Consulta: creatorFacets:"Choqueuse, Dominique"
Registros recuperados: 20
Data/hora: 01/06/2024 08:48:19

Durabilité des composites pour énergie marine renouvelable
Provedor de dados: 5
Autores: Davies, Peter; Boisseau, A.; Choqueuse, Dominique; Thiebaud, F.; Perreux, D.
Composites will play an essential role in the development of ocean energy conversion systems, and their long term durability is critical to the success of these structures. Composites have been widely used in marine applications and in structures highly loaded in fatigue such as wind turbine blades. However, very few data are available to evaluate their performance under conditions which combine long term immersion in sea water and sustained cyclic loading. In this study composites reinforced with three different types of glass fibre and the same epoxy resin have been tested under these conditions, and the influence of aging on both static and fatigue behaviour has been quantified. Fibre type, resin and fibre/resin interface all influence the fatigue...
Tipo: Text
Palavras-chave: Fatigue; Eau de mer; Énergie marine; Hydrolienne; Pale; Fatigue; Sea water; Ocean energy; Tidal turbine; Blade.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00480/59161/61790.pdf

Description and modeling of polyurethane hydrolysis used as thermal insulation in oil offshore conditions
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Choqueuse, Dominique; Melot, D.
Polymers are widely used for passive thermal insulation coatings on steel pipe in offshore oil and gas production. In this industry, structures used in deep sea have to be reliable, as they are in service for more than 20 years in a very severe environment: sea water, hydrostatic pressure and temperature gradient. One of the main questions is how to test and predict the lifetime of such structures in the laboratory? This study presents one approach that has been developed to characterize and predict the degradation of polymers used as thermal insulation materials.  This paper is dedicated to polyurethane (polyether based) degradation in sea water at high temperature. Ageing has been performed in natural sea water under hydrostatic pressure at temperatures...
Tipo: Text
Palavras-chave: Polyurethane; Hydrolysis; Accelerated ageing; Sea water; Coating; Offshore.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00160/27132/25330.pdf

Micro-Tomography to Study High-performance Sandwich Structures
Provedor de dados: 5
Autores: Davies, Peter; Choqueuse, Dominique; Bourbouze, G.
Although X-radiography has been widely used in studies of damage in composite materials, micro-tomography has received less attention, due to the high cost and limited availability of equipment. However, micro-tomographic analysis is a powerful tool, allowing 3D images of sections through sandwich materials to be obtained without specimen preparation. Four examples from a recent study are presented here, which show how micro-tomography can provide unique information on the quality of honeycomb sandwich structures, information on damage mechanisms and internal details of through thickness reinforcement in pinned foam cores.
Tipo: Text
Palavras-chave: Inspection; Adhesive; Meniscus; Pins; Damage.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00029/14061/11311.pdf

Evaluation of Long Term Behaviour of Polymers for Offshore Oil and Gas Applications
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Davies, Peter; Choqueuse, Dominique.
Polymers and composites are very attractive for underwater applications, but it is essential to evaluate their long term behaviour in sea water if structural integrity of offshore structures is to be guaranteed. Accelerated test procedures are frequently required, and this paper will present three examples showing how the durability of polymers, in the form of fibres, matrix resins in fibre reinforced composites for structural elements, and thermal insulation coatings of flow-lines, have been evaluated for offshore use. The influence of the ageing medium, temperature, and hydrostatic pressure will be discussed first, then an example of the application of ageing test results to predict long term behavior of the thermal insulation coating of a flowline will...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00199/30978/29356.pdf

In situ observation of syntactic foams under hydrostatic pressure using X-ray tomography
Provedor de dados: 5
Autores: Lachambre, J.; Maire, E.; Adrien, J.; Choqueuse, Dominique.
Syntactic foams (hollow glass microspheres embedded in a polymeric matrix) are being used increasingly for the purpose of thermal insulation in ultradeep water. A better understanding of the damage mechanisms of these materials at the microsphere scale under such a hydrostatic loading condition is of prior importance in determining actual material limits, improving phenomenological modelling and developing novel formulations in the future. To achieve this goal, a study based on X-ray microtomography was performed on two syntactic foam materials (polypropylene and polyurethane matrix) and a standard foamed PP. A special set up has been designed in order to allow the X-ray microtomographic observation of the material during hydrostatic pressure loading using...
Tipo: Text
Palavras-chave: Syntactic foams; X-ray tomography; Hydrostatic compression test; Non-destructive testing; Synchrotron radiation.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00148/25926/26375.pdf

