Abstract
In this paper, the indirect boundary element method, coupled with the weight function concept, is developed for the analysis of three-dimensional elastostatic fracture mechanics mixed-mode problems. A set of boundary integral equations for the fictitious loads and the displacement discontinuities are derived. The weight functions used to calculate the stress intensity factors are determined by incrementing the crack front over a small region. The stress intensity factors were also evaluated by the equivalent stress method to compare with those obtained from the weight functions. Results of mixed-mode stress intensity factors are presented for a square bar, with either a rectangular or a circular crack, under static load.
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