflection coefficient and the maximum length of rock sample. The results show that, there is a quadratic function relationship between the wave velocity of rock with the maximum length of sample. Before SHPB experiments on rock, testing the velocity of the rock and according to this quadratic function relationship, the maximum length allowed of rock sample can be calculated，which provides a reference method to determine the sample size for specific test condition.

Key words

Rock / SHPB / transmission-reflection law / sample size / maximum length of rock sample

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GONG Fengqiang;LI Xibing;ＲＡＯＱｉｕｈｕａ;LIU Xiling . Reference method for determining sample size in rock materials SHPB tests[J]. Journal of Vibration and Shock, 2013, 32(17): 24-28