Impact of sea-water on the quasi static and fatigue flexural properties of GFRP

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, Polyethylene 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.

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“…Actually, on real operation conditions, the sea-water represents a considerable degradation factor to the synthetic fibres properties [10].…”

Section: Fatiguementioning

confidence: 99%

Cyclic Stress Analysis of Polyester, Aramid, Polyethylene and Liquid Crystal Polymer Yarns

et al. 2016

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“…Fatigue is not relevant in polyester and vinylester composites either (Poodts et al, 2013). Nevertheless, fatigue must be considered in pinned joints designed for fixing GFRP elements together, as load-bearing strength decreases by about 10% (Alaattin and İbrahim, 2008).…”

Section: Materials Selectionmentioning

confidence: 98%

Glass fiber-reinforced polymer caissons used for construction of mooring dolphins in Puerto del Rosario harbor (Fuerteventura, Canary Islands)

Garcia-Espinel

Alvarez-Garcia-Luben

Gonzalez-Herrero

et al. 2015

Coastal Engineering

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“…Moreover, it was shown that moisture inhibits the high wear at low speed displacement [11]. The positive impact of sea-3 water on the fatigue resistance of glass fiber reinforced polyester or vinylester resin systems has been reported [12]. In previous work [13], the friction and wear behavior of carbon fiber reinforced epoxy under ambient air conditions were evaluated, which showed that both friction and wear depend strongly on the carbon fiber orientation relative to the sliding direction.…”

Section: Introductionmentioning

confidence: 99%

Surface and sub-surface degradation of unidirectional carbon fiber reinforced epoxy composites under dry and wet reciprocating sliding

Dhieb

Buijnsters

Eddoumy

et al. 2013

Composites Part A: Applied Science and Manufacturing

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In this paper, the effect of water on the friction and wear of a carbon fiber reinforced epoxy tested under reciprocating sliding against a stainless steel counter body is reported. The tribological behavior of unidirectional carbon fiber reinforced epoxy composite was investigated in ambient air and in demineralized water, and the role of water on the (sub-) surface degradation is discussed. The effect of sliding direction relative to the fiber orientation has been studied. The correlation between the debonding of carbon fibers at the fiber-epoxy interface, and the wear behavior of the carbon fiber composite are discussed based on an indepth analysis of the worn surfaces done by environmental scanning electron microscopy, white light interferometry, atomic force microscopy, and focused ion beam. We demonstrate that the carbon fiber reinforcement greatly improves the tribological properties of epoxy under sliding in both dry environment and demineralized water. A reciprocating sliding performed along an anti-parallel direction to the fiber orientation under dry conditions results in a large degradation by debonding and breaking of the carbon fibers compared to sliding in 2 parallel and perpendicular directions. Immersion in water has a harmful effect on the wear resistance of the carbon fiber reinforced epoxy composite. The competition between crack growth and the wear rate of epoxy matrix and/or carbon fibers in the sliding track determines the level of material loss of the composite in both test environments.

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Impact of sea-water on the quasi static and fatigue flexural properties of GFRP

Cited by 39 publications

References 29 publications

Cyclic Stress Analysis of Polyester, Aramid, Polyethylene and Liquid Crystal Polymer Yarns

Cyclic Stress Analysis of Polyester, Aramid, Polyethylene and Liquid Crystal Polymer Yarns

Glass fiber-reinforced polymer caissons used for construction of mooring dolphins in Puerto del Rosario harbor (Fuerteventura, Canary Islands)

Surface and sub-surface degradation of unidirectional carbon fiber reinforced epoxy composites under dry and wet reciprocating sliding

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