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Registros recuperados: 4
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Contribution à l'étude du couplage entre diffusion d'eau et contrainte mécaniques dans les matériaux marins hautes performances ArchiMer
Humeau, Corentin.
The aim of the study was to understand the impact of coupling on water diffusion and mechanical stress on marine installations. Moreover, we identified the key phenomena involved during this type of exposure. When we look to these type of applications we can distinguish two type of materials used: one for the structure and another for mooring facilities. The best performing structural materials appear to be composites, while the most effective mooring devices are made with synthetic ropes. Therefore, we decided to investigate both materials with the same method: first the properties uncoupled, second, as semi-coupled behaviours and finally as one coupled phenomenon. The present work highlights the divergences between uncoupled, semi-coupled and coupled...
Tipo: Text Palavras-chave: Couplage; Diffusion d’eau; Contrainte mécanique; Vieillissement; Polymères; Cordages synthétiques; Composites; Coupling; Water diffusion; Mechanical stress; Ageing; Polymers; Synthetic ropes; Composites.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00499/61023/64424.pdf
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Etude du vieillissement de liaisons adhésives en milieu marin pour application offshore ArchiMer
Bordes, Melanie.
This thesis work was performed with a view to offshore applications, and the aim is to improve understanding of the the long term behaviour of adhesive bonding in a marine environment, in order to replace welding by adhesive bonding on offshore platforms. An experimental method has been developed to collect the data required for a numerical model, to predict the life expectancy of adhesively bonded structures. There are several objectives, the first is to understand the mechanisms of failure of adhesively bonded joints and to evaluate the kinetics of their degradation. So, in a first step, the water absorption of bulk adhesives has been studied under different aging conditions, and its influence on the mechanical and physico-chemical properties of the...
Tipo: Text Palavras-chave: Hydro mechanical modelling; Physico chemical and mechanical properties; Adhesive; Aging; Modélisation hygromécanique; Propriétés physico chimiques et mécaniques; Adhésif; Vieillissement.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-6800.pdf
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Evolution des propriétés mécaniques de matériaux composites verre/polyester gelcoates en milieu marin ArchiMer
Castaing, P; Tsouvalis, N; Lemoine, Lionel.
Glass-fiber reinforced polyester composites with gelcoat are widely used in nautical construction despite the lack of knowledge concerning their durability when immersed in water. This study deals especially with the influence of the osmotic process of degradation on the evolution of the mechanical properties of orthotropic materials, subjected to accelerated ageing tests. This evolution is experimentally evaluated by performing a non destructive test procedure, the vibrational modal analysis, whose results are additionally confirmed by quasi-static mechanical tests (bending and shear). Although gelcoat blistering has no effect on the mechanical properties of the structure, considerable changes are observed in the elastic moduli and in the ultimate...
Tipo: Text Palavras-chave: Osmosis; Aging; Mechanical properties; Glass reinforced plastics; Fibre glass; Composite materials; Durabilité; Propriétés mécaniques; Analyse modale; Osmose; Vieillissement; Gelcoat; Polyester; Matériau composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1058.pdf
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Influence du vieillissement d'une population de crépidules sur l'épifaune associée. Influence sur le recrutement ArchiMer
Haubois, Anne-gaëlle.
Crepidula fornicata (slipper Iimpet) is a gastropod mollusc, coming from the North American east coast. Since its accidentaI introduction on french coasts, fifty years ago, C. fomicata invaded several coastal areas of this country and the bay of Saint Brieuc (Brittany -France) is one of the major site affected by the proliferation. Accumulation of dense mats of the slipper limpet contributes to the modification of the bottom structure and affects the substrate's heterogeneity, allowing the settlement of a diversified vagile and sessile epifauna. In this paper, the effects of the C. fornicata population ageing on epifauna assemblages and recruitment are studied. Quantitative and qualitative analysis of epifauna organisms suggests that, the ageing of the C....
Tipo: Text Palavras-chave: Crepidula fornicata; Vieillissement; Épifaune; Compétition; Baie de Saint-Brieuc; Crepidu/afornicata; Ageing; Epifauna; Competition; Bay of Saint-Brieuc.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00037/14822/12138.pdf
Registros recuperados: 4
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