A new impact dynamic constitutive relation of steel fiber reinforced concrete and the determination of material parameters

YE Zhongbao; LI Yongchi; ZHAO Kai; HUANG Ruiyuan; SUN Xiaowang; ZHANG Yongliang

doi:10.11883/bzycj-2016-0252

Volume 38 Issue 2

Jan. 2018

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YE Zhongbao, LI Yongchi, ZHAO Kai, HUANG Ruiyuan, SUN Xiaowang, ZHANG Yongliang. A new impact dynamic constitutive relation of steel fiber reinforced concrete and the determination of material parameters[J]. Explosion And Shock Waves, 2018, 38(2): 266-270. doi: 10.11883/bzycj-2016-0252

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A new impact dynamic constitutive relation of steel fiber reinforced concrete and the determination of material parameters

doi: 10.11883/bzycj-2016-0252

1.
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China
2.
College of Civil and Environmental Engineering, Anhui Xinhua College, Hefei 230088, Anhui, china
3.
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, china

Received Date: 2016-08-19
Rev Recd Date: 2016-11-30
Publish Date: 2018-03-25

Abstract

Abstract

In the present study we carried out the dynamic compression experiments of steel fiber reinforced concrete with the fiber volume ratios of 0%, 0.75% and 1.5% using the ∅75 mm large-diameter split Hopkinson pressure bar experimental system to obtain the stress-strain curves at different strain rates. The experimental results show that with the increase of the fiber content and the strain rate, both the peak strain and the peak stress of the steel reinforced concrete rise higher, and the strain softening is observed after the peak stress. Based on the assumption that there are two independent factors controlling the dynamic behavior of the steel fiber reinforced concrete, one related to the strain to indicate the nonlinear stress-strain behavior and the other related to the strain rate to express the strain rate effect, a new type of the dynamic nonlinear visco-plastic constitutive equation was proposed. The details concerning how to get the equation and the material parameters were discussed thoroughly. The experiment curves were fitted using the least squares optimization numerical simulations. Good agreement between the numerical simulations and the experiment curves was achieved, thereby concluding that the new constitutive relation proposed is perfect for steel fiber reinforced concrete.
- steel fiber reinforced concrete (SFRC),
- SHPB,
- strain rate effect,
- dynamic constitutive relation

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References(7)

References

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