Flow-fiber coupled injection molding simulations with non-uniform fiber concentration effects

Tianyi Li (1) , Jean-François Luyé (1)

1 Promold

We propose to account for non-uniform fiber concentration effects in a novel fiber-flow coupled injection molding simulation framework. The rheological properties of fiber suspensions are characterized by an optimal scalar viscosity defined by a minimization principle. Comprehensive theoretical analyses are carried out to gain further physical insights into this approximate orientation-dependent model. The flow-induced fiber orientation and migration are numerically computed and then injected into the constitutive equation at every time-step. Based on careful post-processing of the obtained kinematics and fiber evolution, simulation results on a center-gated disk suggest a stronger coupling behavior due to a spatially-varying concentration. This multiphysics coupling leads to a further improvement in terms of fiber orientation prediction compared with experimental results.

Mots clés: Fiber orientation; Fiber concentration; Anisotropy; Multiphysics coupling; Injection molding simulation

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Tianyi Li, Jean-François Luyé. Flow-fiber coupled injection molding simulations with non-uniform fiber concentration effects. 2018. ⟨hal-01958510⟩