Tension fatigue failure prediction for HMPE fibre ropes

Type Article
Date 2018-02
Language English
Author(s) Humeau Corentin1, Davies PeterORCID1, Smeets P.2, Engels T. A. P.3, 4, Govaert L. E.4, Vlasblom M.2, Jacquemin F5
Affiliation(s) 1 : IFREMER, Ctr Bretagne, Lab Comportement Struct Mer, CS 10070, F-29280 Plouzane, France.
2 : DSM Dyneema, Urmonderbaan 22, NL-6167 Geleen, Netherlands.
3 : DSM Mat Sci Ctr, Urmonderbaan 22, NL-6167 Geleen, Netherlands.
4 : Eindhoven Univ Technol, NL-5612 AZ Eindhoven, Netherlands.
5 : EMM GeM, 58 Rue Michel Ange, F-44600 St Nazaire, France.
Source Polymer Testing (0142-9418) (Elsevier Sci Ltd), 2018-02 , Vol. 65 , P. 497-504
DOI 10.1016/j.polymertesting.2017.12.014
WOS© Times Cited 11

In order to predict the lifetime of fibre rope mooring lines it is essential to be able to predict their behaviour under tension fatigue. Creep failure is known to be a major contributor to fatigue in synthetic fibres and models to predict creep failure are well-established. We show that expansion of such models to varying loading conditions allows the prediction of the fatigue performance. However, it is difficult to design tests to quantify the fatigue performance for HMPE ropes since often premature failure occurs due to external abrasion and viscous heating due to too high testing frequencies or amplitudes. This paper presents a testing methodology which allows tensile fatigue lifetime to be evaluated by testing at higher temperature to avoid premature abrasion failure. We also show that when the temperature evolution due to viscous heating is properly accounted for the modelling framework presented can be effectively used to describe the premature failure occurring due to this heating effect. Results from tests on yarns and small ropes are presented, and a predictive model for rope fatigue lifetime has been validated.

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