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腐蚀对紧固螺栓疲劳的影响。

Influence of Corrosion on Fatigue of the Fastening Bolts.

作者信息

Lachowicz Maciej B, Lachowicz Marzena M

机构信息

Department of Metal Forming, Welding Technology and Metrology, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Lukasiewicza 7-9, 50-371 Wroclaw, Poland.

Machinefish Materials & Technologies Sp. z o.o., Dunska 13, 54-427 Wroclaw, Poland.

出版信息

Materials (Basel). 2021 Mar 18;14(6):1485. doi: 10.3390/ma14061485.

DOI:10.3390/ma14061485
PMID:33803577
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8003002/
Abstract

The aim of the present work was to evaluate high-strength bolt corrosion fatigue based on metallographic examinations. The conducted tests were focused on the analysis of damaged martensitic bolts. It was found that the combined presence of cyclic loads and a corrosive environment was the cause of the accelerated fatigue of the fastening bolts. The tests carried out indicate that the actual operating conditions were different than expected. The corrosion contributed to the loosening of the bolts and initiation of fatigue cracks in the bolt threads. Further damage of the galvanized bolts was caused by fatigue crack growth in their threaded part that propagated towards the centre of the material. Cracks in the zinc coating were transferred to the steel substrate. The corrosion was favored by the oxygen concentration cell and numerous radial cracks appear in the zinc coating. The vibrations accompanying the operation of the wind tower led to their further propagation and the formation of the fatigue fracture in one of the bolts.

摘要

本工作的目的是基于金相检验评估高强度螺栓的腐蚀疲劳。所进行的试验集中于对损坏的马氏体螺栓的分析。结果发现，循环载荷和腐蚀环境的共同存在是紧固螺栓疲劳加速的原因。所开展的试验表明，实际运行条件与预期不同。腐蚀导致螺栓松动以及螺栓螺纹处疲劳裂纹的萌生。镀锌螺栓螺纹部分的疲劳裂纹向材料中心扩展，导致了螺栓的进一步损坏。锌涂层中的裂纹转移到了钢基体上。氧浓差电池促进了腐蚀，锌涂层中出现了许多径向裂纹。风塔运行时伴随的振动导致裂纹进一步扩展，并在其中一个螺栓上形成了疲劳断裂。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5ee1/8003002/84ecce9dfdfa/materials-14-01485-g018.jpg
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本文引用的文献

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High-strength bolt corrosion fatigue life model and application.
ScientificWorldJournal. 2014;2014:567318. doi: 10.1155/2014/567318. Epub 2014 Jul 24.
基于杠杆长度的夹具连接钢结构疲劳分析的解析模型
Materials (Basel). 2021 Dec 14;14(24):7726. doi: 10.3390/ma14247726.