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Mise en évidence et simulation de l’endommagement des revêtements de carbone amorphe pour application moteur à combustion interne

Abstract : The use of micrometric diamond-like carbon coatings (named DLC) are becoming widely used by automotive manufacturers in order to improve the efficiency of internal combustion engines by reducing the mechanical friction losses. Although DLC coatings generally exhibit excellent tribological properties and very low wear rates, their use in internal combustion engines shows that, subject to complex loadings, many degradation modes are observable. Untimely propagation of these latter upon the entire coated surfaces is a risk to control in order to guarantee the coating function over time. From one hand, this control implies to know and to understand all DLC degradation mechanisms when applied to engine components. On the other hand, it is necessary to possess lifetime simulation tools that can be used to optimize tribological systems in their early design. The work presented in this thesis has been guided by these goals and gathers experimental analyses of DLC-coated components, numerical analyzes, simplified testing protocols and coupling analyses of degradation processes. All these topics finally lead to the definition of a lifetime simulation tool adapted to DLC coated internal combustion engine applications
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Submitted on : Friday, June 25, 2021 - 10:46:01 AM
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  • HAL Id : tel-03270749, version 1

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Geoffrey Pagnoux. Mise en évidence et simulation de l’endommagement des revêtements de carbone amorphe pour application moteur à combustion interne. Matériaux et structures en mécanique [physics.class-ph]. Université Paris-Est, 2015. Français. ⟨NNT : 2015PESC1175⟩. ⟨tel-03270749⟩

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