Q420钢管大气腐蚀后的抗侧撞性能

旷金鑫; 张春涛; 郝志明; 李洪祥

doi:10.11883/bzycj-2020-0090

Q420钢管大气腐蚀后的抗侧撞性能

doi: 10.11883/bzycj-2020-0090

旷金鑫^1,,
张春涛^{1, 2, ,},
郝志明^{2, 3},
李洪祥³

1.
西南科技大学土木工程与建筑学院，四川绵阳 621010
2.
西南科技大学土木工程与建筑学院工程材料与结构冲击振动四川省重点实验室，四川绵阳 621010
3.
中国工程物理研究院总体工程研究所，四川绵阳 621999

基金项目: 国家自然科学基金(51508482，51568058)；西藏自治区科技计划(CGZH2018000014)

详细信息

作者简介:
旷金鑫（1993－　），男，硕士研究生，1308765668@qq.com

通讯作者:
张春涛（1983－　），男，博士，副教授，zhangchuntao1@126.com

中图分类号: O347
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- 文章访问数: 778
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- 被引次数: 0
出版历程
- 收稿日期: 2020-03-27
- 修回日期: 2020-05-28
- 网络出版日期: 2021-02-02
- 刊出日期: 2021-02-05

Lateral impact resistance of Q420 steel tubes after atmospheric corrosion

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

摘要

摘要: 为研究大气腐蚀对Q420钢管构件服役期内耐撞性的影响，提出了计及腐蚀损伤的材料模型。引入损伤因子（ω）修正Voce模型，推导随腐蚀程度变化的低合金钢材本构方程，并通过加速腐蚀试验结果回归相应参数。利用ABAQUS软件定义构件材料特性，建立起受腐蚀的Q420钢管仿真模型，采用显式动力算法分析多种初始状态下，撞击体与不同腐蚀程度钢管的冲击响应规律。开展预腐蚀Q420钢管的落锤试验，将试验结果与数值计算结果进行对比，验证所建模型的合理性。结果表明：大气腐蚀导致材料名义强度降低，对Q420钢管抗撞击能力影响显著；随着腐蚀程度增加，冲击力峰值减小，撞击时间和深度增加；Q420钢管受腐蚀后抗冲击刚度减小，构件整体变形耗能增加，表明大气腐蚀使其抗冲击性能下降；同等动能增量下，增大撞击体初速度比增加初始质量获得的冲击力峰值增幅更大，而所得到的接触时间增幅更小。
- Q420钢管 /
- 大气腐蚀 /
- 耐撞性 /
- 本构方程 /
- 落锤试验
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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图 1 材性试件设计（单位：mm）

Figure 1. Material test piece design (unit: mm)

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图 2 重力式落锤冲击试验装置

Figure 2. Gravity drop hammer impact test device

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图 3 试件边界条件示意图

Figure 3. Schematic diagram of boundary conditions of specimens

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图 4 不同腐蚀程度的试件表面

Figure 4. Specimen surface with different degrees of corrosion

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图 5 计及腐蚀损伤的Q420低合金钢材本构曲线

Figure 5. Constitutive curve of Q420 low alloy steel considering corrosion damage

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图 6 冲击变形过程示意图

Figure 6. Impact deformation process

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图 7 不同腐蚀程度的冲击变形对比

Figure 7. Comparison of impact deformation of different degrees of corrosion

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图 8 仿真模型及网格划分

Figure 8. Simulation model and mesh

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图 9 v=5.97 m/s时冲击力响应计算结果与试验结果对比

Figure 9. Comparison of impact force calculation results and test results at v=5.97 m/s

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图 10 相同冲击条件下不同腐蚀程度的钢管模型变形

Figure 10. Deformation of steel tube model with various degrees of corrosion under the same impact conditions

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图 11 不同腐蚀程度的冲击力-撞深关系曲线

Figure 11. Impact force-depth relation curves with different corrosion degrees

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图 12 钢管构件的刚度退化情况

Figure 12. Stiffness degradation of steel tube components

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图 13 不同腐蚀损伤程度下的冲击能耗趋势

Figure 13. Trend of impact energy consumptionunder different corrosion damages

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图 14 腐蚀程度d=0%下的撞击深度-时间曲线

Figure 14. Impact depth-time curves at d=0%

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图 15 不同腐蚀程度和初始速度下的冲击力时程曲线

Figure 15. Time-history curves of impact forces at different corrosion degrees and initial velocities

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图 16 不同冲击条件下的响应规律对比

Figure 16. Comparison of response lawsunder different impact conditions

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表 1 落锤试验工况

Table 1. Drop hammer test conditions

腐蚀程度/%	试件编号	初始高度/m	冲击能量/J	腐蚀程度/%	试件编号	初始高度/m	冲击能量/J
0	C0H1	0.82	439.57	30	C3H1	0.82	439.57
	C0H2	1.82	975.63		C3H2	1.82	975.63
	C0H3	2.82	1 511.69		C3H3	2.82	1 511.69
10	C1H1	0.82	439.57	40	C4H1	0.82	439.57
	C1H2	1.82	975.63		C4H2	1.82	975.63
	C1H3	2.82	1 511.69		C4H3	2.82	1 511.69
20	C2H1	0.82	439.57
	C2H2	1.82	975.63
	C2H3	2.82	1 511.69

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表 2 静力拉伸材料力学性能

Table 2. Static tensile properties of mechanical properties

腐蚀程度/%	名义屈服强度/MPa	名义极限抗拉强度/MPa	极限应变/%	弹性模量/GPa	伸长率/%
0	446.43	650.90	39.97	206.85	33.37
10	410.80	545.22	37.37	189.78	27.53
20	354.33	488.49	32.00	166.44	23.08
30	319.40	454.46	28.97	151.14	22.43
40	276.39	358.53	20.21	133.74	18.31

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表 3 材性参数预测模型计算结果与试验结果对比

Table 3. Comparison of calculation results and test results of material parameters prediction model

腐蚀程度/%	试验屈服强度/MPa	预测屈服强度/MPa	误差/%	试验极限抗拉强度/MPa	预测极限抗拉强度/MPa	误差/%
0	446.43	454.79	1.87	650.90	645.44	−0.84
10	410.80	404.31	−1.58	545.22	572.23	4.95
20	354.33	359.39	1.43	488.49	506.99	3.79
30	319.40	319.41	0	454.46	448.91	−1.22
40	276.39	283.84	2.70	358.53	397.27	8.02

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表 4 落锤试验工况

Table 4. Drop hammer test conditions

试件编号	冲击力峰值/kN	作用时间/ms	撞击深度/mm	底部挠曲/mm	试件编号	冲击力峰值/kN	作用时间/ms	撞击深度/mm	底部挠曲/mm
C0H1	110.13	5.20	2.32	0.87	C2H3	103.56	7.65	13.91	4.20
C0H2	123.41	5.25	6.30	1.67	C3H1	59.77	7.68	5.94	1.67
C0H3	136.28	6.56	8.33	2.97	C3H2	82.03	7.41	11.74	2.75
C1H1	87.23	5.74	2.97	1.09	C3H3	96.83	8.86	16.81	4.57
C1H2	107.35	6.40	7.10	2.03	C4H1	47.99	8.60	7.39	1.96
C1H3	112.93	7.40	11.52	3.41	C4H2	72.09	8.69	15.43	2.97
C2H1	69.49	6.42	5.00	1.38	C4H3	84.33	9.38	21.52	5.00
C2H2	95.01	6.85	9.64	2.46

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