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Comportement visco-hyperélastique endommageable d'élastomères SBR et PU : prévision de la durée de vie en fatigue

Abstract : This work aims to develop a tool for predicting the lifespan of shoe soles called for fatigue-flexion. The first part of the work consists of characterizing the mechanical behavior of two elastomeres, a silica-filled rubber and a cellular polyurethane, in order to establish a constitutive law. Uniaxial and multiaxial tests, lead us to develop a constitutive law taking into account the nonlinear elasticity to large transformations (or hyperelasticite), viscoelasticite and damage. Two viscoelastic approaches are studied: the functional approach and the internal variable approach. The laws of behavior are then identified from the simple tests (traction and compression), and validated thanks to the multiaxial tests (tests on notched axisymmetric specimens, used for fatigue tests). On the other hand, the role of silica fillers in the behavior and damage of rubber is studied through complementary tests, and in particular by in situ-meb tensile tests. The last part of the study concerns the resistance to the initiation of a fatigue crack of the loaded rubber. A campaign of tensile-compression and torsion tests on notched axisymmetric specimens is conducted. The synthesis of the results shows two critical parameters of fatigue damage: the maximum principal deformation and the amplitude of the deformations. The observation of fracture facies highlights the zones of initiation on axisymmetric test pieces. These zones correspond either to zones of silica segregation or to a surface defect.
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Submitted on : Thursday, March 22, 2018 - 11:32:40 AM
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  • HAL Id : tel-01727666, version 1

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Agathe Robisson. Comportement visco-hyperélastique endommageable d'élastomères SBR et PU : prévision de la durée de vie en fatigue. Mécanique des matériaux [physics.class-ph]. Ecole des Mines de Paris, 2000. Français. ⟨tel-01727666⟩

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