Amorçage de fissures par fatigue-contact

Abstract : The present thesis is a contribution to the knowledge of the shelling process caused by a contact fatigue. This phenomenon appears under a surface submitted to a quasi punctual loading and initiates at an inclusion which is the most probable site for crack initiation. The direction of propagation is associated with the stress distribution resulting from a complex loading. To understand this phenomenon, we present : a bibliographical study to collect the different works related to stress concentration, crack initiation criteria and the stress distribution in the vicinity of a defect. An experimental study for the simulation of crack initiation under the three modes of loading. A finite element calculation from which we have derived new initiation criteria. We have shown that they best fit the experimental results by comparison with those given in the literature
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Tawfik Tamine. Amorçage de fissures par fatigue-contact. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ018S⟩. ⟨tel-01776046⟩

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