Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux

Type de document

COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)

Langue

anglais

Auteur

BERNOALA ; DIENG ; CHATAIGNER ; FALAISE

Résumé / Abstract

Steel structures are mainly prone to two types of degradation: corrosion and fatigue particularly in the case of welded structures. In the second case, several methods have been implemented in the last decades to improve the capacities such as shot peening or grinding for instance. Actually, welding processes induce the creation of residual stresses within the realized assembly that decrease the fatigue capacities. In order to be able to assess the possible improvement, it is therefore momentous to settle a method to determine these residual stresses. The presented work aims at studying these residual stresses using both experimental investigations and numerical work. The first part will introduce the experimental work conducted on welded T-joints. The investigations allowed to measure the created residual stresses close to the weld toe and to determine the possible improvement in fatigue of shot peened or grinded welded joints in regard with untreated assemblies. The second part will be dedicated to the description of a finite element model used for the welding process. The advantages and the drawbacks of the method will be presented and the obtained numerical results will be compared with the experimental ones. Finally, the last part will be focused on the analysis of the influence of different welding parameters on the created residual stresses. Following this study, numerical development currently under progress will allow to model shot peening operations in order to be able to study the way they affect residual stresses.