Numerical models for nonlinear analysis of elastic shells with eigenmode-affine imperfections

Jinguang Teng, C. Y. Song

Research output: Journal article publicationJournal articleAcademic researchpeer-review

66 Citations (Scopus)

Abstract

Nonlinear finite-element analysis provides a powerful tool for assessing the buckling strength of shells. Since shells are generally sensitive to initial geometric imperfections, a reliable prediction of their buckling strength is possible only if the effect of geometric imperfections is accurately accounted for. A commonly adopted approach is to assume that the imperfection is in the form of the bifurcation buckling mode (eigenmode-affine imperfection) of a suitable magnitude. For shells of revolution under axisymmetric loads, this approach leads to the analysis of a shell with periodically symmetric imperfections. Consequently, sector models spanning over one or half the circumferential wave of the imperfection may be considered adequate. This paper presents a study which shows that a simple nonlinear analysis of the imperfect shell may not deliver the correct buckling load, due to the tendency of the shell to develop mode changes in the deformation process before reaching the limit point. This inadequacy exists not only with short sector models (half-wave or whole-wave models) but also with more complete models (half-structure or whole-structure models) for different reasons. The paper concludes with recommendations on the proper use of the four different kinds of models mentioned above in determining shell buckling strengths.
Original languageEnglish
Pages (from-to)3263-3280
Number of pages18
JournalInternational Journal of Solids and Structures
Volume38
Issue number18
DOIs
Publication statusPublished - 14 Mar 2001

Keywords

  • Bifurcation
  • Buckling
  • Elastic
  • Imperfections
  • Nonlinear analysis
  • Numerical models
  • Post-buckling
  • Shells

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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