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Comportement mécanique de fibres et d'assemblages de fibres en polyester pour câbles d'amarrage de plates-formes offshore ArchiMer
Lechat, Céline.
Faced with the need to exploit off-shore oil fields at ever increasing depths, lighter replacements are being considered for the standard steel cable mooring systems used for platforms. This study considers the mechanical behaviour of synthetic ropes made of two different materials: PET and PEN. The first is already used in ropes to replace steel, and the second could be a potential competitor. A multi-scale study, involving mechanical tests (mainly tensile, creep and cyclic loading) has been carried out on assemblies of various sizes, from ropes of several hundreds kN breaking load to their smallest components: filaments. Strong correlations were found between the quasi-static behaviour of assemblies and the behaviour of filaments, which in itself is...
Tipo: Text Palavras-chave: Failure; Fatigue; Creep; Tensile loading; Rope; Yarn; Fibre; PEN; PET; Rupture; Fatigue; Fluage; Traction; Câble; Yarn; Fibre; PEN; PET.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-4312.pdf
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Creep of a C-S-H gel: a micromechanical approach Anais da ABC (AABC)
Sanahuja,Julien; Dormieux,Luc.
Both clays and calcium silicate hydrates(the main hydration products of Portland cements) exhibit a microstructure made up of lamellar particles. The microscopic mechanism responsible for the macroscopic creep of such materials is often described as the relative sliding of the sheets. This paper proposes a micromechanical approach to estimate the macroscopic creep behavior rising from this microscopic mechanism. The asymptotic evolution of creep at both short- and long-term is especially investigated. More precisely, a non-vanishing initial elastic strain is retrieved. At long-term, a threshold on porosity appears. At lower porosities, the creep evolution admits an asymptotic strain. At higher porosities, it admits an asymptotic strain rate.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Homogenization; Creep; Cement paste; C-S-H gel.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100004
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Influence of water on the short and long term mechanical behaviour of polyamide 6 (nylon) fibres and yarns ArchiMer
Humeau, Corentin; Davies, Peter; Le Gac, Pierre Yves; Jacquemin, Frédéric.
Polyamide fibres are known to be sensitive to water, and this has limited their marine applications. However, their low stiffness and high strength could be attractive for shallow water mooring line ropes, particularly for floating wind turbines. Such applications require the influence of water on mechanical behaviour to be fully understood, and this paper presents results describing how water affects static and creep response of polyamide 6 fibre yarns. First, the effect of water on fibre Tg is quantified, then tensile behaviour is examined. Finally, a model based on Schapery’s non-linear creep analysis is identified for different humidity conditions. The results show that while moisture has a small effect on short-term tensile behaviour, long term...
Tipo: Text Palavras-chave: Aging; Moisture; Fibre; Creep; Viscoelastic model.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00460/57190/59251.pdf
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Le comportement en fluage, en fatigue et la tenue au feu de composites sandwichs ArchiMer
Chevalier, J.
Baltek Corp. is currently in the process of introducing 3 new products: density select material, AL-600/10 and DecoLite panels, that reduce weight and cost. Creep results on typical core materials have shown that only end-grain balsa (EGB) and 9.0 lb. Nomex honeycomb were capable of continuous operation at 160 F (71 degree C). In reverse bending fatigue studies, EGB has a fatigue limit 2-2.4 times that of the PVC foams. Finally, while EGB by itself is a ASTM E-84 Class 2 material, with the proper skins and resin system, it can easily meet Class 1 requirements.
Tipo: Text Palavras-chave: Fatigue (materials); Creep; Fire; Ship technology; Ship design; Composite materials; Feu; Nid d'abeille; PVC; Ame balsa; Sandwich; Composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1065.pdf
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