Surface versus internal fatigue crack initiation in steel : Influence of mean stress
dc.contributor.author
hal.structure.identifier | GAUR, Vidit
|
dc.contributor.author
hal.structure.identifier | DOQUET, Véronique
|
dc.contributor.author | PERSENT, Emmanuel |
dc.contributor.author
hal.structure.identifier | MAREAU, Charles
|
dc.contributor.author | ROGUET, Eléonore |
dc.contributor.author | KITTEL, Jean |
dc.date.accessioned | 2016 |
dc.date.available | 2017 |
dc.date.issued | 2016 |
dc.date.submitted | 2016 |
dc.identifier.issn | 0142-1123 |
dc.identifier.uri | http://hdl.handle.net/10985/10759 |
dc.description.abstract | Stress-controlled fatigue tests were run at different R ratios (= sigma min / sigma max) up to at most 3 million cycles on a 2.5%Cr–1%Mo steel (ASTM A182 F22) used in riser tubes connectors for offshore oil drilling. The fatigue lives, as well as the slope of the S – N curves were found to decrease with increasing R and the endurance limit to follow Gerber’s parabola. Surface crack initiation without any defect involved, was most often observed for R=-1, 0.5 and 0, while an R ratio of 0.25 triggered crack initiation from either surface or internal pores or chemically inhomogeneous areas, leading, in the latter case, to fish-eye patterns for relatively low numbers of cycles. A further increase in R ratio to 0.5 promoted only defect-initiated surface cracks, while no fatigue fracture was observed within 10 million cycles above R=0.6. These transitions in crack initiation mode are discussed based on X-ray diffraction analyses of residual stresses, elastic–plastic F.E. computations on a unit cell model containing a pore and some fracture mechanics analyses, with a particular attention to environmental effects. |
dc.description.sponsorship | The authors acknowledge the assistance of Dr. E. Heripre for FIB sectioning and observations with a dual beam microscope bought within the Equipex Matmeca funding program. |
dc.language.iso | en |
dc.publisher | Elsevier |
dc.rights | Post-print |
dc.subject | Mean stress |
dc.subject | Internal crack |
dc.subject | Steel |
dc.subject | Defects |
dc.subject | Fish-eye |
dc.title | Surface versus internal fatigue crack initiation in steel : Influence of mean stress |
ensam.embargo.terms | 2018-02-01 |
dc.identifier.doi | 10.1016/j.ijfatigue.2015.08.028 |
dc.typdoc | Article dans une revue avec comité de lecture |
dc.localisation | Centre de Angers |
dc.subject.hal | Sciences de l'ingénieur: Mécanique |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Mécanique des matériaux |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Mécanique des solides |
ensam.audience | Internationale |
ensam.page | 437-448 |
ensam.journal | International Journal of Fatigue |
ensam.volume | 82 |
ensam.peerReviewing | Oui |
hal.status | unsent |