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Continuous welding modeling of thermoplastic matrix composites

Célia Nicodeau 
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 understand the physical mechanisms taking place in the APC-2 (carbon/PEEK) welding phenomenon in order to model and improve the process. The originality of the study was to develop a process thermal model at a macroscopic scale and simultaneously to deeply study phenomenon at a macromolecular scale. The 2D thermal model enables to simulate the ply consolidation whatever the process parameters. It takes into account heat transfers via conduction and convection plus melting and crystallisation phenomena whose kinetics were determined experimentally. Concerning macromolecular chains dynamics, reptation time relative to chain diffusion at the interface was approached by rheological tests. It has been shown that PEEK thermal degradation mechanism is mainly crosslinking; the crosslinking kinetics has been followed by ageing rheological tests. The coupling of these studies enables to predict the consolidation efficiency and to determine a good welding zone in the Time-Temperature process window. These simulations are compared to mechanical tests relative to the welded interface. Hence, we defined limits imposed by antagonist physical phenomena for this in-situ consolidation and understood how to ameliorate the process for a better welding.
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Contributor : Ecole Arts et Métiers ParisTech Connect in order to contact the contributor
Submitted on : Monday, December 19, 2005 - 8:00:00 AM
Last modification on : Monday, December 19, 2005 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:47:57 PM


  • HAL Id : pastel-00001506, version 1



Célia Nicodeau. Continuous welding modeling of thermoplastic matrix composites. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2005. English. ⟨NNT : 2005ENAM0018⟩. ⟨pastel-00001506⟩



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