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Publisher DOI: 10.1177/0954406215571462
Title: Experimental and numerical analysis of fillet-welded joints under low-cycle fatigue loading by means of full-field techniques
Language: English
Authors: Corigliano, Pasqualino 
Crupi, Vincenzo 
Fricke, Wolfgang 
Friedrich, Nils 
Guglielmino, Eugenio 
Keywords: low-cycle fatigue test;welded ship structure;digital image correlation;thermographic analysis;finite element analysis
Issue Date: 5-Feb-2015
Publisher: Sage Publications
Source: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 7 (229): 1327-1338 (2015)
Journal or Series Name: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 
Abstract (english): The welded structures used in the naval field are generally subjected to fluctuating stress over time. In some structural welded details, due to changing loading conditions, significant elastic-plastic deformation can arise, which may lead to the failure of the structure after a relatively low number of cycles. The aim of this scientific work was to investigate the behavior of welded T-joints under low-cycle fatigue using full-field techniques: digital image correlation and infrared thermography. Low-cycle fatigue tests were carried out on welded “small-scale” specimens with the aim of obtaining loading and boundary conditions similar to those that occur in “large-scale” components in their real operating conditions. A nonlinear finite element analysis was also performed. The material curves, relative to different zones (base material, heat-affected zone, weld), were obtained by hardness measurements, which were done by means of a fully automated hardness scanner with high resolution. This innovative technique, based on the ultrasonic contact impedance method, allowed to identify the different zones (base material, heat-affected zone, weld metal) and to assess their cyclic curves, which were considered in the finite element model. Finally, the finite element model was validated experimentally comparing the results with the measurements obtained using the digital image correlation technique. The applied procedure allows providing useful information to the development of models for the prediction of fracture and fatigue behavior of the welded joints under the low-cycle fatigue loading.
DOI: 10.15480/882.1584
ISSN: 2041-2983
Institute: Konstruktion und Festigkeit von Schiffen M-10 
Type: (wissenschaftlicher) Artikel
Permission Note: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich. This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
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