Une maquette de Notre-Dame de Paris sera réalisée à Felletin par les professionnels de toute la Nouvelle-Aquitaine - Felletin (23500) - La Montagne

Une maquette de Notre-Dame de Paris sera réalisée à Felletin par les professionnels de toute la Nouvelle-Aquitaine - Felletin (23500) - La Montagne

"Le vendredi 13 septembre,  au lycée des métiers du bâtiment de Felletin, sera lancée  l’école du patrimoine Notre-Dame. Le président Alain Rousset l'a imaginée au lendemain du sinistre qui a ravagé la cathédrale. C'est l'une des composantes du traitement de choc dont bénéficie l'établissement creusois centenaire. Le président de la Nouvelle-Aquitaine définit cette stratégie.
...Nous allons mobiliser les professionnels de tous les corps de métiers capables de candidater à la reconstruction de Notre-Dame-de Paris. Il y aura des charpentiers, des tailleurs de pierre mais aussi desspécialistes des matériaux composites qui seront sollicités pour consolider, par exemple, les arcs-boutants.

On va réunir des compagnons du devoir, des PME et des grands groupes, mais aussi tous les centres de formations du bâtiment de la Région, des architectes et des personnalités nationales.

L’objectif, au-delà de la reconstruction du monument, c’est aussi d’apporter aux jeunes de la Région des pistes d’orientation. "

Les actus sur Notre Dame dans le blog, cliquez ici

Trouvez des infos complémentaires dans le blog, cliquez ici 

#Felletin et son #lycée des métiers du #Bâtiment encore à l'honneur avec l'annonce d'une réalisation d'une maquette de Notre Dame de Paris par les professionnels de Nouvelle Aquitaine...

➡️https://t.co/3V0eQE6MCY@RestauronsNDP @LMBFelletin #modélisation #BIM #architecture pic.twitter.com/1YdXXX6AOi

— Françoise AMBIAUX (@franoise7) August 30, 2019

Numerical simulation of a resistant structural bonding in wind-turbine blade through the use of composite cord stitching -Venkadesh Raman - Monssef Drissi-Habti

Numerical simulation of a resistant structural bonding in wind-turbine blade through the use of composite cord stitching - ScienceDirect Venkadesh Raman - Monssef Drissi-Habti

The trailing edge is a critical part of blade because of monolithic bonding, which may lead to separation of edges while wind-turbine is in service. It is easily perceptible that the maintenance is (under harsh environmental conditions) extremely expensive and time-consuming for wind turbine blades with excessive length (100 m). From technological point of view, o shore wind generation maintenance teams are targeting zero-maintenance and/or least maintenance in a well-chosen timing. As a matter of fact, the two halves (top and bottom skins) of a wind blade should hold together as long as possible to allow enough time for maintenance in the event of onset of damage. Accordingly, we are suggesting a strategy, which consist the joints with ‘carbon-fiber cord composite stitching’. In order to implement this technique in industrial application, one should take care of lowering stress concentration as much as possible around drilled holes and should prevent indentation to carbon-fiber cords. This paper is addressing the mentioned technologies in detail, using numerical simulation.

L’utilisation des matériaux composites dans la construction de ponts - Roski

L’utilisation des matériaux composites dans la construction de ponts - Roski

Avez-vous déjà songé qu’il serait possible d’utiliser des matériaux composites pour construire des ponts? Le concept existe pourtant depuis plusieurs années déjà.
En effet, en Amérique du Nord, le premier pont en matériaux composites sur autoroute a été érigé à Magog, au Québec, en 20021. Cet ouvrage conçu par Brahim Benmokrane et son équipe, en étroite collaboration avec le ministère des Transports du Québec, comporte une armature en matériaux composites constitués de polymères renforcés de fibres de verre et de carbone, plutôt que les traditionnelles tiges de métal.

