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| 丁腈橡胶O形密封圈失效原因分析 |
| Analysis on Failure Cause of NBR O-Ring |
| Received:September 24, 2019 Revised:September 24, 2019 |
| DOI：10.12137/j.issn.2095-5448.2020.01.0017 |
| 中文关键词: O形密封圈；丁腈橡胶；老化；失效；疲劳；微观形貌 |
| 英文关键词: O-ring；acrylonitrile-butadiene rubber；aging；failure；fatigue；micro morphology |
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| Author Name | Affiliation | E-mail | | dai xiaoying* | AVIC Xi’an Aircraft Industry (Group) Company Ltd. | 332852670@qq.com | | LEI Xingping | AVIC Xi’an Aircraft Industry (Group) Company Ltd. | |
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| 中文摘要: |
| 针对飞机油滤系统漏油故障，通过丁腈橡胶O形密封圈外观质量、尺寸、性能、胶料组分和微观形貌测试，分析O形圈失效原因。结果表明：O形圈表面凹痕与O形圈承压能力和装配间隙有关；O形圈内部存在的分层痕迹和异物与生产过程控制不到位有关；O形圈在液压油环境中受到外力作用是其失效的主要原因，破坏形式为疲劳破坏。设定合理的密封压缩量和装配间隙、保证贮存和硫化环境符合要求、提高O形圈密封面加工质量等措施可以预防O形圈失效。 |
| 英文摘要: |
| In this paper，the appearance inspection，dimension measurement，performance test，compound composition analysis and micro morphology analysis of acrylonitrile-butadiene rubber O-rings were carried out for the leakage fault of aircraft oil filter system，and the causes of O-ring failure were analyzed.The results showed that，the surface indentation was related to the pressure bearing capacity and assembly clearance of the O-ring.There were stratified traces and foreign matters in the O-rings，which were related to the inadequate control of the production process.The main reason for the failure of O-ring was the external force in the hydraulic oil environment，and the failure mode was fatigue failure.The failure of O-ring could be prevented by setting reasonable sealing compression and assembly clearance，ensuring the storage and curing environment meet the requirements，and improving the processing quality of O-ring sealing surface. |
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