旋转抛物-锥形蚀坑模型及其应用

刘德俊; 田干; 金国锋; 杨正伟; 任碧云; 魏花丽

doi:10.13700/j.bh.1001-5965.2021.0106

旋转抛物-锥形蚀坑模型及其应用

doi: 10.13700/j.bh.1001-5965.2021.0106

1.
火箭军工程大学导弹工程学院, 西安 710025
2.
西安航天复合材料研究所, 西安 710025

基金项目:

国家自然科学基金 52075541

国家自然科学基金 52272446

陕西省自然科学基金 2020JM-354

详细信息

通讯作者:
田干, E-mail: tiangan_2012@163.com

中图分类号: V252
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- PDF下载量: 22
- 被引次数: 0
出版历程
- 收稿日期: 2021-03-03
- 录用日期: 2021-06-04
- 网络出版日期: 2021-06-24
- 整期出版日期: 2022-11-20

Rotating parabolic-conical corrosion pit model establishment and its application

1.
The Missile Institute of Engineering, Rocket Force Engineering University, Xi'an 710025, China
2.
Xi'an Institute of Aerospace Composites, Xi'an 710025, China

Funds:

National Natural Science Foundation of China 52075541

National Natural Science Foundation of China 52272446

Natural Science Foundation of Shaanxi Province 2020JM-354

More Information

Corresponding author: TIAN Gan, E-mail: tiangan_2012@163.com

摘要

摘要:
点蚀是腐蚀介质环境中金属性能劣化的主要形式之一。蚀坑导致的应力集中会使结构整体强度退化, 降低结构的安全性和可靠性。因此, 准确的蚀坑模型对结构应力场的分析具有重要影响。为此, 在典型的蚀坑形貌基础上, 结合蚀坑张开角的定义, 提出旋转抛物-锥形蚀坑模型, 并通过有限元仿真与拉伸破坏试验验证了模型的有效性。结果表明：蚀坑导致的应力集中极大值处于接近坑底或坑口区域, 旋转抛物-锥形蚀坑模型在蚀坑坑底、坑肩及坑口处的应力集中分布带比半椭球形蚀坑模型更准确, 应力敏感性更强。
- 蚀坑 /
- 旋转抛物-锥形模型 /
- 半椭球形模型 /
- 应力集中 /
- 结构强度
Abstract:
As one of the common degradation forms of metal structure exposed to the corrosive medium, pitting may cause the local stress concentration and decrease the strength, reliability and safety of the structure of equipment. Thus, an exact pit model is useful for the stress distribution analysis of the metal structure exposed to the corrosive medium. In this instance, by surveying the pattern of typical corrosive pitting, the concept of pit open angle is redefined, and a novel model called rotating parabolic-conial model is developed. Both FEM simulations and tensile experiments are performed to validate the accuracy and efficiency of the proposed model. It is shown that the maximum of the stress concentration caused by the pitting is generally located around the bottom or mouth area of the pit. Compared with the semi-ellipsoid model, the former is more accurate and sensitive on the description of the stress distribution around the bottom shoulder and mouth of a pit.
- corrosion pit /
- rotating parabolic-conical model /
- semi-ellipsoid model /
- stress concentration /
- structural strength