La revue "Essais § Simulations" de mars 2014 consacre un dossier complet aux matériaux composites intelligents en particulier dans les Pays de la Loire

La revue "Essais § Simulations" de mars 2014 consacre un dossier complet  aux matériaux composites intelligents en particulier dans les Pays de la Loire.
Dans ce numéro, figurent également des contributions de l'IRT Jules Verne, d'ALSTOM et des membres du GIS DURSI (ENSAM-Angers, LIMATB de l'Université de Lorient et de l'IFSTTAR) - Lire un extrait

Monssef DRISSI-Habti
(IFSTTAR, The Consortium GIS-DURSI / monssef.drissi-Habti @ ifsttar.fr)
Special Issue of The Journal Testing & Simulation "Smart Composite Materials in The Area Region Pays de la Loire" .The Journal "Test § Simulations" of March 2014 publisehd a Special Issue on Smart Composite Research in The Area Pays de la Loire developped by the Consortium GIS-DURSI (ENSAM-Angers, LIMATB University of Lorient and IFSTTAR ) with contributions from the IRT Jules Verne and ALSTOM.

Sensors | Free Full-Text | Post-Impact Fatigue Damage Monitoring Using Fiber Bragg Grating Sensors

Sensors | Free Full-Text | Post-Impact Fatigue Damage Monitoring Using Fiber Bragg Grating Sensors

Abstract: It has been shown that impact damage to composite materials can be revealed by embedded Fiber Bragg Gratings (FBG) as a broadening and splitting of the latter’s characteristic narrow peak reflected spectrum. The current work further subjected the impact damaged composite to cyclic loading and found that the FBG spectrum gradually submerged into a rise of background intensity as internal damages progressed. By skipping the impact, directing the impact to positions away from the FBG and examining the extracted fibers, we concluded that the above change is not a result of deterioration/damage of the sensor. It is caused solely by the damages initiated in the composite by the impact and aggravated by fatigue loading. Evolution of the grating spectrum may therefore be used to monitor qualitatively the development of the incurred damages.

Keywords: fatigue; impact damage; polymer-matrix composites; health monitoring; fiber Bragg grating

Wind Energy Trends for Composites

Wind Energy Trends for Composites

Economic and social forces are driving trends in material innovation and applications

Source : Plastic Engineering - March 2014

2013/09/27 > BE Allemagne 628 > Productique : les métaux non-ferreux et l'automatisation de procédés de fabrication de matériaux composites

2013/09/27 > BE Allemagne 628 > Productique : les métaux non-ferreux et l'automatisation de procédés de fabrication de matériaux composites

L'Université de Brême et l'Ecole supérieure de Munich (Bavière) ont lancé un nouveau projet, visant à étudier les métaux non ferreux. Le projet, intitulé DelphiNE (Delphi étant le nom d'une méthode d'analyse et NE signifiant métaux non-ferreux), est programmé pour une durée de trois ans.
Les métaux non-ferreux sont de plus en plus utilisés, non seulement dans l'industrie classique, mais aussi pour le stockage d'énergie. Les procédés de production de ces métaux étant considérés par les chercheurs de Brême et de Munich comme trop exigeants pour l'environnement (en termes d'utilisation de ressources ou de consommation énergétique), ils ont donc lancé, dans le cadre d'une discussion initiée par l'Agence fédérale pour l'environnement (UBA) sur "l'économie verte", le projet DelphiNE.

Degradation behavior of biocomposites based on cassava starch buried under indoor soil conditions

Degradation behavior of biocomposites based on cassava starch buried under indoor soil conditions

Degradation of cassava (tapioca) starch based composite films during indoor soil burial experiments was analyzed using five factors, three levels Box–Behnken response surface design. From the results, it was observed that, increased water sorption promotes the entry of soil microorganism and it utilizes the starch films as a source of energy for their growth. The reduction in weight and mechanical property was associated with preferential loss of matrix components of the films. The microorganisms associated with the degradation of films were quantified and identified. Scanning electron microscopy (SEM) analysis showed the formation of patterns and cracks on the surface of the materials aged in the soils. From the results, second order polynomial models were developed for the responses. The results of the study demonstrated that, the tapioca starch based composites were showed a limited lifetime in biotic environment which make them suitable for being disposed in landfills after their use.

