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

被引：0

作者：

Ye Z. ^{[1
,2
]}

Li Y. ^{[1
]}

Zhao K. ^{[1
]}

Huang R. ^{[3
]}

Sun X. ^{[1
]}

Zhang Y. ^{[1
]}

机构：

[1] Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230026, Anhui

[2] College of Civil and Environmental Engineering, Anhui Xinhua College, Hefei, 230088, Anhui

[3] National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu

来源：

Zhao, Kai (kzhao@ustc.edu.cn) | 2018年 / Explosion and Shock Waves卷 / 38期

关键词：

Dynamic constitutive relation; SHPB; Steel fiber reinforced concrete (SFRC); Strain rate effect;

D O I：

10.11883/bzycj-2016-0252

中图分类号：

学科分类号：

摘要：

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. © 2018, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.

引用

页码：266 / 270

页数：4

共 6 条

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