A dynamic tensile method for M-shaped specimen loaded by Hopkinson pressure bar

SHU Qi; DONG Xinlong; YU Xinlu

doi:10.11883/bzycj-2019-0433

Volume 40 Issue 8

Aug. 2020

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SHU Qi, DONG Xinlong, YU Xinlu. A dynamic tensile method for M-shaped specimen loaded by Hopkinson pressure bar[J]. Explosion And Shock Waves, 2020, 40(8): 084101. doi: 10.11883/bzycj-2019-0433

Citation:

SHU Qi, DONG Xinlong, YU Xinlu. A dynamic tensile method for M-shaped specimen loaded by Hopkinson pressure bar[J]. Explosion And Shock Waves, 2020, 40(8): 084101. doi: 10.11883/bzycj-2019-0433

SHU Qi, DONG Xinlong, YU Xinlu. A dynamic tensile method for M-shaped specimen loaded by Hopkinson pressure bar[J]. Explosion And Shock Waves, 2020, 40(8): 084101. doi: 10.11883/bzycj-2019-0433

Citation:

SHU Qi, DONG Xinlong, YU Xinlu. A dynamic tensile method for M-shaped specimen loaded by Hopkinson pressure bar[J]. Explosion And Shock Waves, 2020, 40(8): 084101. doi: 10.11883/bzycj-2019-0433

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A dynamic tensile method for M-shaped specimen loaded by Hopkinson pressure bar

doi: 10.11883/bzycj-2019-0433

SHU Qi¹,
DONG Xinlong^{1
,
,},
YU Xinlu²

1.
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China
2.
School of Mechatronics Engineering, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2019-11-18
Rev Recd Date: 2020-01-20

Available Online: 2020-07-25

Publish Date: 2020-08-01

Abstract

Abstract

The M-shaped specimen can be used in dynamic tensile testing only by using the conventional split Hopkinson pressure bar, which do not need the connection between specimen and bars. But the feasibility of this method has not been further verified widely. In this paper, the dynamic tensile testing of M-shaped specimen were analyzed and improved by the finite element and experimental method. The results show that: (1) the improved closed M-shaped specimen was proposed, which can enhance the total stiffness of the specimen, effectively reduce the distortion deformation of the specimen and the influence of additional bending moment in the tensile gage section, and easily realize dynamic tensile through Hopkinson pressure bar; (2) the influence of the elastic deformation of the M-specimen on the tensile displacement could be corrected by the stiffness coefficient of specimen, the plastic strain of the tensile section of the specimen can be analyzed accurately; (3) under higher loading rate, it is suggested to adopt loading through the pulse shaper of Hopkinson bar, which can significantly improve the wave oscillation and stress balance at both ends of the specimen, obtain an accurate dynamic stress-strain curve, and realize the dynamic tensile test up to 5 900 s⁻¹ or even higher strain rate. The study provides an important reference for the design and application of tensile test of M-shaped specimen.
- M-shaped specimen,
- dynamic tensile test,
- Hopkinson pressure bar,
- high strain rate,
- stress-strain curve

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References(18)

References

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