Damage Evolution Equation of Concrete Materials at High Temperatures and High Strain Rates

WEN Yanbo; HUANG Ruiyuan; LI Ping; MA Jian; XIAO Kaitao

doi:10.11858/gywlxb.20200617

Volume 35 Issue 2

Mar 2021

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Chinese Journal of High Pressure Physics > 2021 > 35(2): 024103.

WEN Yanbo, HUANG Ruiyuan, LI Ping, MA Jian, XIAO Kaitao. Damage Evolution Equation of Concrete Materials at High Temperatures and High Strain Rates[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024103. doi: 10.11858/gywlxb.20200617

Citation:

WEN Yanbo, HUANG Ruiyuan, LI Ping, MA Jian, XIAO Kaitao. Damage Evolution Equation of Concrete Materials at High Temperatures and High Strain Rates[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024103. doi: 10.11858/gywlxb.20200617

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Damage Evolution Equation of Concrete Materials at High Temperatures and High Strain Rates

doi: 10.11858/gywlxb.20200617

WEN Yanbo^1
,,
HUANG Ruiyuan^{1,*
,
,},
LI Ping²,
MA Jian³,
XIAO Kaitao⁴

1.
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
School of Mechanical Engineering, Anhui University of Technology, Ma'anshan 243032, Anhui,China
3.
Naval Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang 215600, Jiangsu, China
4.
Research Institute of Chemical Defense, Beijing 102205, China

Received Date: 22 Sep 2020
Rev Recd Date: 25 Oct 2020

Abstract

Abstract

In this paper, the dynamic mechanical properties of C45 concrete materials at different temperatures (20, 200, 400 °C) are carried out on split Hopkinson pressure bar (SHPB) equipment with a large diameter of 74 mm. The stress-strain curves of concrete materials at different temperatures and strain rates are obtained through experiments. As the expansion of microcracks inside concrete materials is inhibited by the increase of strain rate, the concrete specimens exhibit strain rate hardening effect. The experimental results show that the concrete material has temperature hardening and strain rate hardening in the temperature range of 20 °C to 400 °C. Through the relevant theoretical derivation, the SHPB experimental data of concrete materials are transformed into the relationship between damage variables and plastic strain. Then the material parameters of the damage evolution equation at different temperatures and different strain rates are determined by relevant experimental data. Finally, the damage evolution equation of concrete materials at high temperatures and high strain rates are applied to the constitutive relation of concrete materials. The prediction results are in good agreement with the experimental data.
- concrete,
- split Hopkinson pressure bar (SHPB),
- strain rate effect,
- damage evolution equation

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References(26)

References

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