Rapid processing of net-shape thermoplastic planar random composite preforms (2009)
Jespersen, S. T., Baudry, F., Schmäh, D., D.Wakeman, M., Michaud, V., Blanchard, P., ...
A novel thermoplastic composite preforming and moulding process is investigated to target cost issues in textile composite processing associated with trim waste, and the limited mechanical properties...
Hybrid glass mat reinforced polypropylene-montmorillonite nanocomposites (2009)
Houphouet-Boigny, C., Plummer, C. J. G., Dalle Vacche, S., Michaud, V., Wakeman, M. D., Månson, J.-A. E.
Polypropylene/montmorillonite (iPP/MMT) has been investigated as an alternative to iPP as a matrix for glass mat thermoplastic (GMT) composites. The melt viscosity increased significantly on MMT...
I. El Haddad, Y. Liu, L. Nieto-Gligorovski, V. Michaud, B. Temime-Roussel, E. Quivet, ...
The fate of methacrolein in cloud evapo-condensation cycles was experimentally investigated. To this end, aqueous-phase reactions of methacrolein with OH radicals were performed (as described in Liu...
V. Michaud, I. El Haddad, Y. Liu, K. Sellegri, P. Laj, P. Villani, ...
The hygroscopic and volatility properties of SOA produced from the nebulization of solutions after aqueous phase photooxidation of methacrolein was experimentally studied in laboratory, using a...
I. El Haddad, Yao Liu, L. Nieto-Gligorovski, V. Michaud, B. Temime-Roussel, E. Quivet, ...
The fate of methacrolein in cloud evapo-condensation cycles was experimentally investigated. To this end, aqueous-phase reactions of methacrolein with OH radicals were performed (as described in Liu...
V. Michaud, I. El Haddad, Yao Liu, K. Sellegri, P. Laj, P. Villani, ...
The hygroscopic and volatility properties of secondary organic aerosol (SOA) produced from the nebulization of solutions after aqueous phase photooxidation of methacrolein was experimentally studied...
Ice nucleation of soot particles with variable organic and sulphuric acid coating. (2009)
Möhler, O., Benz, S., Buchholz, A., Crosier, J., Henning, S., Leisner, T., ...
European Aerosol Conf.(EAC 2009), Karlsruhe, September 6-11, 2009
Jespersen, S., Wakeman, M. D., Cramer, D., Michaud, V., Månson, J.-A. E.
An impregnation model has been developed to evaluate the infiltration phenomena that occur during a novel near net shape preforming method. This process comprises automated deposition of...
De Oliveira, R., Lavanchy, S., Chatton, R., Constantini, D., Michaud, V., ...
The influence of the mould material on the build-up of internal stresses during autoclave cure of carbon fibre composites was investigated using embedded optical fibre Bragg gratings. Unidirectional...
Embedded Shape-Memory Alloy Wires for Improved Performance of Self-Healing Polymers (2008)
Kirkby, E., Rule, J. D., Michaud, V., Sottos, N. R., White, S. R., Månson, J.-A. E.
We report the first measurements of self-healing polymers with embedded shape memory alloy (SMA) wires. The addition of SMA wires shows improvements of healed peak fracture loads by up to a factor of...
De Oliveira, R., Lavanchy, S., Chatton, R., Costantini, D., Michaud, V., Salathe, R., ...
The influence of the mould material on the build-up of internal stresses during autoclave cure of carbon fibre composites was investigated using embedded optical fibre Bragg gratings. Unidirectional...
Transverse permeability of chopped fibre bundles with an elliptical cross-section (2007)
Merhi, D., Michaud, V., Kämpfer, L., Vuilliomenet, P., Månson, J.-A. E.
The out-of-plane permeability of 25 mm-long chopped glass fibre bundle beds was measured. These bundles, used in sheet moulding compound (SMC) composites, have an elliptical cross-section with the...
