A hybrid finite element-scaled boundary finite element method for crack propagation modelling

E. T. Ooi, Z. J. Yang

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This study develops a novel hybrid method that combines the finite element method (FEM) and the scaled boundary finite element method (SBFEM) for crack propagation modelling in brittle and quasibrittle materials. A very simple yet flexible local remeshing procedure, solely based on the FE mesh, is used to accommodate crack propagation. The crack-tip FE mesh is then replaced by a SBFEM rosette. This enables direct extraction of accurate stress intensity factors (SIFs) from the semi-analytical displacement or stress solutions of the SBFEM, which are then used to evaluate the crack propagation criterion. The fracture process zones are modelled using nonlinear cohesive interface elements that are automatically inserted into the FE mesh as the cracks propagate. Both the FEM's flexibility in remeshing multiple cracks and the SBFEM's high accuracy in calculating SIFs are exploited. The efficiency of the hybrid method in calculating SIFs is first demonstrated in two problems with stationary cracks. Nonlinear cohesive crack propagation in three notched concrete beams is then modelled. The results compare well with experimental and numerical results available in the literature. © 2009 Elsevier B.V.
    Original languageEnglish
    Pages (from-to)1178-1187
    Number of pages9
    JournalComputer Methods in Applied Mechanics and Engineering
    Volume199
    Issue number17-20
    DOIs
    Publication statusPublished - 1 Mar 2010

    Keywords

    • Discrete crack model
    • Finite element method
    • Fracture mechanics
    • Multiple cohesive crack propagation
    • Remeshing
    • Scaled boundary finite element method

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