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A viscoelastic-viscoplastic-damage constitutive model based on a large strain hyperelastic formulation for amorphous glassy polymers
Nguyen, Van Dung; Morelle, Xavier; Lani, Frédéric et al.
2015In proceedings of the 20th International Conference on Composite Materials, Copenhagen, Denmark, 19-24th July 2015
 

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Keywords :
Hyperelastic; Viscoelasticity; Viscoplasticity; Saturation damage; Glassy polymers
Abstract :
[en] The aim of this work is to develop an efficient large-strain hyperelastic constitutive model for amorphous polymers in the glassy state. These materials exhibit a complex rate- and pressure-sensible behavior in both elastic and plastic regimes. After an initial linear elastic region, a nonlinear stage continues until reaching a peak stress, which is followed by a softening stage. At large strains, when the softening is saturated, a re-hardening stage is reached. The viscoelastic effect is captured using the generalized Maxwell model. The viscoplastic effect is considered using a Perzyna-type flow rule incorporating a pressure sensitive yield surface and a non-associated flow potential. This yield surface is extended from the Drucker-Prager one. The saturated softening phenomenon is modelled using an isotropic numerical damage variable progressed by a saturated softening law. With the introduction of the damage parameter, a non-local implicit gradient damage model is used to avoid the loss of the solution uniqueness. Through experimental comparisons, it is shown that the proposed model has the ability to model the complex mechanical responses of amorphous glassy polymers.
Disciplines :
Materials science & engineering
Aerospace & aeronautics engineering
Mechanical engineering
Author, co-author :
Nguyen, Van Dung  ;  Université de Liège > Département d'aérospatiale et mécanique > Computational & Multiscale Mechanics of Materials (CM3)
Morelle, Xavier;  Université Catholique de Louvain - UCL
Lani, Frédéric;  Université Catholique de Louvain - UCL
Pardoen, Thomas;  Université Catholique de Louvain - UCL
Bailly, Christian;  Université Catholique de Louvain - UCL
Noels, Ludovic  ;  Université de Liège > Département d'aérospatiale et mécanique > Computational & Multiscale Mechanics of Materials (CM3)
Language :
English
Title :
A viscoelastic-viscoplastic-damage constitutive model based on a large strain hyperelastic formulation for amorphous glassy polymers
Publication date :
20 July 2015
Event name :
20th International Conference on Composite Materials (ICCM20)
Event place :
Copenhagen, Denmark
Event date :
19-24 July, 2015
Audience :
International
Main work title :
proceedings of the 20th International Conference on Composite Materials, Copenhagen, Denmark, 19-24th July 2015
Name of the research project :
The author gratefully acknowledge the financial support from F. R. S. – F. N. R. S. under the project number PDR T.1015.14.
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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