A node-based smoothed extended finite element method (NS-XFEM) for fracture analysis

N. Vu-Bac, H. Nguyen-Xuan, L. Chen, S. Bordas, P. Kerfriden, R. N. Simpson, G. R. Liu, T. Rabczuk

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

This paper aims to incorporate the node-based smoothed finite element method (NS-FEM) into the extended finite element method (XFEM) to form a novel numerical method (NS-XFEM) for analyzing fracture problems of 2D elasticity. NS-FEM uses the strain smoothing technique over the smoothing domains associated with nodes to compute the system stiffness matrix, which leads to the line integrations using directly the shape function values along the boundaries of the smoothing domains. As a result, we avoid integration of the stress singularity at the crack tip. It is not necessary to divide elements cut by cracks when we replace interior integration by boundary integration, simplifying integration of the discontinuous approximation. The key advantage of the NS-XFEM is that it provides more accurate solutions compared to the XFEM-T3 element. We will show for two numerical examples that the NS-XFEM significantly improves the results in the energy norm and the stress intensity factors. For the examples studied, we obtain super-convergent results.

Original languageEnglish
Pages (from-to)331-355
Number of pages25
JournalCMES - Computer Modeling in Engineering and Sciences
Volume73
Issue number4
Publication statusPublished - 2011

Keywords

  • Convergence rate
  • Extended finite element method
  • Fracture analysis
  • Node-based smoothed finite element method
  • Numerical method
  • Stress intensity factor (SIF)

ASJC Scopus subject areas

  • Software
  • Modelling and Simulation
  • Computer Science Applications

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  • Cite this

    Vu-Bac, N., Nguyen-Xuan, H., Chen, L., Bordas, S., Kerfriden, P., Simpson, R. N., Liu, G. R., & Rabczuk, T. (2011). A node-based smoothed extended finite element method (NS-XFEM) for fracture analysis. CMES - Computer Modeling in Engineering and Sciences, 73(4), 331-355.