Observations on fatigue crack paths in the corners of cold-formed high-strength steel tubes

S. Heinilä, G. Marquis, T. Björk

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    Abstrakti

    Fatigue crack propagation in cold-formed corners of high-strength structural steel plate-type structures has been investigated. Large- and small-scale test specimens having complex residual stress states and subject to multi-axial cyclic local stresses have been investigated using both laboratory tests and numerical simulations. The combinations of alternating bending stress, alternating shear stress and static mean stress producing complex multi-axial stress states have been found to influence the fatigue crack path behaviour. Straight, zig-zag and "S" shaped cracks were observed depending on the material strength, range of cyclic loading, residual stress field and multi-axiality of the local stresses. Numerical simulations of residual stresses and linear elastic fracture mechanics were used to help understand the alternate crack paths. Mode I cracks propagating into a static compressive stress field did not arrest, but, due to the multi-axial stresses, combinations of mixed mode I, II and III crack growth with distinct paths were observed. The crack paths depend on the type and range of cyclic loading, material properties and residual stress conditions of the specimens. (C) 2007 Elsevier Ltd. All rights reserved.

    AlkuperäiskieliEnglanti
    Sivut833-844
    Sivumäärä12
    JulkaisuEngineering Fracture Mechanics
    Vuosikerta75
    Numero3-4
    DOI - pysyväislinkit
    TilaJulkaistu - 2008
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu
    TapahtumaInternational Conference on Crack Paths - Parma, Italia
    Kesto: 1 syyskuuta 20064 syyskuuta 2006
    Konferenssinumero: 6

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