Lateral impact resistance of Q420 steel tubes after atmospheric corrosion

KUANG Jinxin; ZHANG Chuntao; HAO Zhiming; LI Hongxiang

doi:10.11883/bzycj-2020-0090

Volume 41 Issue 2

Feb. 2021

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KUANG Jinxin, ZHANG Chuntao, HAO Zhiming, LI Hongxiang. Lateral impact resistance of Q420 steel tubes after atmospheric corrosion[J]. Explosion And Shock Waves, 2021, 41(2): 023303. doi: 10.11883/bzycj-2020-0090

Citation:

KUANG Jinxin, ZHANG Chuntao, HAO Zhiming, LI Hongxiang. Lateral impact resistance of Q420 steel tubes after atmospheric corrosion[J]. Explosion And Shock Waves, 2021, 41(2): 023303. doi: 10.11883/bzycj-2020-0090

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Lateral impact resistance of Q420 steel tubes after atmospheric corrosion

doi: 10.11883/bzycj-2020-0090

KUANG Jinxin^1
,,
ZHANG Chuntao^{1, 2
,
,},
HAO Zhiming^{2, 3},
LI Hongxiang³

1.
School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
3.
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2020-03-27
Rev Recd Date: 2020-05-28

Available Online: 2021-02-02

Publish Date: 2021-02-05

Abstract

Abstract

Q420 circular steel tubes are widely used to build large-scale steel structures. Such buildings serving in mountain areas are subject to atmospheric corrosion and impact load. In order to study the effect of atmospheric corrosion on the crashworthiness of Q420 steel tube members during service, a material model considering corrosion damage was proposed which treated corrosion damage as a change in material parameters. Specifically, a damage factor ω was introduced to modify the Voce constitutive equation based on the one-dimensional damage theory. A constitutive equation for low alloy steel varied with the degree of corrosion was deduced, these model parameters were determined through accelerated corrosion test that used acidic solution to accelerate steel corrosion and used static force to stretch the specimens. Based on the proposed constitutive method, relevant material properties were defined by utilizing the ABAQUS software to establish the finite element model of the Q420 steel tubes. A number of 0.84 meters long Q420 steel tube member models within different degrees of corrosion were developed, and these pipes were impacted at their mid-span by a flat-headed impactor with a certain mass and initial velocity. An explicit dynamic algorithm has been used for the simulation to analyze impact response law of rigid impactor and corroded steel pipes under various initial conditions. In addition, a series of impact tests were conducted to compare the behaviour of pre-corroded Q420 steel tubes subjected to lateral impact by drop hammers falling through changing initial height. The weight loss of pipes respectively was 0%, 10%, 20%, 30% and 40%, and the speed of moving hammers was 4.00, 5.79 and 7.43 m/s. Steel tube specimens were subjected to a constant axial pressure, without considering the effect of the axial force on test results. Numerical results were compared with test results to verify the rationality of the established models. According to numerical and experimental results, it demonstrates that atmospheric corrosion leads to a decrease in the nominal strength of the materials, which has a significant effect on the impact resistance of Q420 steel tubes and causes variation in the time history curve of impact force. With increase of corrosion degree of specimens, the yield strength and ultimate tensile strength of Q420 steel materials show a downward trend. As weight loss of Q420 steel tube increases, peak value of impact force decreases and duration and depth of impact increases. It indicates the decline of lateral impact resistance of Q420 steel tubes affected by atmospheric corrosion that impact stiffness of Q420 steel tubes decreases and overall deformation energy consumption of these components increases after corroded. The initial conditions of impactor have different effects on collision process under same kinetic energy increment. Compared with the increase of the initial mass, increase in the peak value of impact force obtained by increasing the initial velocity of impactor is greater, while the increase of duration is smaller.
- Q420 steel tube,
- atmospheric corrosion,
- crashworthiness,
- constitutive model,
- impact test

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References(20)

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