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- W1793499535 abstract "CenaeroRue de Freres Wright, 29,`B6041 Gosselies, Belgiumfrederic.lani@cenaero.beKey Words: Stress intensity factors, FEM, XFEM, Turbine Rear Fan.ABSTRACTThis contribution presents the results of a comparative study of two methods for the computation ofstress intensity factors (SIFs) in a state-of-the-art industrial damage tolerant analysis of engine compo-nents.Two methods are investigated:• the first method involves the classical Finite Element Method (FEM). In this approach, a pa-rameterised mesh of the crack is inserted in an un-structured original mesh. The two meshes areintersected and adapted. The parameterised mesh of the crack includes a mesh of the crack planewith triangles and a regular mesh centered on the crack front of which the first layer consists ofquarter-point elements (also called Barsoum elements) and the next layers consist of hexaedra.The method, called FILI (for FIssure LIbre), was developed by Snecma - site de Villaroche [1].It very much relies on the capabilities of the meshing utilities GHS3D and YAMS for the tediousmesh adaptation operations. The FE problem is solved using Samcef (though the method is alsooperational with Abaqus). The SIFs are obtained after computation of the J-integral in domainform, as implemented in Samcef.• the second method involves the eXtended Finite Element Method (XFEM). In this approach, thecrack is handled by way of tangent and normal level sets. The discontinuity of displacement andthe stress singularity are included by way of additional degrees of freedom and dedicated shapefunctions. The unstructured mesh does not need to conform to the crack. Appropriate enrichment,mesh refinement (with the Simmetrix meshing library) and SIF smoothing strategies were imple-mented in order to optimize the quality of the solution. The method was made available to Samcefusing the Substructuring Finite Element Method / eXtended Finite Element Method (S-FE/XFE)[2,3,4]. The XFEM is implemented in the Morfeo software, which uses some of the libraries de-veloped by N. Moes and coworkers at¨ Ecole Centrale de Nantes. The SIFs are obtained using the´interaction integral, a special version of the J-integral in domain form, adapted for handling athermal load." @default.
- W1793499535 created "2016-06-24" @default.
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- W1793499535 date "2008-01-01" @default.
- W1793499535 modified "2023-09-23" @default.
- W1793499535 title "Computation of Stress Intensity Factors for 3D Cracks in a Turbine Rear Fan Blade: Comparison of FEM and XFEM Solutions" @default.
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