Birefringence Distribution in gas-Assisted Tubular Injection Moldings: Simulation and experiment
Measurements and simulation of three birefringence components and of the gas/polymer interface distribution in gas-assisted injection molding (GAIM) of a tubular geometry are presented. The governing equations of the process are derived using a nonlinear viscoelastic model and solved using a hybrid finite element/finite difference/control volume method (FEM/FD/CV). The measurements were carried out on polystyrene moldings before and after annealing. Simulation and experimental results indicate that the birefringence is high in the gas penetration region and low in the region where the gas did not penetrate.
Isayev, Avraam, "Birefringence Distribution in gas-Assisted Tubular Injection Moldings: Simulation and experiment" (2007). Polymer Engineering Faculty Research. 144.