Moisture diffusion under hydrostatic pressure in composites

Humeau, Corentin; Davies, Peter; Jacquemin, Frédéric

doi:10.1016/j.matdes.2016.02.012

Cited by 53 publications

(26 citation statements)

References 12 publications

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“…After 2 years, the samples without pressure were placed with the sample at 10 MPa, and there was a strong increase in weight gain of both, up to the value of the specimen which had been subjected to pressure from the start. These results and those from more recent studies [39] reveal the importance of porosity in weight gain measurements. This may explain the contrasting conclusions in much published work.…”

Section: (C) Modelling Long-term Durability: Limitations and Requiremsupporting

confidence: 82%

Environmental degradation of composites for marine structures: new materials and new applications

Davies

2016

Phil. Trans. R. Soc. A.

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This paper describes the influence of seawater ageing on composites used in a range of marine structures, from boats to tidal turbines. Accounting for environmental degradation is an essential element in the multi-scale modelling of composite materials but it requires reliable test data input. The traditional approach to account for ageing effects, based on testing samples after immersion for different periods, is evolving towards coupled studies involving strong interactions between water diffusion and mechanical loading. These can provide a more realistic estimation of long-term behaviour but still require some form of acceleration if useful data, for 20 year lifetimes or more, are to be obtained in a reasonable time. In order to validate extrapolations from short to long times, it is essential to understand the degradation mechanisms, so both physico-chemical and mechanical test data are required. Examples of results from some current studies on more environmentally friendly materials including bio-sourced composites will be described first. Then a case study for renewable marine energy applications will be discussed. In both cases, studies were performed first on coupons at the material level, then during structural testing and analysis of large components, in order to evaluate their long-term behaviour. This article is part of the themed issue 'Multiscale modelling of the structural integrity of composite materials'.

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Section: (C) Modelling Long-term Durability: Limitations and Requiremsupporting

confidence: 82%

Environmental degradation of composites for marine structures: new materials and new applications

Davies

2016

Phil. Trans. R. Soc. A.

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“…En effet, pour le biocomposite asymé trique, la majeure partie des plis est en compression dans la direction transverse aux fibres, entrainant une diminution du volume libre dans le maté riau et donc à fortiori une diminution de la reprise en eau. Ce phé nomè ne a dé jà é té observé pour des composites à matrice polymè re et fibres synthé tiques [34,35].…”

Section: Discussionunclassified

Biocomposites with Asymmetric Stacking for the Study of Hygro-mechanical Couplings

Péron¹,

Célino²,

Castro³

et al. 2019

RCMA

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“…It was noted that the selected immersion temperature (60°C) was generally accepted and studied by the peers as showed, because more higher immersion temperature (90°C) will lead to any cracking of resin matrix and the weight gain values was observed up to 12% as showed . In addition, the hydraulic pressure was determined as 20 MPa to simulate the practical service environment of some new applications …”

Section: Methodsmentioning

confidence: 99%

“…Considering the advantages of FRP materials, the application of FRPs in civil engineering fields have been recently extended to some new fields, such as submarine projects and oceanographic profilers, to replace steel parts (eg, steel rods) . In these new applications, FRPs have to withstand severe and complicated service conditions such as water absorption, high temperatures, hydraulic pressure in the deep ocean, and cyclic loading. Under the combined effect of these conditions, fatigue damage of FRPs is initiated and extended till failure occurs in the long‐term service.…”

Section: Introductionmentioning

confidence: 99%

Effect of postcuring immersed in water under hydraulic pressure on fatigue performance of large‐diameter pultruded carbon/glass hybrid rod

Xian

2019

Fatigue Fract Eng Mat Struct

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A pultruded carbon fibre core (CFC) and glass fibre shell (GFS) hybrid fiber reinforced polymer (HFRP) rod with the diameter of 19 mm was developed. It was kept immersed in water in a self‐designed pressure chamber device with adjustable hydraulic pressure (20 MPa); after immersion, the tension‐tension fatigue performance was measured at stress levels of 41.7%, 33.4%, and 25.0%. Significant postcuring of resin was observed, resulting in the increase in Tgs for the core and shell layers. There was no significant decrease in the tensile strength of the hybrid rod. The fatigue failure of the hybrid rod was accompanied by debonding of CFC/GFS interface, redistribution of cyclic load, and catastrophic splitting or bursting of GFS. The immersion in water under hydraulic pressure led to a significant increase in fatigue life. The increase in the fatigue life was because of the improvement in interface bonding strength and toughness of the resin owing to the postcuring of the resin. After fatigue, significant degradation in the residual interface bonding strength was observed for the hybrid rods.

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Moisture diffusion under hydrostatic pressure in composites

Cited by 53 publications

References 12 publications

Environmental degradation of composites for marine structures: new materials and new applications

Environmental degradation of composites for marine structures: new materials and new applications

Biocomposites with Asymmetric Stacking for the Study of Hygro-mechanical Couplings

Effect of postcuring immersed in water under hydraulic pressure on fatigue performance of large‐diameter pultruded carbon/glass hybrid rod

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