A two-scale finite element model for the fatigue design of large welded structures
Article dans une revue avec comité de lecture
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 ensure the correct sizing and fatigue design of welded structures. However, weld geometries are often simplified or idealized to limit computational cost. In this work, a numerical two-scale approach is proposed in order to calculate a non-local multiaxial equivalent stress at the weld toe and the weld root from a global finite element shell model. The influence of the parameters of the proposed model on the stiffness behaviour is investigated for three welded structures and for different loading cases. A comparison in terms of stiffness with other models from the literature is also proposed. The results show that the stiffness behaviour is not affected by the parameters of the proposed approach and that it is the most robust model for the different geometries and loading cases studied. The variation in the non-local multiaxial equivalent stress as a function of the parameters of the proposed approach was also studied. The comparison with full solid finite element models makes it possible to define minimum values for the different parameters studied and validates the potential of the proposed approach for the fatigue design of welded structures.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
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 lectureMAREAU, Charles; CUILLERIER, Daniel; MOREL, Franck (Elsevier, 2013)To 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 ...
Simulation of the Kitagawa-Takahashi diagram using a probabilistic approach for cast Al-Si alloys under different multiaxial loads Article dans une revue avec comité de lectureLE, Viet Duc; MOREL, Franck; BELLETT, Daniel; SAINTIER, Nicolas; OSMOND, Pierre (Elsevier, 2016)This article describes a microstructural-based high cycle fatigue strength modelling approach applied to different cast Al-Si alloys used in an automotive context. Thank to different casting processes (gravity die casting ...
Multiaxial high cycle fatigue damage mechanisms associated with the different microstructural heterogeneities of cast aluminium alloys Article dans une revue avec comité de lectureLE, Viet Duc; MOREL, Franck; SAINTIER, Nicolas; BELLETT, Daniel; OSMOND, Pierre (Elsevier, 2016)This article is dedicated to the high cycle fatigue (HCF) behaviour of cast Al-Si alloys. In particular, three similar alloys with different microstructural characteristics are investigated. The result of an experimental ...
Investigation of the effect of porosity on the high cycle fatigue behaviour of cast Al-Si alloy by X-ray micro-tomography Article dans une revue avec comité de lectureLE, Viet Duc; SAINTIER, Nicolas; MOREL, Franck; BELLETT, Daniel; OSMOND, Pierre (Elsevier, 2018)Porosity generated by the casting process has a detrimental effect on the high cycle fatigue strength of cast aluminium alloys. The current study presents an investigation using the non-destructive X-ray micro-tomography ...
A flexible modelling framework leading to a pobabilistic multiaxial Kitagawa-Takahashi diagram : applied to cast Al-Si alloys Communication avec acteLE, Viet Duc; BELLETT, Daniel; MOREL, Franck; SAINTIER, Nicolas; PALIN-LUC, Thierry; PESSARD, Etienne; OSMOND, Pierre (MATEC Web of Conferences, 2014)The aim of this work is to propose simple analytical tools to predict the fatigue strength of cast aluminium components as a function of the casting process and post-cast treatment. The proposed methodology is based on the ...