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Article
A large deformation, rotation-free, isogeometric shell
Computer Methods in Applied Mechanics and Engineering (2011)
  • D. J. Benson, University of California, San Diego
  • Y. Bazilevs, University of California, San Diego
  • Ming-Chen Hsu, University of California, San Diego
  • T. J. R. Hughes, University of Texas at Austin
Abstract

Conventional finite shell element formulations use rotational degrees of freedom to describe the motion of the fiber in the Reissner–Mindlin shear deformable shell theory, resulting in an element with five or six degrees of freedom per node. These additional degrees of freedom are frequently the source of convergence difficulties in implicit structural analyses, and, unless the rotational inertias are scaled, control the time step size in explicit analyses. Structural formulations that are based on only the translational degrees of freedom are therefore attractive. Although rotation-free formulations using C0 basis functions are possible, they are complicated in comparison to their C1 counterparts. A Ck-continuous, k ⩾ 1, NURBS-based isogeometric shell for large deformations formulated without rotational degrees of freedom is presented here. The effect of different choices for defining the shell normal vector is demonstrated using a simple eigenvalue problem, and a simple lifting operator is shown to provide the most accurate solution. Higher order elements are commonly regarded as inefficient for large deformation analyses, but a traditional shell benchmark problem demonstrates the contrary for isogeometric analysis. The rapid convergence of the quadratic element is demonstrated for the NUMISHEET S-rail benchmark metal stamping problem.

Keywords
  • Isogeometirc analysis,
  • NURBS,
  • SHells,
  • Rotation-free,
  • Metal stamping
Publication Date
March 1, 2011
Publisher Statement
NOTICE: this is the author’s version of a work that was accepted for publication in Computer Methods in Applied Mechanics and Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published inComputer Methods in Applied Mechanics and Engineering, 200, 13-16, (2011) DOI: 10.1016/j.cma.2010.12.003.
Citation Information
D. J. Benson, Y. Bazilevs, Ming-Chen Hsu and T. J. R. Hughes. "A large deformation, rotation-free, isogeometric shell" Computer Methods in Applied Mechanics and Engineering Vol. 200 Iss. 13-16 (2011)
Available at: http://works.bepress.com/ming-chen_hsu/12/