Effects of LCF Loadings on the HCF Life of Notched Specimens in Ferritic-Bainitic Steel
Article dans une revue avec comité de lecture
Résumé
Fatigue tests were performed on ferritic bainitic steel notched specimens (Kt = 2.5) under load controlled constant amplitude loading. These tests show that under constant amplitude tension compression loading, periodical overloads application have a detrimental effect on the fatigue crack initiation strength for fully reversed load ratio (R σ = — 1), while they have no influence under pulsating loading (R σ = 0). A finite element analysis shows that in the fully reversed tension (R σ = — 1), the stabilized cyclic behaviour at the notch root is an elastic-plastic shakedown while elastic shakedown is obtained under pulsated regime (R σ = 0), so that we can consider that the local cyclic behaviour has an influence on the overload effect. However, the overload application does not imply a remarkable modification of the stress and strain field under the subsequent constant amplitude loading and can not explain such a fatigue strength decrease in fully reversed tension.
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Article dans une revue avec comité de lectureBIDOUARD, Hadrien; PALIN-LUC, Thierry; KAUFMANN, Heinz; DUMAS, Christian; EL DSOKI, Chalid; KAUFMANN, Heinz; SONSINO, Cetin Morris; SAINTIER, Nicolas (2009)Fatigue tests were performed on ferritic bainitic steel notched specimens (Kt = 2.5) under load controlled constant amplitude loading. These tests show that under constant amplitude tension compression loading, periodical ...
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Article dans une revue avec comité de lecturePALIN-LUC, Thierry; EL DSOKI, Chalid; BIDOUARD, Hadrien; KAUFMANN, Heinz; DUMAS, Christian; VÖLLMECKE, F.J.; SONSINO, Cetin Morris; SAINTIER, Nicolas (Wiley-VCH Verlag, 2011)Load controlled fatigue tests were performed up to 107 cycles on flat notched specimens (Kt =2.5) under constant amplitude and variable amplitude loadings with and without periodical overloads. Two materials are studied: ...
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