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T. Azdast, A. H. Behravesh, K. Mazaheri, M. M. Darvishi

Numerical simulation and experimental validation of residual stress induced

constrained shrinkage of injection molded parts (in English)

Polimery 2008, No 4, 304


DOI: dx.doi.org/10.14314/polimery.2008.304

Summary

In this paper a numerical analysis of in-mold constrained shrinkage of injection molded parts is presented, considering the residual stresses produced during the packing and cooling stages. Residual stresses are the main reasons of shrinkage and warpage of the injected parts. In regards to the viscoelastic characteristics of polymeric materials, mold constraints have noticeable effects on the final dimensions of the molded parts. A numerical analysis was developed and experimentally examined for constrained shrinkage using a case study: a plate containing the holes (as constraints). The results indicated a good agreement between the numerical solution and the experimental data.


Key words: injection molding, shrinkage, mold constraints, residual stress, cooling time


e-mail: amirhb@modares.ac.ir


T. Azdast, A. H. Behravesh, K. Mazaheri, M. M. Darvishi

Numerical simulation and experimental validation of residual stress induced constrained shrinkage of injection molded parts (in English)