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Ji, Wooseok
Composite Materials and Structures Lab
Research Interests
  • Mechanics of composites
  • In situ experiments
  • Fracture mechanics
  • Computational solid mechanics
  • Advanced finite element methods
  • Static and dynamic stability of structures

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Accurate buckling load calculations of a thick orthotropic sandwich panel

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Title
Accurate buckling load calculations of a thick orthotropic sandwich panel
Author
Ji, WooseokWaas, Anthony M.
Keywords
Sandwich; Mechanical properties; Computational mechanics; Anisotropy; Sandwich structures
Issue Date
2012-06
Publisher
ELSEVIER SCI LTD
Citation
COMPOSITES SCIENCE AND TECHNOLOGY, v.72, no.10, pp.1134 - 1139
Abstract
This paper is concerned with the buckling of thick sandwich panels with orthotropic elastic face sheets bonded to a linear elastic orthotropic core. When such panels are analyzed for axial load carrying capacity, it is now commonplace to adopt the finite element method to carry out computations. The accuracy of the numerical results will depend not only on roundoff and algorithmic errors, but additionally on the approximations made in computing the incremental (second order) work associated in computing the change of configuration from the unbuckled to the buckled state. Here we show that, particularly for orthotropic thick sandwich structures, large errors can be incurred in computing buckling loads with available commercial software, unless the proper work conjugate measures of stress and strain with their stress-dependent tangential moduli are used in the buckling formulation. (C) 2012 Elsevier Ltd. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/9568
DOI
10.1016/j.compscitech.2012.02.020
ISSN
0266-3538
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