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Isaad J.,University of Lille Nord de France | Salaun F.,French National Graduate School of Textile Engineering
Sensors and Actuators, B: Chemical | Year: 2011

New poly (vinyl alcohol) (PVA) derivative containing pendant chemoselective functionality is prepared for the cyanide detection in pure water. Particularly, incorporation of the chemodosimeter 4 on PVA is performed by direct coupling of the hydroxyl group of the dye 4 and PVA hydroxyl groups via ethereal linkage using di-bromoalkane as a cross-linking agent. The chemosensory capacity of the polymeric material for the colorimetric sensing of cyanide in water is based on the reactivity of this anion toward the chemodosimeter, and its water solubility is given by PVA moiety. The chemodosimeter is developed on the basis of the trifluoroacetyl group as electrophile receptor of the cyanide anions. The final water soluble functionalized polymer presents a sensible selectivity toward cyanide anions in pure water. © 2011 Elsevier B.V. All rights reserved. Source

Thomassey S.,University of Lille Nord de France | Thomassey S.,French National Graduate School of Textile Engineering
International Journal of Production Economics | Year: 2010

Like many others, Textileapparel companies have to deal with a very competitive environment and have to manage consumers which become more demanding. Thus, to stay competitive, companies rely on sophisticated information systems and logistic skills, and especially accurate and reliable forecasting systems. However, forecasters have to deal with some singular constraints of the textileapparel market such as for instance the volatile demand, the strong seasonality of sales, the wide number of items with short life cycle or the lack of historical data. To respond to these constraints, companies have implemented specific forecasting systems often simple but robust. After the study of existing practices in the clothing industry, we propose different forecasting models which perform more accurate and more reliable sales forecasts. These models rely on advanced methods such as fuzzy logic, neural networks and data mining. In order to evaluate the benefits of these methods for the supply chain and more especially for the reduction of the bullwhip effect, a simulation based on real data of sourcing and forecasting processes is performed and analyzed. © 2010 Elsevier B.V. All rights reserved. Source

Boussu F.,French National Graduate School of Textile Engineering
Textile Research Journal | Year: 2011

The actual and near future trend in the composite field is to customize material in response to its application. One of these solutions may lie in the use of three-dimensional textile structure using different types of high performance yarn. Focusing on the 3D textile structure literature, different types of classification can be found. 1,2 Among these different kinds of structure, the warp interlock appears to be differently defined like: the 2.5 dimensions fabric, 3 dimensions multi layers fabric, multi layers interlacing fabrics.3 This paper gives an overview of the different types of the warp interlock to be defined according to their performance on delamination and impact resistances. © The Author(s) 2010. Source

Moothoo J.,University of Orleans | Allaoui S.,University of Orleans | Ouagne P.,University of Orleans | Soulat D.,French National Graduate School of Textile Engineering
Materials and Design | Year: 2014

To study the potential of flax tows in composite processing as an alternative to flax spun yarns, a flat flax tow consisting of aligned fibre bundles held together by a natural binder was used and characterised in tension under various conditions. The effect of the gauge length was studied on the dry reinforcement. The experimental results showed that the mechanical properties and failure mechanism varied significantly depending on the gauge length and are discussed in relation to the distribution of elementary fibres within the tow. A characteristic length as from which the mechanical properties are stable has been identified. At this length, the effect of the strain rate on the tensile properties was measured and their sensitivity to the strain rate suggests a viscous effect in the behaviour of the flax tow. To approach process conditions such as wet filament winding, a batch of specimens was impregnated with epoxy prior to tensile testing. The tensile properties under wet conditions were found to be close to the properties under dry conditions and shows that the tow can withstand typical processing tensions. Finally, tensile tests on cured-impregnated tows showed interesting mechanical properties for composite application. © 2013 Elsevier Ltd. Source

Wang P.,INSA Lyon | Wang P.,French National Graduate School of Textile Engineering | Hamila N.,INSA Lyon | Boisse P.,INSA Lyon
Composites Part B: Engineering | Year: 2013

Continuous Fibre Reinforced Thermoplastics (CFRTPs) have made their way into the aerospace an automotive industries as structural components. Thermoplastic composites offer many advantages over thermoset composites such as low cycle time and recyclability. The development of a thermoforming process is complex and expensive to achieve by trial/error. This can be favourably replaced by numerical analyses. A simulation approach for thermoforming of multilayer thermoplastic is presented. Each prepreg layer is modelled by semi-discrete shell elements. These elements consider the tension, in-plane shear and bending behaviour of the ply at different temperatures around the fusion point. The contact/friction during the forming process is taken into account using forward increment Lagrange multipliers. A lubricated friction model is implemented between the layers and for ply/tool friction. Thermal and forming simulations are presented and compared to experimental results. The computed shear angles after forming and wrinkles are in good agreement with the thermoforming experiment. It will be shown by the comparison of two simulations that the temperature field play an important role in the process success. © 2013 Elsevier Ltd. All rights reserved. Source

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