Paper number 232
|ORTHOTROPIC RHEOLOGY OF GLASS-MAT-REINFORCED THERMOPLASTICS (GMT): LUBRICATED SQUEEZING FLOW|
M. A. Dweib and C. M. Ó Brádaigh
Composites Research Unit,
Department of Mechanical Engineering,
National University of Ireland, Galway.
Tel: + 353 91 750424, Fax: + 353 91 750534
|Summary||The rheological behaviour of Glass-Mat Reinforced Thermoplastics (GMT) was studied under isothermal compression moulding conditions on a universal test machine. The anisotropic behaviour of the lubricated squeezing flow is modelled using three non-Newtonian extensional viscosities. Previous work modelled the material as transversely isotropic, resulting in two in-plane extensional viscosities. In that work, the main assumption was that the material had the same viscosity in one of the in-plane directions and through thickness. Consideration of three independent viscosities is considered necessary as a result of an extensive research study of the fibre structure and orientation of the material, which shows that the material has different fibre structures in three different directions.
||Keywords|| rheology, GMT, squeeze flow, anisotropy.
Theme : Mechanical and Physical Properties ; Creep and Viscoelastic Behaviour
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