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Structures élastomères sous chargement cyclique : comportement, fatigue, durée de vie

Abstract : The automotive industry must ensure the service life of numerous rubber components used for anti vibratory purposes. This work aims at proposing a method to predict the fatigue life of a carbon-black reinforced natural rubber structure. The approach proposed here consists in uncoupling the evolution of the mechanics behaviour and damage under cyclic loading. We make the assumption that the behaviour tends to stabilize and that the lifetime, defined as the initiation of a crack, depends only on the mechanical variables in the stabilized state. Upon cyclic loading, elastomers experience a stress-softening phenomenon known as the Mullins' effect. This phenomenon occurs mostly during the first few cycles, after which the response of the material remains unchanged by additional reloading. We propose a model to represent this stabilized state, supposed to depend only on some cyclic variables. The parameters are the maximum stretches reached in a finite number of material directions, in order to describe the anisotropy induced by the Mullins' effect. This model is used to analyse a large number of uniaxial and multixial fatigue tests realised with cylindrical dumbbell specimens. We show its ability to take into account the type of control (force or displacement) and the influence of an initial overload. The analysis of the multiaxial data indicates that the maximum principal stress is well correlated with lifetime for all types of solicitations, excepting those which involve multi-plane cumulative damage. A cumulative damage law is proposed to account for these types of loading.
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Contributor : Ida Raoult <>
Submitted on : Tuesday, September 28, 2010 - 11:31:46 AM
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  • HAL Id : tel-00521633, version 1

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Ida Raoult. Structures élastomères sous chargement cyclique : comportement, fatigue, durée de vie. Mécanique [physics.med-ph]. Ecole Polytechnique X, 2005. Français. ⟨tel-00521633⟩

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