3D Interlock Composite Preforming Simulation

• Published in: Key engineering materials 2012-01, Vol.504-506, p.261-266
• Main Authors: Morestin, Fabrice, Charmetant, Adrien, Boisse, Philippe, Otin, Stephane, Orliac, Jean Guillaume
• Format: Article
• Language: English
• Subjects: Computer simulation; Engineering Sciences; Mathematical models; Mechanics; Physics; Preforming; Resin transfer molding; Simulation; Solid mechanics; Stiffness; Three dimensional; Yarns
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.504-506.261

In order to simulate 3D interlock composite reinforcement behavior in forming processes like Resin Transfer Molding (RTM), it is necessary to predict yarns positions in the fabric during the preforming stage of the process. The present paper deals about thick 3D interlock fabric forming simulation using a specific hexahedral semi-discrete finite elements simulation tool : Plast4. Using the virtual work principle, we distinguish the virtual internal work due to tensions in yarns from other internal virtual works. The part of material stiffness relative to yarns tension is described as "first order stiffness" by a 3D discrete beam model. The rest of the rigidities - like transverse compression, shear strains or friction between yarns - are depicted by a continuous quad-based discretization designated in our work as "second order stiffness". A combination of this "first order" discrete model and a continuous orthotropic hyperelastic "second order" material formulation will enables us to simulate interlock preforming process. Jointly to the simulation work, we also had to specify and perform experimental testing identification of material's parameters. Thoses parameters concern both parts of the model. A bilinear tension approach for the yarns discrete modelization and an orthotropic continuous material for the "second order" part.