Thermoviscoelastic simulation of thermally and pressure-induced stresses in injection moulding for the prediction of shrinkage and warpage for fibre-reinforced thermoplastics

In this paper we present a detailed thermoviscoelastic formulation for the simulation of thermally and pressure induced residual stresses in injection moulded short-fibre-reinforced thermoplastics. The computed residual stresses enable us to predict shrinkage and warpage in the finished products. We...

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Bibliographic Details
Published in:Journal of non-Newtonian fluid mechanics 1999-08, Vol.84 (2), p.159-190
Main Authors: Zheng, R., Kennedy, P., Phan-Thien, N., Fan, X-J.
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Exact sciences and technology
Fibre orientation
Forms of application and semi-finished materials
Injection moulding
Polymer industry, paints, wood
Residual stresses
Shrinkage
Technology of polymers
Warpage
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Summary:In this paper we present a detailed thermoviscoelastic formulation for the simulation of thermally and pressure induced residual stresses in injection moulded short-fibre-reinforced thermoplastics. The computed residual stresses enable us to predict shrinkage and warpage in the finished products. We also apply an anisotropic version of a rotary diffusion equation to calculate the flow-induced fibre orientation distribution. The predicted fibre orientation state, together with micromechanical theories, allows the incorporation of anisotropy in material properties into the thermoviscoelastic model. Finally we report three numerical examples to indicate the success of the present model.
ISSN:0377-0257
1873-2631
DOI:10.1016/S0377-0257(98)00148-7