On measuring wettability in infiltration processing (2007)
Capillary pressures encountered in composite processing are often evaluated by measuring infiltration rates as a function of applied pressure. Such data are generally interpreted assuming slug-flow....
Pax, G. M., Bouchet, J., Bulliard, X., Michaud, V., Månson, J-A.E.
Epoxy-functionalised hyperbranched polymers (HBP) were combined with aminosilanes to form coatings and their effect on the practical adhesion between galvanised steel and polyethylene was...
Dumont, P., Orgéas, L., Michaud, V., Favier, D., Le Corre, S., ...
Highly concentrated planar fibre-bundle suspensions with a transparent PMMA matrix were processed with various initial bundle contents and orientations. They were submitted to simple compression and...
Low-Profile mechanisms in a PVAc/polyester blend (2006)
Bulliard, X., Michaud, V., Månson, J.-A. E.
The different steps associated with the curing of a PVAc/polyester blend are identified and correlated to the mechanism of shrinkage control in the presence of a low-profile additive (LPA)....
Clifford, S., Jansson, N., Ju, W., Michaud, V., Månson, J.-A. E.
A design tool able to predict the residual stress state and dimensional stability of large complex shaped composite parts has been developed. It is based on a finite element model, using a...
Dynamic capillary effects in liquid composite moulding with non-crimp fabrics (2006)
Verrey, J., Michaud, V., Månson, J.-A. E.
A technique is presented to measure the capillary pressure drop DPg during infiltration of non-crimp fabrics by a liquid matrix. Three types of liquids are used: polyethylene glycol (PEG) dissolved...
Manufacturing cost comparison of thermoplastic and thermoset RTM for an automotive floor pan (2006)
Wakeman, M. D., Verrey, J., Michaud, V., Månson, J.-A. E.
Two resin transfer moulding (RTM) processes have been examined for automotive body-in-white (BIW) structures. An epoxy system was compared with a novel reactive polyamide 12 (PA12) system via...
Formation of aminosilane-oxide interphases (2006)
Bouchet, J., Pax, G. M., Leterrier, Y., Michaud, V., Månson, J.-A. E.
The aim of this work is to understand the interactions and interphase formation mechanisms between a liquid aminosilane oligomer (γ -APS) and glass, steel or gold surfaces as a function of the pH of...
Tailoring of the practical adhesion between polyethylene and galvanised steel (2006)
Pax, G. M., Bouchet, J., Michaud, V., Månson, J.-A.E.
Abstract—The practical adhesion of maleic anhydride grafted polyethylene (MAH-PE) to galvanised steel was studied using 3-point flexure tests, before and after hydrothermal ageing. Before bonding,...
Reaction-Induced Phase Separation in Poly(vinyl acetate)/ Polyester Blend (2006)
Bulliard, X., Michaud, V., Månson, J.-A.E.
In blends of unsaturated polyester (UP), poly (vinyl acetate) (PVAc), and styrene, a reaction-induced phase separation occurs upon curing that is due to the crosslinking between styrene and the UP...
Mehri, D., Michaud, V., Comte, E., Månson, J.-A. E.
The effect of sizing on bending rigidity in fibre bundles was investigated. Particular attention was paid to the effect of film formers and anti-static agents on the behaviour of glass fibre bundles...
Dynamic properties of sandwich structures with integrated shear-thickening fluids (2006)
Fischer, C., Braun, S. A., Michaud, V., Plummer, C. J. G., Månson, J.-A. E.
The integration of shear-thickening fluids (STFs) into composite structures has been investigated with the aim of tuning part stiffness and damping capacity under dynamic deformation. Results from...
In situ strain and temperature monitoring of adaptive composite materials (2006)
Costantini, D. M., Limberger, H. G., Salathé, R. P., Michaud, V.
An optical fiber sensor is designed to simultaneously measure strain and temperature in an adaptive composite material. The sensor is formed by splicing two fiber Bragg gratings (FBGs) close to each...
