Test method of dynamic mechanical properties of filling body based on pendulum-loaded rock bar SHPB device

NIU Leilei; WANG Cong; ZHU Wancheng; LUO Ke; TONG Wenhui

doi:10.11883/bzycj-2023-0433

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NIU Leilei, WANG Cong, ZHU Wancheng, LUO Ke, TONG Wenhui. Test method of dynamic mechanical properties of filling body based on pendulum-loaded rock bar SHPB device[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0433

Citation:

NIU Leilei, WANG Cong, ZHU Wancheng, LUO Ke, TONG Wenhui. Test method of dynamic mechanical properties of filling body based on pendulum-loaded rock bar SHPB device[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0433

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Test method of dynamic mechanical properties of filling body based on pendulum-loaded rock bar SHPB device

doi: 10.11883/bzycj-2023-0433

Center for Rock Instability and Seismicity Research, Department of Mining Engineering, School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, Liaoning, China

Received Date: 2023-12-01
Rev Recd Date: 2024-05-22

Available Online: 2024-05-28

Abstract

Abstract

In order to deal with the difficulty of measuring the transmitted wave in the backfilling SHPB (split Hopkinson pressure bar) test, rock bars are used to instead of steel bar as the incident bar and transmitted bar for improving the pendulum hammer driven SHPB system. The wave impedance matching formula and viscoelastic wave propagation in SHPB test is proposed. Based on the study of stress wave propagation in rock bar systems, the viscosity attenuation coefficients of stress wave propagation in the incident and transmitted rock bars and the reflection and transmission attenuation coefficient of the rock bar-backfilling body are defined. Based on the Kelvin-Voigt model, the effects of rock bar density and wave velocity on the transmitted wave measured of the filling body in the SHPB tests were simulated and analyzed by using a one-dimensional wave propagation analysis procedure. The relationship between the wave impedance matching coefficient and the reflection and transmission attenuation coefficient of the rock bar-backfilling body were obtained. According to the characteristics of field backfilling, the wave impedance matching coefficient and the reflection and transmission attenuation coefficient, four long rock bars were selected to modify the pendulum hammer driven SHPB system. The viscosity coefficient of the rock bar was measured and stresses and strains on the interfaces of rock bar and backfilling body were calculated by using the one-dimensional wave propagation analysis procedure. The stress waveform characteristics and signal-to-noise ratio of the transmitted waves were analyzed. The matching degree of four kinds of rock bars and backfilling wave impedance from good to poor is obtained, which is green sandstone, granite, marble and basalt. The dynamic impacting experiment on the filling body was conducted and the stress balance in the sample was verified. The pendulum hammer driven SHPB system with green sandstone incident bar and transmission bar is established, which provides support for the dynamic mechanical characteristics of the backfilling.
- wave impedance matching,
- SHPB,
- Kelvin-Voigt model,
- rock bars

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References(21)

References

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