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    Item type:Publication, Access status: without files ,
    Local strain approaches for LCF life prediction of ship welded joints
    (2018)
    Corigliano, Pasqualino
    ;
    Crupi, Vincenzo
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    Dong, Pingsha
    ;
    Fricke, Wolfgang 
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    Guglielmino, Eugenio
    The aim of this research activity is to predict the low-cycle fatigue life of welded joints used for ship structures, applying two methods: the effective notch strain approach and the structural strain approach. The first method was applied performing elastic-plastic finite element analyses (FEA), using different cyclic stress-strain curves for base material, heat affected zone and weld metal, while the second method is mesh insensitive for applications in high cycle fatigue regime and has recently been adapted for applications in low cycle fatigue regime. The geometry used for the first method was acquired by means of a 3D scanner. Effective notch strain results and structural strain results were used to predict the low cycle fatigue life.
    Publicationtype: Conference Paper
      99
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    Item type:Publication, Access status: without files ,
    Low-cycle fatigue life prediction of fillet-welded joints in ship details
    (2015-06)
    Corigliano, Pasqualino
    ;
    Crupi, Vincenzo
    ;
    Fricke, Wolfgang 
    ;
    Guglielmino, Eugenio
    Welded joints in ship structures are subject to several variable loadings which may lead to fracture after a relatively low number of cycles. This behaviour is not always fully described by high-cycle fatigue predictions, so low-cycle fatigue has also to be assessed, considering plastic deformation. Local approaches are applied in these cases and are mainly based on local displacement and strain measurements by strain gauges. These approaches have physical limitations when high stress concentrations regions have to be analyzed. The aim of the present research activity is to predict the low-cycle fatigue life of fillet welded joints using the notch strain approach. Elastic-plastic finite element analysis (FEA) was performed, using different cyclic stress-strain curves for base material, heat affected zone and weld metal. Three models of the welded specimen were considered in the FEA: the first model refers to nominal dimension, the second one to the measured thicknesses of the plates and the third model to the geometry acquired by means of a 3D scanner. The finite element analyses were validated by the experimental data. Effective notch strain values from fro FEA were used to predict fatigue life. The proposed method gave interesting information about fatigue life of fillet welded joints used in ship structures.
    Publicationtype: Conference Paper
      62
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    Item type:Publication, Access status: with files ,
    Experimental and numerical analysis of fillet-welded joints under low-cycle fatigue loading by means of full-field techniques
    (Sage Publications, 2015-02-05)
    Corigliano, Pasqualino
    ;
    Crupi, Vincenzo
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    Fricke, Wolfgang 
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    Friedrich, Nils
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    Guglielmino, Eugenio
    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.
    Publicationtype: Journal Article
    Scopus© Citations 37  303  1321
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    Item type:Publication, Access status: without files ,
    FE analysis of cruciform welded joints considering different mechanical properties for base material : heat affected zone and weld metal
    (Gruppo Italiano Frattura, 2014)
    Corigliano, Pasqualino
    ;
    Crupi, Vincenzo
    ;
    Guglielmino, Eugenio
    ;
    Fricke, Wolfgang 
    The aim of this scientific work was to investigate the behaviour of cruciform welded joints under static loading using a full-field technique: Digital Image Correlation. 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 UCI method, allowed to identify the different zones and to assess their different mechanical properties, 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.
    Publicationtype: Journal Article
      54