VOID PREDICTION DURING LIQUID COMPOSITE MOLDING PROCESSES: WETTING AND CAPILLARY PHENOMENA

Mohamed Amine Ben Abdelwahed (1) , Yanneck Wielhorski (1) , Laurent Bizet (1) , Joël Bréard (1)

1 LOMC - Laboratoire Ondes et Milieux Complexes

The aim of this work is to contribute in improving fibrous preforms impregnation for Liquid Composite Molding (LCM) processes. The void prediction in LCM sparks off interest within the Composite Material elaboration because it represents a significant issue to keep the expected mechanical properties of the final product. The liquid properties, the preform geometry and the flow conditions impact the void or bubble entrapped inside and outside the yarns. Nevertheless, due to the complex geometry of the reinforcement, experimental characterization of bubble formation remains delicate. Thus, our study deals with two simple model networks representing connected pores so called "Pore Doublet Model". A first is considering two capillaries converging on a node (T-junction) and a second is representing two capillaries interconnected with a supplying principle. In this paper, we emphasize on microfluidic and millifluidic approaches where wetting and capillary forces are significant during bubble formation mechanism.

Mots clés: LCM; Bubble; Pore Doublet Model; Millifluidic

Domaines: Matériaux; Génie des procédés; Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Mohamed Amine Ben Abdelwahed, Yanneck Wielhorski, Laurent Bizet, Joël Bréard. VOID PREDICTION DURING LIQUID COMPOSITE MOLDING PROCESSES: WETTING AND CAPILLARY PHENOMENA. 15TH EUROPEAN CONFERENCE ON COMPOSITE MATERIALS, Jun 2012, Venise, Italy. ⟨hal-00718684⟩