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图 1 典型蚀坑图

Figure 1. Typical corrosion pit patterns

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图 2 尖深蚀坑示意图

Figure 2. Sharp-deep corrosion pit

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图 3 浅平蚀坑示意图

Figure 3. Shallow-flat corrosion pit

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图 4 λ=0.8的蚀坑形貌比较

Figure 4. Comparison of corrosion pit morphology under λ=0.8

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图 5 λ=1.0的蚀坑形貌比较

Figure 5. Comparison of corrosion pit morphology under λ=1.0

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图 6 λ=1.2的蚀坑形貌比较

Figure 6. Comparison of corrosion pit morphology under λ=1.2

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图 7 模型加载条件与蚀坑网格模型

Figure 7. Boundary condition and mesh model

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图 8 带孔平板示意图

Figure 8. Schematic diagram of plate with hole

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图 9 λ=0.8下的蚀坑局部应力分布

Figure 9. Local stress contribution of corrosion pits under λ=0.8

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图 10 λ=1.0下的蚀坑局部应力分布

Figure 10. Local stress contribution of corrosion pits under λ=1.0

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图 11 λ=1.2下的蚀坑局部应力分布

Figure 11. Local stress contribution of corrosion pits under λ=1.2

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图 12 应力沿不同λ值的蚀坑截面曲线分布

Figure 12. Stress along corrosion pit sections under various λ value

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图 13 拉伸试样及蚀坑形貌SEM图

Figure 13. Tensile samples and corrosion pit morphology of SEM

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图 14 蚀坑断面图与应力云图

Figure 14. Cross section and stress contour of corrosion pits

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表 1 理论与数值Mises应力比较

Table 1. Comparison of theoretical and numerical Mises stress

R(垂直拉伸方向上的节点距孔中心距离/mm)	理论Mises应力/MPa	数值Mises应力/MPa	误差/%
0.4	300	301.97	0.66
0.464	220.02	232.21	5.54
0.5	193.44	200.11	3.45

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表 2 旋转抛物-锥形蚀坑与半椭球形蚀坑应力集中系数

Table 2. Stress concentration factors between rotating parabolic-conial corrosion pit and semi-ellipsoid corrosion pits

γ	K
γ	λ=0.8	λ=1.0	λ=1.2
0.4	2.142
0.6		2.028
0.8	2.128		1.904
1.0	2.152	1.959
1.2		1.934	1.825
1.4			1.818
半椭形蚀坑	2.022	1.866	1.876

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参考文献(22)

