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Endommagement en fatigue des élastomères

Abstract : Most of the studies dealing with fatigue damage in elastomers use phenomenological approaches to predict the end of life. Indeed, damage mechanisms are not clearly established and numerous continuum mechanical quantities are proposed to measure the damage. This thesis focuses on the derivation of such a mechanical quantity based on physical considerations. For this purpose, fatigue tests were performed and specimens were examined by scanning electron microscopy, X-rays micro-tomography and atomic force microscopy. Results demonstrate that from first fatigue cycles, microscopic cracks initiate homogeneously in the bulk and grow until failure if local loading conditions are favorable. Moreover, mechanisms of fatigue crack growth were identified during scanning electron microscopy experiments. Finally, this study has shown that damage prediction at the macroscopic scale should take into account the growth of fatigue crack. The mechanical quantity proposed here is issued from configurationnal mechanics and more precisely from the momentum energy tensor so-called the Eshelby stress tensor. Compared to classical approaches, this mechanical quantity satisfactorily predicts fatigue damaged zones.
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Submitted on : Friday, January 27, 2017 - 11:47:56 PM
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  • HAL Id : tel-01448458, version 1


Jean-Benoit Le Cam. Endommagement en fatigue des élastomères. Mécanique des matériaux [physics.class-ph]. Ecole Centrale de Nantes (ECN); Université de Nantes, 2005. Français. ⟨tel-01448458⟩



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