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.
Professor PHILIP SHIPWAY firstname.lastname@example.org
Cripps Professor of Engineering Materials
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|
|Peer Reviewed||Peer Reviewed|
|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|
|Keywords||Fretting wear, experimental, grease-lubrication, contact geometry, slip amplitude, flexible risers, pressure armour layer, nub-groove|
|Copyright Statement||Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0|
As accepted - for Open Access Shipway.pdf
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0