Coupled Heating/Forming Optimization of Knitted Reinforced Composites



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Vous êtes cordialement invités à la soutenance de la thèse de :
Pancrace Johann

06 Aout 2013, 15h00

Ecole des Mines d’Albi, salle 1A22
Coupled Heating/Forming Optimization

of Knitted Reinforced Composites
Résumé

The feasibility of knitted fabric reinforcement for highly flexible composites is investigated for the thermoforming process. The composite sheets are made through compression molding before being shaped. We use thermoplastic elastomers as matrices: Thermoplastic Elastomers and Thermoplastic Olefins. The knit reinforcement is provided by jersey knitted fabrics of polyester fibers. A special attention is drawn to the quality of processed products through the thickness repartition. The knit reinforcement is suitable to improve the latter. Several deformation modes are studied and different behaviors are observed: uniaxial traction, pure shear and biaxial inflation. The interface between the matrix and the reinforcement is a major driver of flexible composite deformations. The IR heating is used to soften the composite prior shaping. The IR heating may be improved in terms of efficiency and cost. The relations between the emitter localizations and temperatures are particularly studied. Simulations of both the IR heating and the deformation or shaping phases are proposed. Hyperelasticity is treated and used for simulation purposes.


Mots-Clés: Thermoforming, Knitted Fabric, Infrared Heating, Thermoplastic Elastomers, Flexible Composites
Etablissements d’inscription : Ecole des Mines d’Albi, ICA Albi / Lehigh University
Composition du Jury:

Prof. Fabrice Schmidt, Committee Chairman and Dissertation Advisor

Ecole des Mines, ICA Albi



Prof. Herman N. Nied, Dissertation Advisor

Lehigh University, Department of Mechanical Engineering and Mechanics



Prof. Yannick LeMaoult, Dissertation Advisor

Ecole des Mines, ICA Albi



Prof. Raymond A. Pearson

Lehigh University, Department of Material Science and Engineering



Prof. Phillipe Boisse

INSA Lyon



Prof. John P. Coulter

Lehigh University, Department of Mechanical Engineering and Mechanics



Prof. Philipe Olivier

University of Toulouse



Prof. Arkady Voloshin

Lehigh University, Department of Mechanical Engineering and Mechanics

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