核电厂低压进汽导管法兰螺栓断裂原因分析
Cause Analysis on Fracture of Flange Bolts of Low Pressure Steam Inlet Pipe in Nuclear Power Plant
摘 要
某核电厂低压进汽导管法兰螺栓在拆卸时发生断裂，采用化学成分分析、硬度测试、金相检验、断口分析、螺栓受力分析等方法对螺栓的断裂原因进行了分析。结果表明：螺栓螺母硬度不匹配使得该低压进汽导管法兰螺栓咬死，拆卸过程中在过大的扭转剪切力作用下螺栓发生了韧性断裂。
应力集中
韧性断裂
扭转
剪切
bolt
stress concentration
ductile fracture
torsional
shear
Abstract
The flange bolts of low pressure steam inlet pipe fractured during disassembly in a nuclear power plant. The fracture causes of the bolts were analyzed by means of chemical composition analysis, hardness test, metallographic examination, fracture analysis and stress analysis. The results show that the hardness mismatch between the bolts and the nuts caused the flange bolts of the low pressure steam inlet pipe to bite. In the process of disassembly, under the action of excessive torsional shear force, the bolts had ductile fracture.
中图分类号 TG115.2 DOI 10.11973/lhjy-wl202008014
所属栏目 质量控制与失效分析
基金项目
收稿日期 2020/2/10
修改稿日期
网络出版日期
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备注方江(1979-),男,高级工程师,主要从事核电厂在役设备检查工作,fangj@cnnp.com.cn
引用该论文: FANG Jiang,ZHAO Yongming,LIU Hongqun. Cause Analysis on Fracture of Flange Bolts of Low Pressure Steam Inlet Pipe in Nuclear Power Plant[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2020, 56(8): 59～61
方江,赵永明,刘洪群. 核电厂低压进汽导管法兰螺栓断裂原因分析[J]. 理化检验－物理分册, 2020, 56(8): 59～61
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【6】李伟光,孔全兴,杨宏欢,等.核电站螺栓腐蚀与防护[J].全面腐蚀控制,2019,33(4):69-72.
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【10】方栋,陈继志.高强度螺栓螺纹根部应力集中的有限元分析[J].材料开发与应用,2007,22(2):37-39.
【11】SHI Y, MENG W, WANG Y. Analysis on shear behavior of high-strength bolts connection[J]. Journal of Building Structures,2011,11(2):203-213.
【12】WANG H, QIN S. High-strength bolt corrosion fatigue life model and application[J]. The Scientific World Journal,2014,8:1-5.
【13】WANG X L, LUO H T. The hanging point of the spatial grid structure high strength bolt fatigue notch effect analysis[J]. Advanced Materials Research,2013,788:554-557.
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