EFFECT OF ELONGATIONAL VISCOSITY ON DIE DESIGN FOR PLASTIC EXTRUSION

摘要

A finite element simulation of the flow in a rectangular die with an abrupt contraction is presented. Effect of shear and elongational viscosities of a polymer on the flow in the die is analyzed. The shear and elongational viscosities are represented by a truncated power-law model. The power-law indices for the planar and axisymmetric elongational viscosities are found to have significant effect on the pressure and velocity fields in the die.