Durability of polydicyclopentadiene under high temperature, high pressure and seawater (offshore oil production conditions)
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Choqueuse, Dominique; Paris, Marc; Recher, G.; Zimmer, Celine; Melot, D.
In the offshore industry polymer coatings are widely used to ensure thermal insulation of steel pipes, and to avoid over-cooling of the hot oil inside. Because of very severe service conditions (i.e. high temperature, high pressure and presence of seawater) and an expected life time of 20 years, durability of these coatings is a major issue for this industry. Polypropylene and polyurethane are often used for this application, nevertheless these polymers have some limitations in terms of processing time for polypropylene and maximum service temperature for polyurethane. Polycyclopentadiene (pDCPD) shows good processing characteristics and low thermal conductivity, so this polymer could be a good alternative coating in the offshore industry, but the...
Tipo: Text
Palavras-chave: Polydicyclopentadiene; Seawater; Accelerated ageing; Oxidation; Offshore; Field joint.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00114/22534/20233.pdf

Dégradation de matériaux composites dans un environment marin: Nouveaux materiaux et methodes d'essais
Provedor de dados: 5
Autores: Pomies, F; Carlsson, L; Choqueuse, Dominique; Davies, Peter.
The change in composite material properties when these are exposed to a marine environment is of considerable importance to both designers and users of these materials. In this paper new materials are first studied, composites composed of a glass fibre reinforced thermoplastic PPS matrix. It is shown that their poor interfacial resistance to moisture ingress compromises severely the advantage of using a matrix which does not absorb moisture. In the second part of the paper the application of two non-destructive test techniques for following damage development, based on ultrasonic wave propagation and vibration (modal) analysis, are described. These are complemented by first results from a study using fracture mechanics tests to characterise delamination...
Tipo: Text
Palavras-chave: Fractures; Vibration; Epoxy resins; Tests; Materials testing; Mechanical properties; Ultrasonics; Moisture; Ship technology; Composite materials; Mécanique de la rupture; Vibration; Ultrasonique; Thermoplastique; Epoxyde; Humidité.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1064.pdf

Influence of adhesive bond line thickness on joint strength
Provedor de dados: 5
Autores: Davies, Peter; Sohier, L.; Cognard, J. -y.; Bourmaud, A.; Choqueuse, Dominique; Rinnert, Emmanuel; Creac'Hcadec, R.
While the geometry of aerospace assemblies is carefully controlled, for many industrial applications such as marine structures bond line thickness can vary significantly. In this study epoxy adhesive joints of different thicknesses between aluminium substrates have been characterized using physico-chemical analyses (differential scanning calorimetry, DSC; dynamic mechanical analysis, DMA; spectroscopy), nano-indentation and mechanical testing. Thermal analyses indicated no influence of thickness on structure. Nano-indentation revealed no evidence of an interphase at the metal/epoxy interface, nor any change in modulus for different thicknesses, though Raman spectroscopy suggested there may be slight variations in composition close to the substrates....
Tipo: Text
Palavras-chave: Arcan; Mechanical properties; Aluminium; Epoxy.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6638.pdf

Correlation essais-calcul pour materiaux composites en application marine
Provedor de dados: 5
Autores: Choqueuse, Dominique; Davies, Peter; Bigourdan, Benoit.
The use of finite element calculations is valuable in the design of composite structures, but few examples of correlations between measured behaviour and finite element calculations are currently available. After definition of a representative type of structure (a stiffened sandwich boat hull), and construction of a test set-up allowing the loading of such panels (uniform pressure loading of 1 m by 2 m panels), modelling was performed in four laboratories using different finite element codes. The results obtained (deflections and strains) have been correlated with test results. A satisfactory correlation is obtained for deflections (differences around 20% for the central deflection) but the correlation between measured and calculated strains is less...
Tipo: Text
Palavras-chave: Tests; Materials testing; Ship technology; Ship design; Composite materials; Raidisseur; Mousse PVC; Panneau sandwich; Clément fini; Pression répartie.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1046.pdf

Life time prediction of polymer used as thermal insulation in offshore oil production conditions: Ageing on real structure and reliability of prediction
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Choqueuse, Dominique; Melot, D.; Melve, B.; Meniconi, L.
Polymers are widely used for passive thermal insulation coatings on steel pipe in offshore oil and gas production. In this industry, structures used in deep sea have to be reliable as they are in service for more than 20 years in a very severe environment: sea water, hydrostatic pressure, temperature. One of the main questions is how to test and predict the lifetime of such structures in the laboratory. This study presents one approach that has been developed to characterize and predict the degradation of polyurethanes used as thermal insulation materials.  Based on results obtained during accelerated ageing of the PU in sea water, a prediction of degradation through the thickness has been set up taking into account the temperature profile in the coating,...
Tipo: Text
Palavras-chave: Polyurethane; Life time prediction; Hydrolysis; Offshore; Thermal insulation; Durability.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00174/28572/26957.pdf

