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Effects of LCF Loadings on the HCF Life of Notched Specimens in Ferritic-Bainitic Steel

Article dans une revue avec comité de lecture
Author
BIDOUARD, Hadrien
26754 Laboratoire Matériaux Endommagement Fiabilité et Ingénierie des Procédés [LAMEFIP]
ccPALIN-LUC, Thierry
ccSAINTIER, Nicolas
KAUFMANN, Heinz
DUMAS, Christian
EL DSOKI, Chalid
KAUFMANN, Heinz
SONSINO, Cetin Morris

URI
http://hdl.handle.net/10985/10520
DOI
10.3139/120.110069
Date
2009
Journal
Materials Testing

Abstract

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 (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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