CONSTITUTIVE RELATIONSHIPS FOR ANISOTROPIC VISCOUS MATERIALS

Constitutive relationships for anisotropic materials are considered to describe the viscous flow of fiber-reinforced, thermoplastic composit es during forming. The fully anisotropic and the orthotropic cases are first presented. The special case of a transversely isotropic viscous material, which is of particular interest to the deformation of assem blies of oriented fibers suspended in a viscous fluid, is then investi gated and the correspondence between two approaches found in the liter ature on the subject is established.