[1]	刘治国, 李旭东, 陈川. 单个边缘微观损伤对铝合金材料蚀坑应力集中效应的影响研究[J]. 机械科学与技术, 2021, 40(3): 456-462. doi: 10.13433/j.cnki.1003-8728.20200075 LIU Z G, LI X D, CHEN C. Influence of single marginal microcosmic damage on concentration effect of corrosion pit stress for aluminum alloy[J]. Mechanical Science and Technology for Aerospace Engineering, 2021, 40(3): 456-462(in Chinese). doi: 10.13433/j.cnki.1003-8728.20200075
[2]	LIU D Z, LI Y, XIE X D, et al. Effect of pre-corrosion pits on residual fatigue life for 42CrMo steel[J]. Materials (Basel, Switzerland), 2019, 12(13): 2130-2137. doi: 10.3390/ma12132130
[3]	ISHIHARA S, SAKA S, NAN Z Y, et al. Prediction of corrosion fatigue lives of aluminium alloy on the basis of corrosion pit growth law[J]. Fracture of Engineering Materials and Structures, 2006, 29(6): 472-480. doi: 10.1111/j.1460-2695.2006.01018.x
[4]	FARHAD F, ZHANG X, SMYTH-BOYLE D. Fatigue behaviour of corrosion pits in X65 steel pipelines[J]. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2019, 233(5): 1771-1782. doi: 10.1177/0954406218776338
[5]	XIANG L H, PAN J Y, CHEN S Y. Analysis on the stress corrosion crack inception based on pit shape and size of the FV520B tensile specimen[J]. Results in Physics, 2018, 9: 463-470. doi: 10.1016/j.rinp.2018.03.005
[6]	HASHIM M, FARHAD F, SMYTH-BOYLE D, et al. Behavior of 316L stainless steel containing corrosion pits under cyclic loading[J]. Materials and Corrosion, 2019, 70(11): 2009-2019. doi: 10.1002/maco.201810744
[7]	LI X W, LIANG J S, SHI T, et al. Tribological behaviors of vacuum hot-pressed ceramic composites with enhanced cyclic oxidation and corrosion resistance[J]. Ceramics International, 2020, 46(9): 12911-12920. doi: 10.1016/j.ceramint.2020.02.057
[8]	EUBANKS R A. Stress concentration due to a hemispherical pit at a free surface[J]. Journal of Applied Mechanics, 1954, 21(3): 57-62.
[9]	FUJITA T, SADAVASU T. Stress concentration due to hemispherical pit at a free surface of a thick plate under all around tension[J]. Bulletin of the Japan Society of Mechanical Engineers, 1978, 21(154): 561-565. doi: 10.1299/jsme1958.21.561
[10]	CERIT M. Corrosion pit-induced stress concentration in spherical pressure vessel[J]. Thin-Walled Structures, 2019, 136: 106-112. doi: 10.1016/j.tws.2018.12.014
[11]	CERIT M. Numerical investigation on torsional stress concentration factor at the semi elliptical corrosion pit[J]. Corrosion Science, 2013, 67: 225-232. doi: 10.1016/j.corsci.2012.10.028
[12]	CERIT M, GENEL K, EKSI S. Numerical investigation on stress concentration of corrosion pit[J]. Engineering Failure Analysis, 2009, 16(7): 2467-2472. doi: 10.1016/j.engfailanal.2009.04.004
[13]	HOU J, SONG L. Numerical investigation on stress concentration of tension steel bars with one or two corrosion pits[J]. Advances in Materials Science and Engineering, 2015, 2015: 413737.
[14]	LI J Q. Modelling on the evolution of corrosion pit during stress corrosion[J]. Advances in Petroleum Exploration and Development, 2016, 11(2): 64-69.
[15]	LIU L, HOU N, DING N, et al. Interacting effects of internal defects and corrosion pits on the stress concentration of hourglass shaped specimens[J]. Journal of Failure Analysis and Prevention, 2019, 19(4): 967-975. doi: 10.1007/s11668-019-00682-2
[16]	LI C Q, YANG S T. Stress intensity factors for high aspect ratio semi-elliptical internal surface cracks in pipes[J]. International Journal of Pressure Vessels and Piping, 2012, 96-97(1): 13-23.
[17]	ATLURI S N, KATHIRESAN K. Influence of flaw shapes on stress intensity factors for pressure vessel surface flaws and nozzle corner cracks[J]. Journal of Pressure Vessel Technology, 1980, 102(3): 278-286. doi: 10.1115/1.3263332
[18]	ACUÑA N, GONZÁLEZ-SÁNCHEZ J, KÚ-BASULTO G, et al. Analysis of the stress intensity factor around corrosion pits developed on structures subjected to mixed loading[J]. Scripta Materialia, 2006, 55(4): 363-366. doi: 10.1016/j.scriptamat.2006.04.024
[19]	TURNBULL A, WRIGHT L, CROCKER L. New insight into the pit-to-crack transition from finite element analysis of the stress and strain distribution around a corrosion pit[J]. Corrosion Science, 2010, 52(4): 1492-1498. doi: 10.1016/j.corsci.2009.12.004
[20]	张川, 姚卫星. 危险蚀坑评判及疲劳寿命计算[J]. 机械强度, 2013, 35(2): 207-213. https://www.cnki.com.cn/Article/CJFDTOTAL-JXQD201302019.htm ZHANG C, YAO W X. Judgment of critical pits and calculation of fatigue life[J]. Journal of Mechanical Strength, 2013, 35(2): 207-213(in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-JXQD201302019.htm
[21]	WANG W G, ZHOU A N, FU G Y, et al. Evaluation of stress intensity factor for cast iron pipes with sharp corrosion pits[J]. Engineering Failure Analysis, 2017, 81: 254-269. doi: 10.1016/j.engfailanal.2017.06.026
[22]	国家市场监督管理总局, 国家标准化管理委员会. 金属材料拉伸试验第1部分: 室温试验方法: GB/T228.1—2021[S]. 北京: 中国标准出版社, 2011: 11-14. State Administration for Market Regulation, Standardization Administtration of the People's Republi of China. Metallic materials-Tensile testing-Part 1: Method of test at room temperature: GB/T 228.1—2021[S]. Beijing: Standards Press of China, 2011: 11-14(in Chinese).