An empirical model to predict the lifetime of braided HMPE handling ropes under cyclic bend over sheave (CBOS) loading

Type Article
Date 2015-03
Language English
Author(s) Davies PeterORCID1, Francois M2, Lacotte Nicolas1, Vu Thanh Do1, 3, Durville Damien3
Affiliation(s) 1 : IFREMER, Ctr Bretagne, Marine Struct Lab, F-29280 Plouzane, France.
2 : Bur Veritas, Marine & Offshore Div, F-92200 Neuilly Sur Seine, France.
3 : Ecole Cent Paris, MSSMat Lab, F-92290 Chatenay Malabry, France.
Source Ocean Engineering (0029-8018) (Pergamon-elsevier Science Ltd), 2015-03 , Vol. 97 , P. 74-81
DOI 10.1016/j.oceaneng.2015.01.003
WOS© Times Cited 13
Keyword(s) Fibre rope, Bending, Sheave, Abrasion, Fatigue
Abstract Repeated bending over sheaves is one of the main causes of failure of synthetic fibre ropes used in marine operations. There are few published results available and even fewer models allowing lifetime to be estimated. A large new set of data from cyclic bend over sheave (CBOS) tests on 250 kN break load braided HMPE synthetic ropes is presented first, both tests to failure and interrupted tests followed by residual strength measurements. These data are analysed in order to propose an empirical lifetime model. This is identified using constant load tests, then evaluated for variable load sequences. A methodology to include rope lifetime prediction in handling system design is then discussed.
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