Effects of roughness on dynamic compression propertiesof metallic materials by SHPB technique

YE Xiangping; NAN Xiaolong; DUAN Zhiwei; YU Yuying; CAI Lingcang; LIU Cangli

doi:10.11883/bzycj-2021-0008

Volume 42 Issue 1

Jan. 2022

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YE Xiangping, NAN Xiaolong, DUAN Zhiwei, YU Yuying, CAI Lingcang, LIU Cangli. Effects of roughness on dynamic compression propertiesof metallic materials by SHPB technique[J]. Explosion And Shock Waves, 2022, 42(1): 013104. doi: 10.11883/bzycj-2021-0008

Citation:

YE Xiangping, NAN Xiaolong, DUAN Zhiwei, YU Yuying, CAI Lingcang, LIU Cangli. Effects of roughness on dynamic compression propertiesof metallic materials by SHPB technique[J]. Explosion And Shock Waves, 2022, 42(1): 013104. doi: 10.11883/bzycj-2021-0008

Citation:

YE Xiangping, NAN Xiaolong, DUAN Zhiwei, YU Yuying, CAI Lingcang, LIU Cangli. Effects of roughness on dynamic compression propertiesof metallic materials by SHPB technique[J]. Explosion And Shock Waves, 2022, 42(1): 013104. doi: 10.11883/bzycj-2021-0008

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Effects of roughness on dynamic compression propertiesof metallic materials by SHPB technique

doi: 10.11883/bzycj-2021-0008

1.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2021-01-06
Accepted Date: 2021-11-19
Rev Recd Date: 2021-05-17

Available Online: 2021-11-25

Publish Date: 2022-01-20

Abstract

Abstract

Effective reduction of end surface friction is necessary to ensure the validity and accuracy of the split Hopkinson pressure bar (SHPB) experimental results. In order to study the effects of sample roughness and lubrication efficiency on the end surface friction and the final experimental results, copper was selected as a research material due to its steady mechanical properties and strain rate insensitivity of constitutive relation. In order to minimize the effects of end friction, all pressure bars with the diameter of 10 mm had a surface roughnesses of 0.8 μm. Copper samples of three typical surface roughnesses were prepared by mechanical processing and corrosion, then high precision repeat dynamic compression experiments by the SHPB were carried out under the conditions of full lubrication with MoS₂ and complete non-lubrication, respectively. The results show that MoS₂ can only play a good lubrication when the end roughness of the copper samples does not exceed 0.8 μm, then the lubricating efficiency of MoS₂ decreases rapidly with increasing the end roughness of the copper samples, which results in a significant increase in the friction force and the dispersion of experimental data. MoS₂ could not effectively reduce the friction force when the roughness of samples is 1.6 μm, and the lubricating efficiency was almost zero when the roughness is 3.2 μm, although the MoS₂ has been believed to be an effective lubrication used in dynamic compression experiments by the SHPB for a long time. The end roughness of the pressure bars and samples should reach 0.8 μm when MoS₂ is used as lubrication for the SHPB experiments, however, the end roughness of the samples treated by a corrosive solution is difficult to reach 0.8 μm. Therefore, it is necessary to lubricate the end of the samples better than MoS₂, or to modify the experimental data by deducting the friction force to ensure the validity and accuracy of the SHPB experimental results.
- end roughness,
- friction force,
- split Hopkinson pressure bar,
- lubricating effect,
- constitutive relationship

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References(31)

References

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