Temperature and filler effects on the relaxed response of filled rubbers: Experimental observations on a carbon-filled SBR and constitutive modeling

Abstract : The self-heating temperature of filled rubbers under cyclic loading at environmental conditions is well-known. This increase in temperature seriously affects the constitutive stress–strain behavior by producing a thermal softening of the rubber compound. Although this feature is well-recognized and considered as important to its function, few constitutive thermo-mechanical models attempt to quantify the stress–temperature relationship. In this work, a physically-based model is developed to describe the large strain relaxed response of filled rubbers over a wide range of temperatures. The non-linear mechanical behavior is described via a Langevin formalism in which the temperature and filler effects are, respectively, included by a network thermal kinetics and an amplification of the first strain invariant. Experimental observations on the relaxed state of styrene-butadiene rubber hourglass-shaped specimens with a given carbon-black content are reported at different temperatures. A hybrid experimental–numerical method is proposed to determine simultaneously the local thermo-mechanical response and the model parameters. In addition, the predictive capability of the proposed constitutive thermo-mechanical model is verified by comparisons with results issued from micromechanical simulations containing different arrangements of the microstructure. The results show that the model offers a satisfactory way to predict the relaxed response of filled rubbers at different temperatures.
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https://hal.archives-ouvertes.fr/hal-01120998
Contributor : Marie-Christine Nodot <>
Submitted on : Friday, February 27, 2015 - 10:40:25 AM
Last modification on : Friday, July 26, 2019 - 9:22:02 AM

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Cristian Manuel Ovalle Rodas, Fahmi Zaïri, Moussa Nait-Abdelaziz, Pierre Charrier. Temperature and filler effects on the relaxed response of filled rubbers: Experimental observations on a carbon-filled SBR and constitutive modeling. International Journal of Solids and Structures, Elsevier, 2015, 58, pp.309-321. ⟨10.1016/j.ijsolstr.2014.11.001⟩. ⟨hal-01120998⟩

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