Simulation of crystallization evolution of polyoxymethylene during microinjection molding cycle
Journal article, 2020
A mathematical model coupled with a numerical investigation of the evolving material properties due to thermal and flow effects and in particular the evolution of the crystallinity during the full microinjection molding cycle of poly (oxymethylene) POM is presented using a multi-scale approach. A parametric analysis is performed, including all the steps of the process using an asymmetrical stepped contracting part. The velocity and temperature fields are discussed. A parabolic distribution of the velocity across the part thickness, and a temperature rise in the thin zone toward the wall have been obtained. It is attributed to the viscous energy dissipation during the filling phase, but also to the involved characteristic times for the thermal behavior of the material. Depending on the molding conditions and the locations within the micro-part, different evolution of crystallization rates are obtained leading to at least three to five morphological layers, obtained in the same part configuration of a previously work, allowing a clear understanding of the process-material interaction.
morphology
microinjection molding
computer modeling
viscous dissipation
crystallization kinetics
Author
Benayad Anass
Université de Lyon
Universite Sidi Mohamed Ben Abdellah
Chouaib Doukkali University
Boutaous M'hamed
Université de Lyon
El Otmani Rabie
Chouaib Doukkali University
El Hakimi Abdelhadi
Universite Sidi Mohamed Ben Abdellah
Touache Abdelhannid
Universite Sidi Mohamed Ben Abdellah
Kamal R. Musa
McGill University
Derdouri Salim
National Research Council Canada
Zakariaa Refaa
Chalmers, Architecture and Civil Engineering, Building Technology
Siginer Dennis
University of Santiago, Chile
Botswana International University of Science and Technology
Polymers for Advanced Technologies
1042-7147 (ISSN) 1099-1581 (eISSN)
Vol. 31 4 838-852Subject Categories
Other Physics Topics
Other Materials Engineering
Condensed Matter Physics
DOI
10.1002/pat.4819