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
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.
Showing items related by title, author, creator and subject.
Article dans une revue avec comité de lectureHEYRAUD, Hugo; ROBERT, Camille; MAREAU, Charles; BELLETT, Daniel; MOREL, Franck; BELHOMME, Nicolas; DORE, Olivier (Elsevier BV, 2021-02-14)Weld toes and weld roots of continuously welded structures subjected to cyclic loading are critical zones in terms of the fatigue resistance. The finite element method coupled with a fatigue criterion is commonly used to ...
Experimental and numerical study of the evolution of stored and dissipated energies in a medium carbon steel under cyclic loading Article dans une revue avec comité de lectureTo obtain robust estimations of the fatigue limit from energy-based fatigue criteria, constitutive laws must include a correct description of the energy balance when modeling the cyclic behavior. The present paper aims at ...
Article dans une revue avec comité de lectureThe aim of this paper is to present a novel un-notched fatigue test specimen in which a biaxial stress state is achieved using a uniaxial loading condition. This allows the problem of multi-axial fatigue to be studied using ...
Modelling the role of non metallic inclusions on the anisotropic fatigue behaviour of forged steel Article dans une revue avec comité de lectureForged components are known to show high cyclic and monotonic mechanical properties. This is mainly due to a better compactness and a finer microstructure introduced by the forming process. However, this good mechanical ...
Article dans une revue avec comité de lectureThe objective of this work is to propose an anisotropic fatigue criterion for the sizing of industrial forged components. The results from different experimental campaigns using three different rolled steels are first ...