Numerical Simulation of Flow-Induced Birefringence in Injection Molded Disk

  • Lee H. S. (Chungju National University) ;
  • Shyu G. D. (The University of Akron) ;
  • Isayev A. I. (The University of Akron)
  • Published : 2003.04.01


This study is an attempt to understand the birefringence and stress development in an injection molded disk. A computer code was developed to simulate all three stages of the injection molding process - filling, packing and cooling by finite element method. The constitutive equation used here was compressible Leonov model. The PVT relationship was assumed to follow the Tait equation. The flow-induced birefringence was related to the calculated flow stresses through the linear stress-optical law. The predicted birefringence was in good agreement with the experimental results.