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Experimental characterization and numerical modeling of the influence of a proof load on the fatigue resistance of welded structures

Article dans une revue avec comité de lecture
Author
HEYRAUD, Hugo
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
ccMAREAU, Charles
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
ccLEFEBVRE, Fabien
AMUZUGA, Philippe
HAUTEVILLE, Robin
ccMOREL, Franck
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
ccJUBIN, Laurent
ccBELLETT, Daniel
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
LEBLANC, Théo

URI
http://hdl.handle.net/10985/24384
DOI
10.1016/j.ijfatigue.2023.107604
Date
2023-03-11
Journal
International Journal of Fatigue

Abstract

The influence of a proof load, or an initial overload, on the fatigue resistance of welded structures is investigated in this study. Arc welded stiffeners made of S355 steel are considered and fatigue-tested in as-welded and proof-loaded conditions. X-ray diffraction analyses are carried out to evaluate the influence of a proof load on the residual stress field. To better understand the role of a proof load on the mechanical fields in the stress concentration zones, a numerical approach based on elasto-plastic finite element analyses is proposed. The methodology includes a non-local multiaxial fatigue criterion, which integrates a strain hardening contribution, that makes it possible to estimate the number of cycles to failure. The comparison between experimental and numerical results indicates that the beneficial effect of a proof load on the fatigue resistance can be mainly attributed to residual stress and strain hardening effects. The final result is a master SN curve adapted to the fatigue design of stiffener structures, tested under different loading conditions.

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