Offshore steel platforms are designed to rsist loads elastically, whereas abnormal loads should lead to only local demage. The present investigation has concentrated on the feasibility of employing shell and line spring finite elements in the analysis of the ductile fracture initiation capacity of cracked tubular joints. Ease of analysis without any numerical problems was experienced throughout this work, i.e. the approach is user-friendly. Comparisons with model tests and computer simulations based on alternative methods (solid FE and virtual crack extension) were presented. In all comparisons of global load versus displacement behaviour, the agreement was good, with reasonable prediction of behaviour up to estimated crack initiation levels. The estimated critical values of J for the model tests compared reasonably well with the load-displacement behaviour in the tests. The comparison between J values computed from line springs and the virtual crack extension technique did not reveal any major differences, except the lack of variation of J along the crack front for the line spring based approach. Some characteristics of tubular joint behaviour and their implications on J integral computations were adressed. In ultimate load analyses of tubular joints, hot spots often are subjected to finite rotations. This will affect both the accuracy of the element formulation, and J integral calculations. The detrimental effect of mixed-mode loading on ductile crack growth initiation was discussed, as tubular joints invariably will exhibit some mode II and mode III in addition to mode I. The issue of ductile tearing should also be resolved if the full load-displacement is to be predicted realistically.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Inelastic line springs in non-linear analysis of cracked tubular joints


    Weitere Titelangaben:

    Inelastische Federelemente in der nichtlinearen Analyse rißbehafteter Rohrverbindungen


    Beteiligte:
    Skallerud, B. (Autor:in)


    Erscheinungsdatum :

    1995


    Format / Umfang :

    13 Seiten, 10 Bilder, 29 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Residual static strength of high strength steel cracked tubular joints

    Talei-Faz, B. / Brennan, F. P. / Dover, W. D. | British Library Online Contents | 2004


    Strength Reduction Factors for Cracked Multi-planar Tubular DT-joints

    Li, Tao / Lie, Sengtjhen | Online Contents | 2019


    Strength Reduction Factors for Cracked Multi-planar Tubular DT-joints

    Li, Tao / Lie, Sengtjhen | Springer Verlag | 2018


    Segmented Tubular Seat Springs

    Haslim, L. A. | NTRS | 1984


    Review of empirical and semi-empirical Y factor solutions for cracked welded tubular joints

    Etube, L. S. / Brennan, F. P. / Dover, W. D. | British Library Online Contents | 1999