Modelling of the stiffness evolution of truss core structures damaged by plastic buckling

Siska, Filip, Stratil, Ludek, Dlouhy, Ivo and Barnett, Matthew Robert 2015, Modelling of the stiffness evolution of truss core structures damaged by plastic buckling, Finite elements in analysis and design, vol. 100, pp. 1-11, doi: 10.1016/j.finel.2015.02.006.

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Title Modelling of the stiffness evolution of truss core structures damaged by plastic buckling
Author(s) Siska, Filip
Stratil, Ludek
Dlouhy, Ivo
Barnett, Matthew RobertORCID iD for Barnett, Matthew Robert
Journal name Finite elements in analysis and design
Volume number 100
Start page 1
End page 11
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-08
ISSN 0168-874X
Keyword(s) Beam theory
Finite element
Plastic buckling
Truss-cored laminates
Science & Technology
Physical Sciences
Mathematics, Applied
Summary A finite element study based on 1D beam element model is performed in order to investigate the mechanical behavior of an elasto-plastic beam loaded in axial compression over its buckling limit. The mode of loading is related to the damage of truss-cored beams in truss-cored laminates. The analysis takes into account the effects of geometry and material properties. The results of the FEM analysis are used for developing a simple mechanical model based on the basic Euler-Bernoulli beam theory and accounts for the beam compressibility. The model uses phenomenological functions containing parameters related to the basic material and geometrical properties. The presented model is developed in the form of closed solution which does not require complex numerical methods or extensive parametric studies. Predictions of the compressive stiffness degradation of truss-cored composites are made with the proposed model and compared with the results of FEM simulations. The error of the stiffness prediction with respect to the FEM results is within 10% over a 5 fold range of stiffness.
Language eng
DOI 10.1016/j.finel.2015.02.006
Field of Research 091207 Metals and Alloy Materials
091307 Numerical Modelling and Mechanical Characterisation
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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