Rapport d'activité Technocampus EMC2

Rapport d'activité Technocampus EMC2

 Retrouvez dans ce document une présentation de l'activité du centre Technocampus EMC² pour la période du 1er janvier 2012 au 31 décembre 2012

BREVET : FIBER-REINFORCED NANOPARTICLE-LOADED THERMOSET POLYMER COMPOSITE WIRES AND CABLES, AND METHODS

FIBER-REINFORCED NANOPARTICLE-LOADED THERMOSET POLYMER COMPOSITE WIRES AND CABLES, AND METHODS 

Thermoset polymer composite wires including a multiplicity of substantially continuous fibers embedded in a solidified polymer composite matrix and forming a substantially continuous filament, the solidified polymer composite matrix further including a polymer formed by curing a polymer precursor from a liquid state and a multiplicity of nanoparticles having a median diameter of one micrometer or less substantially uniformly dispersed throughout the polymer composite matrix, and optionally, a corrosion resistant sheath surrounding the substantially continuous filament. In some embodiments, the multiplicity of particles includes surface-modified particles having a core and a surface modifying agent associated with the core and reacted with the polymer cured from a liquid state. Stranded cables including one or more such thermoset polymer composite wires, and methods of making and using such thermoset polymer composite wires and stranded cables are also described.

Composites blowing in the wind

Composites blowing in the wind

Energy generated from wind is now an integral part of the power supply for all major economies and it is composites that form the rotor and capture the wind. The blades have grown in length to over 70 metres as the market matures and moves offshore. All aspects of this vital windmill component are being refined from design to finishing, maximizing power output and minimizing maintenance. The fourth AMI annual global forum on Wind Turbine Blade Manufacture 2013 takes place from 3-5 December 2013 in Dusseldorf, with top speakers from across the industry. The overall aim is to improve energy output performance and cut production costs, so that the wind energy industry improves its competitiveness in the marketplace.

Visit http://www.amiplastics.com for further information

Composites Europe continues on growth course

Composites Europe continues on growth course

More than 400 exhibitors are expected to attend the Composites Europe trade fair that will be held from 17-19 September in Stuttgart, showing an increase in exhibitor numbers. In addition to new lightweight construction concepts, state-of-the-art manufacturing and automation solutions for composites take centre stage this year.
The trade fair will focus on key technologies for the composite applications markets such as automotive, aerospace, wind power as well as building and construction.

Soft-matter composites with electrically tunable elastic rigidity - Abstract - Smart Materials and Structures - IOPscience

Soft-matter composites with electrically tunable elastic rigidity - Abstract - Smart Materials and Structures - IOPscience

We use a phase-changing metal alloy to reversibly tune the elastic rigidity of an elastomer composite. The elastomer is embedded with a sheet of low-melting-point Field's metal and an electric Joule heater composed of a serpentine channel of liquid-phase gallium–indium–tin (Galinstan®) alloy. At room temperature, the embedded Field's metal is solid and the composite remains elastically rigid. Joule heating causes the Field's metal to melt and allows the surrounding elastomer to freely stretch and bend. Using a tensile testing machine, we measure that the effective elastic modulus of the composite reversibly changes by four orders of magnitude when powered on and off. This dramatic change in rigidity is accurately predicted with a model for an elastic composite. Reversible rigidity control is also accomplished by replacing the Field's metal with shape memory polymer. In addition to demonstrating electrically tunable rigidity with an elastomer, we also introduce a new technique to rapidly produce soft-matter electronics and multifunctional materials in several minutes with laser-patterned adhesive film and masked deposition of liquid-phase metal alloy.

Intégration de puces RFID dans les composites fibreux

Intégration de puces RFID dans les composites fibreux

Dans le monde de l'internet des objets [1], le fait d'attribuer des puces munies de codes aux objets et aux lieux permet au personnel d'une chaîne de production d'accéder rapidement à différentes informations : par exemple la nature de la pièce, qui a travaillé dessus et quelle est la prochaine étape à réaliser. Une puce d'identification transmet ces informations à un récepteur radio.

D'après Eurostat, en 2011, environ 6% des entreprises allemandes utilisaient des transpondeurs RFID dans leurs activités de production. A l'échelle de l'Europe, ce chiffre est de 4%. Maximilan Roth, ingénieur à l'Institut Fraunhofer des circuits intégrés de Nuremberg (IIS, Bavière), est convaincu que la situation va changer : "les futures applications des composites fibreux sont nombreuses, elles vont rendre la présence de puces RFID dans ces matériaux rapidement pertinente." (...)

Simulating Fiber-Reinforced Composites. It’s a multiscale world.

Simulating Fiber-Reinforced Composites. It’s a multiscale world

Composite materials, and particularly fiber-reinforced composites, present an interesting challenge. They have superior properties, compared to homogeneous materials, and have the potential to help engineers and designers meet increasingly challenging product requirements. Yet, they can be maddeningly difficult to engineer properly.

