Modelling of residual stresses in compression moulded glass-mat reinforced thermoplastics
2000; Elsevier BV; Volume: 31; Issue: 11 Linguagem: Inglês
10.1016/s1359-835x(00)00078-6
ISSN1878-5840
AutoresAndreas Trende, B. Tomas Åström, Gunnar Nilsson,
Tópico(s)Structural Analysis of Composite Materials
ResumoResidual stresses and dimensional changes in the compression moulded glass-mat reinforced thermoplastic (GMT) parts are investigated. A heat transfer and crystallisation model with temperature dependent matrix properties is used to obtain input to the subsequent thermal stress analysis. Both an isotropic viscoelastic and a transversely isotropic elastic material model are investigated through finite-element calculations. The results show that the elastic material model is sufficient for prediction of geometrical changes if the temperature history is symmetric through the thickness of the specimen, but insufficient for prediction of residual stresses and dimensional changes if the temperature field is not symmetric. In this case a viscoelastic material model is necessary.
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