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Meccanica

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Extended virtual element method for the torsion problem of cracked prismatic beams

  • Andrea Chiozzi
  • Elena BenvenutiEmail author
Computational Models for ‘Complex’ Materials and Structures, beyond the Finite Elements
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Abstract

In this paper, we investigate the capability of the recently proposed extended virtual element method (X-VEM) to efficiently and accurately solve the problem of a cracked prismatic beam under pure torsion, mathematically described by the Poisson equation in terms of a scalar stress function. This problem is representative of a wide class of elliptic problems for which classic finite element approximations tend to converge poorly, due to the presence of singularities. The X-VEM is a stabilized Galerkin formulation on arbitrary polygonal meshes derived from the virtual element method (VEM) by augmenting the standard virtual element space with an additional contribution that consists of the product of virtual nodal basis functions with a suitable enrichment function. In addition, an extended projector that maps functions lying in the extended virtual element space onto linear polynomials and the enrichment function is employed. Convergence of the method on both quadrilateral and polygonal meshes for the cracked beam torsion problem is studied by means of numerical experiments. The computed results affirm the sound accuracy of the method and demonstrate a significantly improved convergence rate, both in terms of energy and stress intensity factor, when compared to standard finite element method and VEM.

Keywords

Virtual element method Extended virtual element method Partition of unity method Cracked beam torsion problem Singularities Polygonal meshes 
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Notes

Acknowledgements

The Authors are grateful to Prof. N. Sukumar and Dr. G. Manzini for their valuable contributions to the developments contained in this paper.

Funding

This study was funded by Ministero dell’Istruzione, dell’ Università e della Ricerca, PRIN: Progetti di Ricerca di Rilevante Interesse Nazionale (Grant No. 2015LYYXA8).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of EngineeringUniversity of FerraraFerraraItaly

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