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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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Wrinkling and edge buckling in orthotropic sandwich beams

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Title
Wrinkling and edge buckling in orthotropic sandwich beams
Author
Ji, WooseokWaas, Anthony M.
Keywords
sandwich structures; axial compression; elastic analysis; edge effects; finite element method; buckling; beams; orthotropism
Issue Date
2008-06
Publisher
ASCE-AMER SOC CIVIL ENGINEERS
Citation
JOURNAL OF ENGINEERING MECHANICS-ASCE, v.134, no.6, pp.455 - 461
Abstract
A sandwich beam buckling problem is studied here using two-dimensional elasticity to model the beam constituents. The global and local instability of such a beam with orthotropic constituents under various boundary conditions are investigated. The face sheet and the core are assumed to be linear elastic orthotropic continua. General buckling deformation modes of the sandwich beam subjected to uniaxial compressive loading are considered. The appropriate incremental stress and conjugate incremental finite-strain measure for the instability problem of the sandwich beam, and the corresponding constitutive model are addressed. It is shown that a sandwich beam having a core with a negligible stiffness compared to the face sheets is prone to fail by edge buckling. The present analysis is compared with several previous analytical studies and corresponding experimental results. Finite-element analyses are carried out for comparison against the theoretical predictions. The formulation used in the finite-element code is discussed in relation to the formulation adopted in the theoretical derivation.
URI
https://scholarworks.unist.ac.kr/handle/201301/9572
DOI
10.1061/(ASCE)0733-9399(2008)134:6(455)
ISSN
0733-9399
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