Novel mechanical characterization method for deep sea buoyancy material under hydrostatic pressure
Provedor de dados: 5
Autores: Le Gall, Maelenn; Choqueuse, Dominique; Le Gac, Pierre-yves; Davies, Peter; Perreux, Dominique.
Syntactic foams, used in submersibles and in pipelines for deep sea oil wells, must be resistant to the severe conditions of the deep sea environment. As these foams will be in service for at least 20 years, their qualification testing is crucial. However, their mechanical characterization under real conditions of use is a challenge. In deep sea, the main loading is hydrostatic compression, however there is no standard procedure for testing material under pure hydrostatic pressure. The aim of this paper is to present a new characterization technique based on buoyancy loss measurement under hydrostatic pressure. To validate the method, two different syntactic foams (one brittle and one ductile) have been tested. Their behaviours under hydrostatic pressure...
Tipo: Text
Palavras-chave: Hydrostatic compression; Syntactic foam; Deep sea; Mechanical characterization.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00201/31191/29590.pdf

Influence of winding pattern on the mechanical behavior of filament wound composite cylinders under external pressure
Provedor de dados: 5
Autores: Hernandez Moreno, H; Douchin, B; Collombet, F; Choqueuse, Dominique; Davies, Peter.
The influence of winding pattern on the mechanical response of filament Wound glass/epoxy cylinders exposed to external pressure is studied by testing cylindrical specimens having stacked layers with coincident patterns in a hyperbaric testing chamber. Different analytical models are evaluated to predict buckling pressure and modes of thin wall cylinders (diameter to thickness ratio d/h of 25) and satisfactory predictions are obtained which are in the same order of magnitude that those obtained in experimental results. Test results show no evident pattern influence on either strength (implosion pressure) or buckling behavior (buckling modes) of thin wall or thick wall (d/h of 10) cylinders. (c) 2007 Elsevier Ltd. All rights reserved.
Tipo: Text
Palavras-chave: Cylindrical shells; Buckling; Filament winding; Polymer matrix composites.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3823.pdf

Experimental testing and modelling of an industrial insulated pipeline for deep sea application
Provedor de dados: 5
Autores: Bouchonneau, Nadege; Sauvant-moynot, Valerie; Choqueuse, Dominique; Grosjean, Francois; Poncet, Emmanuel; Perreux, Dominique.
Ultra-deep water (up to 3000 in) is one of the next frontiers for oil offshore exploitation. It requires the use of conduits having to resist in the long run (durability about 25 years) the mechanical and environmental requests. One of the key points is the thermal insulation of the structure to avoid the formation of hydrates and paraffin plugs inside of the steel pipe. Over the past 10 years, many studies were performed to better understand the behaviour of the syntactic foams used as thermal insulation of pipes for deepwater production, but few tests were run on industrial prototypes to reach the actual thermal properties of the systems. This paper presents the numerical and experimental characterizations of an industrial multilayered insulated pipeline...
Tipo: Text
Palavras-chave: Layered structure; Subsea; Thermal properties; Modelling; Syntactic foam.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12248/9032.pdf

Influence of residual stresses and geometric imperfections on the elastoplastic collapse of cylindrical tubes under external pressure
Provedor de dados: 5
Autores: Le Grognec, Philippe; Casari, Pascal; Choqueuse, Dominique.
The buckling problem of a circular cylindrical shell has long been widely investigated due to its great importance in the design of aerospace and marine structures. Geometric imperfections and residual stresses are inevitable in practice and have been so far frequently considered in analytical and numerical predictions. But little attention has been paid until now on the combined influence of such initial defects on the critical and often unstable response of such elastoplastic structures. In this paper, a shell finite element is designed within the total Lagrangian formulation framework to deal with the elastoplastic buckling and post-buckling of thin cylindrical tubes under external pressure and axial compression. A specific experimental process will be...
Tipo: Text
Palavras-chave: Cylindrical containers under external pressure; Residual stresses; Imperfection sensitivity; Elastoplasticity; Buckling.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7387.pdf