To understand why this is so, you need to look closely, at the structure of composites(...)

Preparation of Composite Materials by Using Graphene Oxide as a Surfactant in Ab Initio Emulsion Polymerization Systems

Preparation of Composite Materials by Using Graphene Oxide as a Surfactant in Ab Initio Emulsion Polymerization Systems

Stuart C. Thickett and Per B. Zetterlund *

Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney NSW 2052, Australia

ACS Macro Lett., 2013, 2, pp 630–634;DOI: 10.1021/mz400280t;Publication Date (Web): July 5, 2013

Copyright © 2013 American Chemical Society

Self-sensing of elastic strain, matrix yielding and plasticity in multiwall carbon nanotube/vinyl ester composites - Abstract - Smart Materials and Structures - IOPscience

Self-sensing of elastic strain, matrix yielding and plasticity in multiwall carbon nanotube/vinyl ester composites - Abstract - Smart Materials and Structures - IOPscience

The piezoresistive response of multiwalled carbon nanotube/vinyl ester composites containing 0.3, 0.5 and 1% w/w carbon nanotubes (CNTs) loaded in tension and compression is investigated. The change in electrical resistance (ΔR) under tension loading was positive and showed a linear relationship with the applied strain up to failure, with slightly increased sensitivity for decreased CNT content. In compression, a nonlinear and non-monotonic piezoresistive behavior was observed, with ΔRinitially decreasing in the elastic regime, leveling off at the onset of yielding and increasing after matrix yielding. The piezoresistive response of the composite is more sensitive to the CNT content for compression than for tension, and the calculated gage factors are higher in the compressive plastic regime. The results show that the piezoresistive signal is dependent on the CNT concentration, loading type and material elastoplastic behavior, and that recording ΔR during mechanical loading can allow self-identification of the elastic and plastic regimes of the composite.

Creating smart fiber composites by embedding ultrathin RFID tags

Creating smart fiber composites by embedding ultrathin RFID tags

(Nanowerk News) Antennas that are capable of transmitting radio waves turn components into intelligent objects. Researchers have now found a way to embed these antennas in fiber composites. As a result, the technology also works with carbon and glass fibers.

Read more: http://www.nanowerk.com/news2/newsid=31105.php#ixzz2YAsjbGiU

Dentaire : Composites sans bisphénol A

Composites sans bisphénol A

Le bisphénol A est une substance chimique de synthèse utilisée depuis une cinquantaine d'années dont l'origine est majoritairement (80%) alimentaire selon l'ANSES. Il semble aujourd'hui établi qu'une exposition chronique à ce produit est responsable chez l'homme d'effets sur la reproduction, la glande mammaire, le métabolisme, le cerveau et le comportement. Le bisphénol A serait également responsable d'une altération de l'émail dentaire appelée MIH (Molars Incisors Hypomineralization) ou hypominéralisation molaires Incisives chez les enfants exposés précocement durant la grossesse et la période de lactation. Problème, le bisphénol A est présent au sein des composites employés en dentisterie, en particulier comme substitut à l'amalgame au mercure (encore plus nocif*), en particulier sous la forme de bis-GMA (glicidyl méthacrylate)...............

HAL : Damage investigation in CFRP composites using full-field measurement techniques: combination of digital image stereo-correlation, infrared thermography and X-ray tomography

Damage investigation in CFRP composites using full-field measurement techniques: combination of digital image stereo-correlation, infrared thermography and X-ray tomography

The present work is devoted to damaging process in carbon-fiber reinforced laminated composites. An original experimental approach combining three optical measurement techniques is presented. Image stereo-correlation and infrared thermography, that respectively provide the kinematic and thermal fields on the surface of the composites, are used in live recording during axis and off-axis tensile tests. Special attention is paid to simultaneously conduct these two techniques while avoiding their respective influence. On the other hand, X-ray tomography allows a post-failure analysis of the degradation patterns within the laminates volume. All these techniques are non-destructive (without contact) and offer an interesting full-field investigation of the material response. Their combination allows a coupled analysis of different demonstrations of same degradation mechanisms. For instance, thermal events and densimetric fields show a random location of damage in the early stages of testing. The influence of the material initial anisotropy on damage growth, localization and failure mode can also be clearly put in evidence through various data. In addition to such characterization, this study illustrates at the same time the capabilities of the different full-field techniques and the damage features they can best capture respectively.