Modelling of the post-yield response of glassy polymers: influence of thermomechanical history

E.T.J. Klompen, T.A.P. Engels, L.E. Govaert, H.E.H. Meijer

Research output: Contribution to journalArticleAcademicpeer-review

179 Citations (Scopus)
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Abstract

The continuous development of constitutive equations for the finite strain deformationof glassy polymers has resulted in a number of sophisticated models that can accuratelycapture the materials’ intrinsic behaviour. Numerical simulations using these modelsrevealed that the thermal history plays a crucial role in the macroscopic deformation.Generally, macroscopic behaviour is assumed not to change during a test, however, forcertain test conditions this does not hold and a relevant change in mechanical properties,known as physical ageing, can be observed. To investigate the consequences ofthis change in material structure, the existing models are modified and enhanced by incorporatingan ageing term and its parameters are determined. The result is a validatedconstitutive relation that is able to describe the deformation behaviour of, in our case,polycarbonate over a large range of molecular weights and thermal histories, with oneparameter set only.
Original languageEnglish
Pages (from-to)6997-7008
JournalMacromolecules
Volume38
Issue number16
DOIs
Publication statusPublished - 2005

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