| 涡轮铆钉头脱落原因分析 |
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| 引用本文： | 刘松. 涡轮铆钉头脱落原因分析[J]. 失效分析与预防, 2017, 12(1): 49-53. DOI: 10.3969/j.issn.1673-6214.2017.01.010 |
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| 作者姓名： | 刘松 |
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| 作者单位： | 1.中航工业金城南京机电液压工程研究中心, 南京 211106 |
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| 摘 要： | 涡轮冷却器返厂检查时发现，涡轮上的1个铆钉头已经断裂、脱落；经荧光无损探伤检查发现其他一些铆钉在铆钉头与铆钉杆相接的转角R处仍存有裂纹。本研究通过对断口、硬度、化学成分、金相组织等理化检测手段，并结合涡轮结构和使用工况，对涡轮铆钉头脱落原因进行分析。结果表明：铆钉的断裂性质属于微动疲劳；涡轮结构明显存在被铆接件较薄、且硬度远高于铆钉的设计缺陷；铆钉头脱落的主要原因可能与涡轮结构设计不合理及选材不当有关。采用优化涡轮结构、选取抗疲劳强度更佳的铆钉等措施可以预防类似故障再次发生。
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| 关 键 词： | 铆钉 微动疲劳 涡轮 脱落 |
| 收稿时间： | 2016-12-03 |
| 修稿时间： | 2017-01-21 |
Analysis on Head Shedding off from Rivet of Turbine |
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| LIU Song. Analysis on Head Shedding off from Rivet of Turbine[J]. Failure Analysis and Prevention, 2017, 12(1): 49-53. DOI: 10.3969/j.issn.1673-6214.2017.01.010 |
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| Authors: | LIU Song |
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| Affiliation: | 1.AVIC Jincheng Nanjing Electrical and Hydraulic Engineering Research Center, Nanjing 211106, China |
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| Abstract: | A rivet head was found to have shed off from the turbine during the return check.Cracks were also found in the head R angles of some other rivets by means of fluorescence penetrant inspection.In this paper, the cause of rivet head shedding off from turbine was analyzed by means of fracture observation, hardness testing, chemical composition analysis and metallographic examination.The turbine structure and working condition were also considered.The results show that the fracture mode is fretting fatigue fracture.The turbine structure has obvious design deficiency: the riveted part is thin and its hardness is much higher than that of the rivet.The fretting fatigue fracture of rivet is related to design deficiency and material selection.Such measures as improving structure and selecting suitable rivet material can effectively prevent such failure. |
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| Keywords: | rivet fretting fatigue turbine shedding off |
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