Prestrain-dependent viscosity of a highly filled elastomer: experiments and modeling

Abstract : Highly filled elastomers exhibit a complex microstructure made up of rigid fillers bounded by a thin layer polymeric matrix. The interactions between the fillers and the binder amplify locally the applied strains and induce a nonlinear viscoelastic behavior. The aim here is to analyze the influence of prestrain on the viscoelastic behavior. This paper proposes a prestrain-dependent viscoelastic constitutive model. The model is a superposition of three relaxation spectra, each corresponding to a family of polymer chains, and can be regarded in either its continuous or discrete expression. More specifically, one of these relaxation spectra is modified to assure the prestrain sensitivity. The parameters of the discrete model are identified from relaxation and DMA experiments performed on a solid propellant, and the obtained predictions match closely the experiments. The novelty of the analysis proposed in this paper is threefold. On the one hand, we report a new series of experimental measures, performed for a large range of frequencies for the DMA experiment and relaxation times for the relaxation experiment, and, on the other hand, we propose a constitutive law compatible with the principles of thermodynamics, which predicts closely the measurements. Finally, the analysis is performed comparing both relaxation and DMA experiments using the spectrum of relaxation times. A peculiarity of the present discussion is the novel identification method used, which identifies directly the relaxation times. This technique leads to models with smaller and optimum numbers of parameters than classical methods based on a logarithmic distribution of relaxation times.
Type de document :
Article dans une revue
Mechanics of Time-Dependent Materials, Society for Experimental Mechanics, 2015, 19 (3), 〈http://link.springer.com/article/10.1007/s11043-015-9262-z〉. 〈10.1007/s11043-015-9262-z〉
Liste complète des métadonnées

https://hal-polytechnique.archives-ouvertes.fr/hal-01219736
Contributeur : Andrei Constantinescu <>
Soumis le : vendredi 23 octobre 2015 - 10:43:09
Dernière modification le : jeudi 11 janvier 2018 - 06:18:29

Identifiants

Citation

D. Jalocha, A. Constantinescu, R. Neviere. Prestrain-dependent viscosity of a highly filled elastomer: experiments and modeling. Mechanics of Time-Dependent Materials, Society for Experimental Mechanics, 2015, 19 (3), 〈http://link.springer.com/article/10.1007/s11043-015-9262-z〉. 〈10.1007/s11043-015-9262-z〉. 〈hal-01219736〉

Partager

Métriques

Consultations de la notice

159