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An experimental study on the key fretting variables for flexible marine risers

O’Halloran, S.M.; Harte, A.M.; Shipway, P.H.; Leen, S.B.

Authors

S.M. O’Halloran

A.M. Harte

S.B. Leen



Abstract

This paper presents an experimental investigation into the effects of contact conformity, contact pressure and displacement amplitude on the gross-slip fretting behaviour grease-lubricated cylinder-on-flat contacts in the context of flexible marine riser pressure armour wire, and compares behaviour with that observed in unlubricated conditions. Characterisation of friction and wear is critical to fretting fatigue life prediction in flexible risers since friction directly controls trailing-edge fretting stresses and hence fatigue crack initiation, on the one hand, and on the other hand, directly affects wear via relative tangential slip (displacement). Wear can have a beneficial or detrimental effect on fatigue crack initiation and propagation, depending on relative slip and slip regime. It is shown that friction and wear are higher for dry conditions than for grease-lubricated conditions. For grease-lubricated conditions, behaviour is determined by whether grease can be retained in the contact (as opposed to being extruded out). Retention (or replenishment) of grease in the contact results in low rates of wear and low coefficients of friction; these conditions are favoured by fretting displacements above a critical value, by low contact conformity, and by low applied loads.

Journal Article Type Article
Publication Date Jan 1, 2018
Journal Tribology International
Print ISSN 0301-679X
Electronic ISSN 1879-2464
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 117
APA6 Citation O’Halloran, S., Harte, A., Shipway, P., & Leen, S. (2018). An experimental study on the key fretting variables for flexible marine risers. Tribology International, 117, https://doi.org/10.1016/j.triboint.2017.07.032
DOI https://doi.org/10.1016/j.triboint.2017.07.032
Keywords Fretting wear, experimental, grease-lubrication, contact geometry, slip amplitude, flexible risers, pressure armour layer, nub-groove
Publisher URL http://www.sciencedirect.com/science/article/pii/S0301679X1730378X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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