Correction of non-parallel end-faces of rock specimens in SHPB tests

Yuan Pu; Ma Qinyong

doi:10.11883/1001-1455(2017)05-0929-08

Volume 37 Issue 5

Jul. 2017

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WANG Jun-qi, WANG Liang, ZHANG Jie. Influencesofdilatancyonrockpropertiesundershockloading[J]. Explosion And Shock Waves, 2012, 32(3): 333-336. doi: 10.11883/1001-1455(2012)03-0333-04

Citation:

Yuan Pu, Ma Qinyong. Correction of non-parallel end-faces of rock specimens in SHPB tests[J]. Explosion And Shock Waves, 2017, 37(5): 929-936. doi: 10.11883/1001-1455(2017)05-0929-08

WANG Jun-qi, WANG Liang, ZHANG Jie. Influencesofdilatancyonrockpropertiesundershockloading[J]. Explosion And Shock Waves, 2012, 32(3): 333-336. doi: 10.11883/1001-1455(2012)03-0333-04

Citation:

Yuan Pu, Ma Qinyong. Correction of non-parallel end-faces of rock specimens in SHPB tests[J]. Explosion And Shock Waves, 2017, 37(5): 929-936. doi: 10.11883/1001-1455(2017)05-0929-08

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Correction of non-parallel end-faces of rock specimens in SHPB tests

doi: 10.11883/1001-1455(2017)05-0929-08

Yuan Pu^{1, 2
,},
Ma Qinyong^{1, 2}

1.
MOE Research Center of Mine Underground Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
2.
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China

Received Date: 2016-03-16
Rev Recd Date: 2016-06-29
Publish Date: 2017-09-25

Abstract

Abstract

To investigate the influence of a non-parallel end-face for a short cylinder rock specimen on dynamic mechanical test results, we carried out numerical simulation of the SHPB test for rock material in 9 non-parallelisms and 5 Young's moduli using the finite element analysis software LS-DYNA, with the HJC constitutive model chosen for the rock material. The numerical simulation results show that when the non-parallelism of the rock specimen end-face is below 0.40%, the influence of the non-parallel end-face on the dynamic stress test results is negligible, while the influence of the non-parallel end-face on the dynamic strain test results is much bigger. When the Young's modulus remains the same, there is an approximately linear relation between the test error of the average strain rate and the non-parallelism or between the test error of the peak strain and the non-parallelism. When the non-parallelism remains the same, there is also an approximately linear relation between the test error of the average strain rate and the Young's modulus or between the test error of the peak strain and the Young's modulus. After conducting the binary linear regression analysis for the test error of the average strain rate and the test error of the peak strain obtained from numerical simulation, a correction formula for the average strain rate and the peak strain is proposed for the SHPB test of non-parallel end-face rock specimens.
- rock,
- SHPB,
- non-parallelism,
- strain rate,
- peak strain,
- error

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References(18)

References

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