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Etude de l'effet de surcharges sur la tenue en fatigue à grande durée de vie d'un acier ferrito-bainitique sous chargement d'amplitude variable

Abstract : Automotive frame components are designed against fatigue crack nucleation under variable amplitude service loadings. These so-called service loadings correspond to the High-Cycle-Fatigue (HCF) domain, however overloads corresponding to the Low-Cycle-Fatigue (LCF) domain may occur in the car life (pavement climbing at high speed). The investigation of the effects of overloads on the HCF strength (from 105 to 107 cycles) is the goal of this study. From an industrial point of view, the final objective is to develop new fatigue design method able to take into account the LCF/HCF interaction. A database has been established thanks to fatigue tests carried out on notched specimens made of a ferritic-bainitic steel under variable and constant amplitude loadings with and without overloads. The specimen geometry (Kt=2,5) as well as the steel are representative of automotive structures like suspension arms. These tests revealed an armful effect of the overloads on the HCF fatigue strength, especially for the fully reversed tension loading (R
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https://pastel.archives-ouvertes.fr/pastel-00005937
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Thursday, June 17, 2010 - 8:00:00 AM
Last modification on : Friday, October 23, 2020 - 4:38:33 PM
Long-term archiving on: : Monday, September 20, 2010 - 5:21:43 PM

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Hadrien Bidouard. Etude de l'effet de surcharges sur la tenue en fatigue à grande durée de vie d'un acier ferrito-bainitique sous chargement d'amplitude variable. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2009. Français. ⟨NNT : 2009ENAM0007⟩. ⟨pastel-00005937⟩

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