An empirical model to predict the lifetime of braided HMPE handling ropes under cyclic bend over sheave (CBOS) loading. (15th March 2015)

• Record Type: Journal Article
• Authors: Davies, P.; François, M.; Lacotte, N.; Vu, T.D.; Durville, D.
• Is Part Of: Ocean engineering. Volume 97(2015)
• Page Start: 74
• Page End: 81
• Publication Date: 2015-03-15
• Subjects: Fibre rope -- Bending -- Sheave -- Abrasion -- Fatigue; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2015.01.003
• Languages: English
• ISSNs: 0029-8018

Abstract

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. Highlights: A large new set of data from cyclic bend over sheave (CBOS) tests. An analysis of these data in terms of lifetime. Validation of the analysis using additional 2-load and variable load tests. Discussion of the consequences for safety of ocean handling systems.