Abstract
Mooring ropes used in offshore oil platforms are exposed to a set of extreme environmental conditions that can be crucial to their behaviour in service. Considering the elevated mechanical demands on these ropes imposed by both the undersea environment and the station keeping of the vessel, this paper is focused on the experimental determination of the yarns fatigue behavior. In order to be able to foresee and compare their general wear rate, a diagram that correlates the force to which the specimens are submitted to the number of cycles for failure for each material is achieved. The analyzed fibers are Polyester, Aramid, Polyethylne and Liquid Crystal Polymer (henceforth quoted as PET, AR, PE and LCP, respectively), and this work followed a pattern composed by a fixed test frequency and an established maximum stress for the diagrams.
Highlights
The findings of oceanic oil basins, the ones in ultra-deep water regions, have been both exciting news for the oil industry and a challenge for engineers worldwide, entrusted with the endeavour to make the oil extraction a feasible task
Mooring ropes used in offshore oil platforms are exposed to a set of extreme environmental conditions that can be crucial to their behaviour in service
The industrial usage of polymers has grown for decades due to their light weight and good mechanical properties, which can be exemplified by the usage of polymers such as Polyethylene as matrix for wooden reinforced composites, providing an enhanced creep resistance to the material [1], Aramid used for structural components in racing cars [2], and Polyvinylidene Difluoride (PVDF) reinforced composites for high-speed woodworking machines parts [3]
Summary
The findings of oceanic oil basins, the ones in ultra-deep water regions (with depths over 2000 meters), have been both exciting news for the oil industry and a challenge for engineers worldwide, entrusted with the endeavour to make the oil extraction a feasible task. The industrial usage of polymers has grown for decades due to their light weight and good mechanical properties, which can be exemplified by the usage of polymers such as Polyethylene as matrix for wooden reinforced composites, providing an enhanced creep resistance to the material [1], Aramid used for structural components in racing cars [2], and Polyvinylidene Difluoride (PVDF) reinforced composites for high-speed woodworking machines parts [3] This growing trend strengthened the concept of using synthetic ropes to moor oil platforms, once long steel cable lines would bring along factors such as high maintenance fees and high weight.
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