Void Formation And Transport During SMC Manufacturing: Effect Of The Glass Fibre Sizing (2006)
Comte, E., Merhi, D., Michaud, V., Månson, J.-A. E.
The present study investigates the origin of voids in sheet molding compounds (SMCs) sheets and their transport during the manufacturing steps. Paste mixing, impregnation, thickening, and molding...
In situ strain and temperature monitoring of adaptive composite materials (2006)
Yoon, H. J., Costantini, D. M., Limberger, H. G., Salathe, R. P., Kim, C. G., Michaud, V.
Balta, J. A., Bosia, F., Michaud, V., Dunkel, G., Botsis, J., Månson, J.-A. E.
This paper describes the production of an adaptive composite by embedding thin pre-strained shape memory alloy actuators into a Kevlar-epoxy host material. In order to combine the activation and...
Bulliard, X., Michaud, V., Berg, J. C., Månson, J.-A. E.
The evolution of morphology of reactive thermoplastic/unsaturated polyester blends at the surface of glass fibers is investigated during curing. The study focuses on two different types of...
Bulliard, X., Michaud, V., Ramrus, D. A., Berg, J. C., Månson, J.-A. E.
A study of the microstructure developing at the surface of glass fibers in a poly(vinyl acetate) (PVAc)/polyester blend is presented. Three different experimental methods are used: a technique based...
Mehri, D., Comte, E., Michaud, V., Månson, J.-A. E.
The correlation between sizing formulation, bundle mechanical characteristics, and bundle-matrix static and dynamic interactions are investigated. Two glass-fiber sizing formulations are considered,...
Resin transfer moulding of anionically polymerized polyamide 12 (2005)
Michaud, V., Zingraff, L., Verrey, J., Månson, J.-A. E.
Liquid composite moulding of Lactam 12 monomer and activating system (APLC12) into satin weave carbon fabrics is investigated, with emphasis on minimising the void content in the final part. The main...
Verrey, J., Winkler, Y., Michaud, V., Månson, J.-A. E.
The present work aims to enhance the interlaminar toughness of carbon/epoxy composites produced by RTM by modifying the resin with hyperbranched polymers (HBPs). A HBP content of 7.5% in the resin...
Deconsolidation in glass mat thermoplastic composites : Analysis of the mechanisms (2005)
Wolfrath, J., Michaud, V., Månson, J.-A. E.
During reheating and post-processing of thermoplastic-based composites, deconsolidation is often observed: the volume fraction fibre decreases and the void content increases. In this article, the...
Graded glass mat reinforced polypropylene (2005)
Wolfrath, J., Michaud, V., Månson, J.-A. E.
In the impregnation process, when pressure is applied, the dry fiber preform is first compressed and then unloads as the matrix flows within the pores. It has been shown earlier that for glass...
Wolfrath, J., Michaud, V., Månson, J.-A. E.
The influence of the initial configuration of glass mat and polypropylene on the deconsolidation during post-processing of the resulting composite is investigated. Deconsolidation experiments of a...
Yoon, H. J., Costantini, D. M., Michaud, V., Limberger, H. G., Manson, J. A., Salathe, R. P., ...
An optical fiber sensor to simultaneously measure strain and temperature was designed and embedded into an adaptive composite laminate which exhibits a shape change upon thermal activation. The...
Teil, H., Page, S. A., Månson, J.-A. E., Michaud, V.
The curing reaction of an epoxy resin [diglycidyl ether of bisphenol A (DGEBA)] combined with a methyl-hexahydrophtalic anhydride (MHHPA) hardener and a benzyldimethylamine (BDMA) accelerator was...
Modelling and material design of SMA polymer composites (2002)
Material design has recently become one of the key topics in the development of smart adaptive composites. In particular, different material constituents of the hybrid polymer composites with...
Progress on composites with embedded shape memory alloy wires (2002)
Michaud, V, Parthenios, J, Psarras, GC, Galiotis, C, Gotthardt, R, ...
