Sealing failure and fretting fatigue behavior of fittings induced by pipeline vibration

•The sealing failure mechanism of pipeline fittings caused by pipeline vibration is acquired.•The fretting fatigue behavior of pipeline fittings caused by pipeline vibration is acquired.•Effect of pre-tightening torque on the fretting wear of front ferrule is analyzed. Pipeline fittings containing f...

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Bibliographic Details
Published in:International journal of fatigue 2020-07, Vol.136, p.105602, Article 105602
Main Authors: Yan, Yangyang, Chai, Mengjiang
Format: Article
Language:English
Subjects:
Accelerated test
Accelerated tests
Aircraft reliability
Aluminum
Crack propagation
Failure analysis
Failure mechanisms
Fatigue failure
Fatigue life
Fatigue tests
Fittings
Fretting fatigue
Materials fatigue
Pipeline fittings
Pipeline vibration
Pipelines
Sealing
Sealing failure
Tightening
Torque
Vibration analysis
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Summary:•The sealing failure mechanism of pipeline fittings caused by pipeline vibration is acquired.•The fretting fatigue behavior of pipeline fittings caused by pipeline vibration is acquired.•Effect of pre-tightening torque on the fretting wear of front ferrule is analyzed. 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.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105602