Abstract Pipeline fittings containing ferrules are used to connect sections of aircraft hydraulic pipelines. Therefore, their reliability and stability are essential. The purpose of this investigation is to better understand and analyze the sealing failure mechanism of pipeline fittings produced by pipeline vibration. Based on accelerated tests, the sealing failure mechanism and fatigue life of fittings are discussed. The influences of stress and pre-tightening torque on fretting fatigue behavior are also considered. Results from tests using an electromagnetic shaker apparatus indicate that sealing failure in pipeline fittings is caused by fretting fatigue of the front ferrule. Moreover, the decrease of pre-tightening torque will lead to more serious fretting fatigue.

中文翻译：

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管道振动引起的管件密封失效及微动疲劳行为

摘要 包含套圈的管道配件用于连接飞机液压管道的各个部分。因此，它们的可靠性和稳定性至关重要。本次调查的目的是为了更好地理解和分析管道振动产生的管道配件密封失效机理。在加速试验的基础上，讨论了管件的密封失效机理和疲劳寿命。还考虑了应力和预紧扭矩对微动疲劳行为的影响。使用电磁振动器装置的测试结果表明，管道配件的密封失效是由前套圈的微动疲劳引起的。而且，预紧扭矩的降低会导致更严重的微动疲劳。