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Propagation de fissures en fatigue oligocyclique multiaxiale à haute température pour le superalliage HAYNES® 188

Abstract : This study is concerned with the SEMAFOR (ANR-14-CE07-0037) project in collaboration with ONERA, Mines ParisTech,LMT Cachan and Safran. In very high temperature condition, as found for some engine aircraft components, crack couldinitiate near perforated zones. Once a crack is initiated, further degradation by crack growth is the result of a complex setof phenomena: multiaxial fatigue loading, thermal gradients and large scale yielding under oxidizing environment. The purpose of this study is to analyse the fatigue crack growth of the superalloy HAYNES® 188 under such conditions wit hbiaxial tests. The design of an original experiment is a challenging issue to conduct biaxial tests at high temperature. A specific inductor (pancake) was designed to decrease thermal gradient within the gage length. Subsequent thermalfield has been measured using Infra-red thermography. An experimental methodology was developped to ensure a deep analysis of the crack growth. One of our major purpuse is the determination of the experimental fatigue crack growth rate in such conditions. A finite element numerical analysis was achieved using a post-processing methodology based onenergy partition. This model has been successfully validated, at first without crack insertion, for cruciform specimen tests with neither modification of the model constitutive parameters. Using consistent remeshing tools, crack propagation was modeled by explicit introduction of the crack observed experimentally. This approach leads to analyze the mechanical quantities controlling the fatigue crack growth under large scale yielding at high temperature, in order to establish tools for3D modeling of explicit crack propagation.
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Submitted on : Monday, March 23, 2020 - 5:26:24 PM
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  • HAL Id : tel-02515963, version 2

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Mariem Trabelsi. Propagation de fissures en fatigue oligocyclique multiaxiale à haute température pour le superalliage HAYNES® 188. Matériaux. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEM952⟩. ⟨tel-02515963v2⟩

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