Title of article :
Three-dimensional mixed-mode stress intensity factors for cracks in functionally graded materials using enriched finite elements
Author/Authors :
Ayhan، نويسنده , , Ali O.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
15
From page :
796
To page :
810
Abstract :
Three-dimensional enriched finite elements are used to compute mixed-mode stress intensity factors (SIFs) for three-dimensional cracks in elastic functionally graded materials (FGMs) that are subject to general mixed-mode loading and constraint conditions. The method, which advantageously does not require special mesh configuration/modifications and post-processing of finite element results, is an enhancement of previous developments applied so far on isotropic homogeneous and isotropic interface cracks. The spatial variation of FGM material properties is taken into account at the level of element integration points. To validate the developed method, two- and three-dimensional mixed-mode fracture problems are selected from the literature for comparison. Two-dimensional cases include: inclined central crack in a large FGM medium under uniform tensile strain and stress loadings, a slanted crack in a finite-size FGM plate under exponentially varying tensile stress loading and an edge crack in a finite-size plate under shear traction load. The three-dimensional example models a deflected surface crack in a finite-size FGM plate under uniform tensile stress loading. Comparisons between current results and those from analytical and other numerical methods yield good agreement. Thus, it is concluded that the developed three-dimensional enriched finite elements are capable of accurately computing mixed-mode fracture parameters for cracks in FGMs.
Keywords :
enriched finite elements , Three-dimensional fracture , Mixed-Mode , Stress intensity factor , Edge crack , Inclined crack , Deflected crack , Surface crack , Functionally graded materials
Journal title :
International Journal of Solids and Structures
Serial Year :
2009
Journal title :
International Journal of Solids and Structures
Record number :
1387229
Link To Document :
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