Direct-impact double-loading Hopkinson bar technique

ZHONG Donghai; GUO Xin; XIONG Xuemei; ZHENG Yuxuan; SONG Li

doi:10.11883/bzycj-2022-0210

Volume 43 Issue 4

Apr. 2023

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ZHONG Donghai, GUO Xin, XIONG Xuemei, ZHENG Yuxuan, SONG Li. Direct-impact double-loading Hopkinson bar technique[J]. Explosion And Shock Waves, 2023, 43(4): 044101. doi: 10.11883/bzycj-2022-0210

Citation:

ZHONG Donghai, GUO Xin, XIONG Xuemei, ZHENG Yuxuan, SONG Li. Direct-impact double-loading Hopkinson bar technique[J]. Explosion And Shock Waves, 2023, 43(4): 044101. doi: 10.11883/bzycj-2022-0210

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Direct-impact double-loading Hopkinson bar technique

doi: 10.11883/bzycj-2022-0210

Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China

Received Date: 2022-05-16
Rev Recd Date: 2022-10-24

Available Online: 2022-10-26

Publish Date: 2023-04-05

Abstract

Abstract

When the conventional split Hopkinson pressure bar (SHPB) experimental method is used to realize large deformation of the specimen at a low strain rate, it is often necessary to employ an ultra-long compression bar system. However, the high cost of machining long bars and occupying large laboratory space limits the application and generalization of this technique. In this paper, a direct impact Hopkinson pressure bar double loading experimental technique is proposed. The stress wave in the transmission bar is reflected by the quasi-rigid wall at the end of the transmission bar to realize the double loading of the specimen. The influence of the size of the quasi-rigid mass on the double loading is further analyzed. The two-point wave separation method is used to separate and calculate the superimposed stress wave effectively, and the long duration loading of 1.2 ms is realized in the pressure bar system with a total length of 4 m, and the strain rate curve and stress-strain relationship of the specimen are obtained accurately. The finite element model of both direct-impact double loading and ultra-long Hopkinson bars are established. Numerical results indicate that this experimental technique can effectively achieve double loading of the specimen. Comparing the simulation results of direct-impact double loading Hopkinson bar with those of ultra-long Hopkinson bars, it is evident that the stress-strain relationships obtained by the two experimental devices are completely consistent. For direct-impact double loading Hopkinson bar, the stress-strain relationship calculated by the two-point wave separation technique is the same as that obtained by direct extraction method. Then, an experimental device of direct impact double-loading Hopkinson pressure bar has been set up, including a strike bar, a transmission bar and a rigid block. In addition, the dynamic compression experiment of aluminum alloy was carried out using this device, and the large deformation dynamic mechanical properties of aluminum alloy were tested under the strain rate of 10² s⁻¹.
- SHPB,
- double-loading,
- wave inversion,
- intermediate strain rate loading,
- large deformation

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References

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