Composite materials containing thin Shape Memory Alloy (SMA) wires show great promise as materials able to adapt their shape, thermal behaviour or vibrational properties during service. Tools for...
Eom, Y. S., Boogh, L., Michaud, V., Månson, J.-A. E.
The development of internal stress during cure of epoxy and hyperbranched polymer- modified epoxy resins was characterized, taking into account the evolving viscoelastic properties, the volumetric...
Progress on Composites with Embedded Shape Memory Alloy Wires (2002)
Schrooten, J., Michaud, V., Parthenios, J., Psarras, G. C., Galiotis, C., Gotthardt, R., ...
Embedded Shape Memory Alloys Confer Aerodynamic Profile Adaptivity (2001)
Balta, J. A., Simpson, J., Michaud, V., Månson, J.-A. E., Schrooten, J.
A structure and property based process window for void free thermoset composites (2001)
Eom, Y., Boogh, L., Michaud, V., Månson, J.-A. E.
A process window providing guidelines to minimize internal stress levels and to prevent void formation during cure of thermoset composite materials is presented. A model taking into account the...
Eom, Y., Boogh, L., Michaud, V., Sunderland, P., Månson, J.-A. E.
During cure of epoxy resins, polymerization induces an increase in mechanical properties, which is accompanied by a volumetric shrinkage. When the resin is cured in a constrained mold to which it...
Impregnation of compressible fiber mats with a thermoplastic resin, Part I: Theory (2001)
In many cases of composite processing by liquid matrix impregnation, the fiber reinforcement is compressed when it comes in contact with the liquid and then relaxes as the matrix flows within its...
Impregnation of compressible fiber mats with a thermoplastic resin, Part II: Experiments (2001)
Michaud, V., Törnqvist, R., Månson, J.-A. E.
transverse direction is investigated with application to the Glass Mat reinforced Thermoplastics (GMT) lamination process in a double belt press.Amodel proposed in Part I to simulate the kinetics of...
Adaptive composites with embedded shape memory alloys (2001)
Parlinska, M., Clech, H., Balta, J. A., Michaud, V., Månson, J.-A. E., ...
Vibrational response of adaptive composites (2001)
Parlinska, M., Clech, H., Balta, J. A., Michaud, V., Månson, J.-A. E., ...
A model for the consolidation of warp-knitted reinforced laminates (2001)
Rozant, O., Michaud, V., Månson, J.-A. E.
A model for the consolidation of thermoplastic composites reinforced with a warpknitted fabric was developed. The evolution of void content during composite consolidation achieved via film stacking...
The packing stress of impregnated fiber mats (2001)
Servais, C., Michaud, V., Månson, J.-A. E.
The parameters affecting the packing stress of fiber mats for melt impregnation, resin transfer molding and compression molding are systematically investigated. An analytical equation based on local...
Infiltration processing of fibre reinforced composites: governing phenomena (2001)
All three classes of fibre reinforced composite materials (polymer, metal and ceramic matrix) may be produced by flow of liquid matrix into the open spaces left within pores of a fibre preform. Even...
Eom, Y. S., Boogh, L., Michaud, V., Sunderland, P., Månson, J.-A. E.
The relative sequence of shrinkage and evolution of modulus of a thermoset resin during cure leads to the build-up of internal stresses, especially if the resin is constrained by the presence of...
In-situ strain measurement in adaptive composites using fibr bragg gratin sensors
Michaud, V., Balta, J.A., Bosia, F., Botsis, J., Manson, J.A.-E.
Pre- and Post-Transition Behavior of Shear Thickening Fluids in oscillating Shear
Fischer, C., Michaud, V., Plummer, C. J. G., Månson, J.-A. E.
The dynamic shear-thickening behavior of concentrated colloidal suspensions of fumed silica in polypropylene glycol has been investigated. Dynamic frequency sweeps showed that, for any given solids...