Strain smoothing in FEM and XFEM

Stéphane P A Bordas, Timon Rabczuk, Nguyen Xuan Hung, Vinh Phu Nguyen, Sundararajan Natarajan, Tino Bog, Do Minh Quan, Nguyen Vinh Hiep

Research output: Contribution to journalArticle

217 Citations (Scopus)

Abstract

We present in this paper recent achievements realised on the application of strain smoothing in finite elements and propose suitable extensions to problems with discontinuities and singularities. The numerical results indicate that for 2D and 3D continuum, locking can be avoided. New plate and shell formulations that avoid both shear and membrane locking are also briefly reviewed. The principle is then extended to partition of unity enrichment to simplify numerical integration of discontinuous approximations in the extended finite element method. Examples are presented to test the new elements for problems involving cracks in linear elastic continua and cracked plates. In the latter case, the proposed formulation suppresses locking and yields elements which behave very well, even in the thin plate limit. Two important features of the set of elements presented are their insensitivity to mesh distortion and a lower computational cost than standard finite elements for the same accuracy. These elements are easily implemented in existing codes since they only require the modification of the discretized gradient operator, B.

Original languageEnglish
Pages (from-to)1419-1443
Number of pages25
JournalComputers and Structures
Volume88
Issue number23-24
DOIs
Publication statusPublished - 2010 Dec 1
Externally publishedYes

    Fingerprint

Keywords

  • Accuracy
  • Convergence
  • Extended finite element method
  • SFEM
  • Smoothed finite element
  • XFEM

ASJC Scopus subject areas

  • Computer Science Applications
  • Civil and Structural Engineering
  • Mechanical Engineering
  • Modelling and Simulation
  • Materials Science(all)

Cite this

Bordas, S. P. A., Rabczuk, T., Hung, N. X., Nguyen, V. P., Natarajan, S., Bog, T., Quan, D. M., & Hiep, N. V. (2010). Strain smoothing in FEM and XFEM. Computers and Structures, 88(23-24), 1419-1443. https://doi.org/10.1016/j.compstruc.2008.07.006