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• W3162022044 abstract "Purpose It has been usual to prefer an enrichment pattern independent of the mesh when applying singular functions in the Generalized/eXtended finite element method (G/XFEM). This choice, when modeling crack tip singularities through extrinsic enrichment, has been understood as the only way to surpass the typical poor convergence rate obtained with the finite element method (FEM), on uniform or quasi-uniform meshes conforming to the crack. Then, the purpose of this study is to revisit the topological enrichment strategy in the light of a higher-order continuity obtained with a smooth partition of unity (PoU). Aiming to verify the smoothness' impacts on the blending phenomenon, a series of numerical experiments is conceived to compare the two GFEM versions: the conventional one, based on piecewise continuous PoU's, and another which considers PoU's with high-regularity. Design/methodology/approach The stress approximations right at the crack tip vicinity are qualified by focusing on crack severity parameters. For this purpose, the material forces method originated from the configurational mechanics is employed. Some attempts to improve solution using different polynomial enrichment schemes, besides the singular one, are discussed aiming to verify the transition/blending effects. A classical two-dimensional problem of the linear elastic fracture mechanics (LEFM) is solved, considering the pure mode I and the mixed-mode loadings. Findings The results reveal that, in the presence of smooth PoU's, the topological enrichment can still be considered as a suitable strategy for extrinsic enrichment. First, because such an enrichment pattern still can treat the crack independently of the mesh and deliver some advantage in terms of convergence rates, under certain conditions, when compared to the conventional FEM. Second, because the topological pattern demands fewer degrees of freedom and impacts conditioning less than the geometrical strategy. Originality/value Several outputs are presented, considering estimations for the <m:math xmlns:m=http://www.w3.org/1998/Math/MathML display=inline><m:mrow><m:mi mathvariant=script>J</m:mi></m:mrow></m:math> –integral and the angle of probable crack advance, this last computed from two different strategies to monitoring blending/transition effects, besides some comments about conditioning. Both h - and p -behaviors are displayed to allow a discussion from different points of view concerning the topological enrichment in smooth GFEM." @default.
• W3162022044 created "2021-05-24" @default.
• W3162022044 creator A5001272225 @default.
• W3162022044 date "2021-09-02" @default.
• W3162022044 modified "2023-09-27" @default.
• W3162022044 title "On the topological enrichment for crack modeling via the generalized/extended FEM: a novel discussion considering smooth partitions of unity" @default.
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• W3162022044 doi "https://doi.org/10.1108/ec-07-2020-0360" @default.
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