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Calculation of Residual Stress Development in Injection Moulding Using a Nonlinear Viscoelastic Model

Calculation of Residual Stress Development in Injection Moulding Using a Nonlinear Viscoelastic... The residual stress development in amorphous polymers iscalculated for rapid cooling under pressure during injection moulding.This is done primarily to predict the warpage and shrinkage behaviour ofcomponents. A nonlinear viscoelastic model based on the free-volumeconcept is used as a constitutive equation to describe polymerbehaviour. The cooling process in injection moulding can be divided intotwo stages: until ejection, the part is clamped into the mould, whilethe remaining cooling down to room temperature happens free ofconstraints. Both steps are calculated viscoelastically in thesimulation procedure. First, the stress profiles are determined in onematerial point of a plate-like component. In these calculations, theinfluence of different processing conditions, such as ejection time,packing pressure, or different wall temperatures, is investigated. Next,to be able to take more complex geometries into account, the nonlinearconstitutive equation is used in a commercially available finite-elementprogram. This is done by programming user-defined subroutines. Thesolution of the coupled thermal-mechanical problem allows the predictionof the residual stresses as well as the warpage and shrinkage behaviourfor components with arbitrary geometry. Finally, the calculated warpageis compared with the behaviour of an experimental component. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mechanics of Time-Dependent Materials Springer Journals

Calculation of Residual Stress Development in Injection Moulding Using a Nonlinear Viscoelastic Model

Mlekusch, B.
Mechanics of Time-Dependent Materials , Volume 5 (2) – Jun 1, 2001
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Publisher
Springer Journals
Copyright
Copyright © 2001 by Kluwer Academic Publishers
Subject
Physics; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation Materials; Mechanics
ISSN
1385-2000
eISSN
1573-2738
DOI
10.1023/A:1011495516180
Publisher site
See Article on Publisher Site

Abstract

The residual stress development in amorphous polymers iscalculated for rapid cooling under pressure during injection moulding.This is done primarily to predict the warpage and shrinkage behaviour ofcomponents. A nonlinear viscoelastic model based on the free-volumeconcept is used as a constitutive equation to describe polymerbehaviour. The cooling process in injection moulding can be divided intotwo stages: until ejection, the part is clamped into the mould, whilethe remaining cooling down to room temperature happens free ofconstraints. Both steps are calculated viscoelastically in thesimulation procedure. First, the stress profiles are determined in onematerial point of a plate-like component. In these calculations, theinfluence of different processing conditions, such as ejection time,packing pressure, or different wall temperatures, is investigated. Next,to be able to take more complex geometries into account, the nonlinearconstitutive equation is used in a commercially available finite-elementprogram. This is done by programming user-defined subroutines. Thesolution of the coupled thermal-mechanical problem allows the predictionof the residual stresses as well as the warpage and shrinkage behaviourfor components with arbitrary geometry. Finally, the calculated warpageis compared with the behaviour of an experimental component.

Journal

Mechanics of Time-Dependent Materials – Springer Journals

Published: Jun 1, 2001

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