Étude de l'apparition des contraintes résiduelles dans le procédé d'empilement par soudage et consolidation en continu de composites thermoplastiques

Abstract : The automated two placement process developed in the aircraft industry is an emerging technique for manufacturing continuous fiber-reinforced thermoplastic parts. Our objective is to model the appearance of residual stress in the process. The originality of the study was to develop a multi-scale and multi-physics numerical modeling allowing a coupling between the two scales in order to model the residual stress appearance during the process. The microscopic level, which is described by the constrained natural elements method (CNEM), provides the macroscopic scale the thermomechanical properties of the homogenized material at each time step. The macroscopic scale provides the microscopic scale the boundary conditions (temperatures, displacements), which allow to determine the temperature, strain and stress microscopic fields during the process. The results in terms of validation and implementation of the method to the automated two placement process are satisfactory and promising. The developed numerical method can moreover be easily applied to other types of forming processes of thermoplastic composites.
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Submitted on : Friday, September 10, 2010 - 1:42:39 PM
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François Lemarchand. Étude de l'apparition des contraintes résiduelles dans le procédé d'empilement par soudage et consolidation en continu de composites thermoplastiques. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2008. Français. ⟨NNT : 2008ENAM0034⟩. ⟨pastel-00004574⟩

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