Simulation of microstructure development in injection molding of engineering plastics

Jeong S. Yu, Alan H. Wagner, Dilhan M. Kalyon

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Mathematical models were developed to predict the various microstructural properties, including birefringece, residual stress, and density distributions, in the freely quenched compression molded samples as well as in the injection molded samples. To model the birefringence distribution in the injection molded samples, the BKZ type integral constitutive equation was employed to account for the nonisothermal stress relaxation, which takes place during the cooling stage of the molding cycle. The predicted birefringence agreed well with the experimental data near the mold walls. The residual stress distribution was modeled by the existing thermoelastic theory. The residual thermal stress distribution in the freely quenched samples was predicted very well by the model. However, the predicted residual thermal stresses in the injection molded samples were much larger than the measured ones. A phenomenological model to predict the density distribution in injection molded sample is proposed by including the effects of both cooling rate and the pressure on the density development. The predicted results agreed well with the experimental data.

Original languageEnglish
Pages (from-to)477-489
Number of pages13
JournalJournal of Applied Polymer Science
Volume44
Issue number3
DOIs
StatePublished - 25 Jan 1992

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