Abstract
An economic finite element strategy is developed for the estimation of Stress Intensity Factors (SIF) in Linear Elastic Fracture Mechanics (LEFM) problems involving cracks in structural components. Considering two-dimensional problems, the finite element model consists of 5- noded triangular isoparametric regular/singular elements located at the crack tip and 4-noded quadrilateral elements in the remaining part of the structure. The square root singularity is achieved in the 5-noded elements by moving the mid-side nodes to the quarter point position (as in the case of 8-noded quadrilateral/6-noded triangular elements). Modified Crack Closure Integral (MCCI) method is adopted which generates accurate results for a relatively coarse mesh. The relevant equations for strain-energy-release rates (G) are derived for 5-noded triangular element and the SIF are computed. The model is demonstrated by numerical studies for a centre crack in finite plate under uniaxial tension.
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