Entire Life Time Monitoring of Filament Wound Composite Cylinders Using Bragg Grating Sensors: III. In-Service External Pressure Loading
Provedor de dados: 5
Autores: Hernandez-moreno, H.; Collombet, F.; Douchin, B.; Choqueuse, Dominique; Davies, Peter.
This article is the third of three papers describing a study of the monitoring of filament wound composite cylinders for underwater applications. Part I described the technological issues and the development of specimens instrumented with embedded gratings and thermocouples, with the aim of monitoring the temperature and strain changes during the cylinder manufacturing presented in Part II. Residual strains are not negligible, over 1,000 axial micro-strain at the end of the curing cycle. Part III describes the response of these cylinders to hydrostatic pressure loading. The same embedded fiber optical Bragg gratings (FBGs) used for parts I and II of the study are here used as strain gauges. Their response is compared to that of classical resistive strain...
Tipo: Text
Palavras-chave: Underwater application; Filament winding; Residual stress; Smart materials; Polymer matrix composites (PMCs).
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7331.pdf

Experimental study and analysis of the mechanical behaviour of syntactic foams used in deep sea
Provedor de dados: 5
Autores: Choqueuse, Dominique.
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00114/22573/20263.pdf

Mechanical Behavior of Syntactic Foams for Deep Sea Thermally Insulated Pipeline
Provedor de dados: 5
Autores: Choqueuse, Dominique; Davies, Peter; Perreux, Dominique; Sohier, L; Cognard, Jean Yves.
Ultra Deep offshore oil exploitation (down to 3000 meters depth) presents new challenges to offshore engineering and operating companies. Flow assurance and particularly the selection of insulation materials to be applied to pipe lines are of primary importance, and are the focus of much industry interest for deepwater applications. Polymeric and composite materials, particularly syntactic foams, are now widely used for this application, so the understanding of their behavior under extreme conditions is essential. These materials, applied as a thick coating (up to 10-15 cm), are subjected in service to: - high hydrostatic compression (up to 30 MPa) - severe thermal gradients (from 4°C at the outer surface to 150°C at the inner wall), and to high bending...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00039/15071/12632.pdf

Comprehensive analyses of syntactic foam behaviour in deepwater environment
Provedor de dados: 5
Autores: Grosjean, Francois; Bouchonneau, Nadege; Choqueuse, Dominique; Sauvant-moynot, Valerie.
Over the past 10 years, numerous studies were performed to better understand the behaviour of the glass syntactic foams used as thermal insulation of pipes for deepwater production. The obtained results outlined some specific behaviour of polymeric syntactic foams reinforced by glass microballoons in service conditions: both water uptake and mechanical stress have a key impact on thermal properties. This article focuses first on the wet behaviour of glass syntactic foams. The effect of water is investigated to better model the nature of water diffusing in syntactic foams with and without a topcoat protection. Secondly, the effect of hydrostatic pressure on coated structure is addressed by using a confined compression test. As polymer material is bonded to...
Tipo: Text
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6382.pdf

Entire Life Time Monitoring of Filament Wound Composite Cylinders Using Bragg Grating Sensors: I. Adapted Tooling and Instrumented Specimen
Provedor de dados: 5
Autores: Hernandez-moreno, H.; Collombet, F.; Douchin, B.; Choqueuse, Dominique; Davies, Peter; Gonzalez Velazquez, J. L.
This paper is the first of three describing the monitoring of filament wound cylinders using Bragg grating sensors. Part I describes the technological issues and the development of specimens instrumented with embedded gratings and thermocouples. The aim is to monitor the temperature and strain changes during cylinder manufacture (see Part II) and in-service behaviour (see Part III). Specimens are filament wound glass reinforced epoxy composites, so two technological problems have to be solved: one is to collect data during fabrication and the second is to remove the specimen from the mandrel without damaging the sensors. These were accomplished by design of a specially adapted split mandrel and a rotating interface between the filament winding machine and...
Tipo: Text
Palavras-chave: Filament winding; Non destructive testing; Residual/internal stress; Polymer matrix composites (PMCs).
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7330.pdf

Entire Life Time Monitoring of Filament Wound Composite Cylinders Using Bragg Grating Sensors: II. Process Monitoring
Provedor de dados: 5
Autores: Hernandez-moreno, H.; Collombet, F.; Douchin, B.; Choqueuse, Dominique; Davies, Peter; Gonzalez Velazquez, J. L.
This article is the second of a series of three papers concerning monitoring of filament wound cylinders using Bragg gratings. In this second part, the tooling presented in Part I is used to embed gratings and thermocouples in filament wound glass reinforced epoxy composite cylinders during fabrication. Bragg grating strain was obtained from wavelength and temperature response, by a calibration technique described here. Results from tests on five cylinders show the Bragg grating's capability to monitor strain evolution during fabrication, and the capacity to detect several phenomena occurring during cure is established, in addition to quantifying the initial material condition of the cylinder before it enters service.
Tipo: Text
Palavras-chave: Filament winding; Non destructive testing; Residual stress; Smart materials.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7329.pdf