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Title: Localized buckling in sandwich struts with inhomogeneous deformations in both face plates
Authors: Yiatros, Stylianos 
Marangos, Orestes 
Wadee, M. Ahmer 
Georgiou, Christodoulos 
Keywords: Mode interaction;Sandwich struts;Variational formulation;Interactive buckling;Post-buckling
Category: Civil Engineering
Field: Engineering and Technology
Issue Date: Dec-2015
Publisher: Elsevier Science Limited
Source: Composite Structures, 2015, Volume 133, Issue 1, pages 630–641
Journal: Composite Structures 
Abstract: A nonlinear analytical model for investigating localized interactive buckling in simply supported thin-face plate sandwich struts with weak cores is extended to account for local deformations in both face plates, which have been observed in experiments and finite element simulations. The original model is based on potential energy principles with large displacement assumptions. It assumes Timoshenko shear deformable theory for the core and approximates the overall mode as a half-sine wave along the length of the strut while the local face plate displacements are initially unknown and are found as solutions of the governing equations. The extended model is able to capture measurable local face plate displacements in the less compressed face plate, beyond the secondary bifurcation which leads to localized interactive buckling, for the case where overall buckling is critical. Moreover, the allowance of local displacements in both face plates allows the extended model to predict the post-buckling behavior better in cases where local buckling is critical. The results from this model compare very well with nonlinear finite element simulations with respect to both the equilibrium paths and panel deformations.
ISSN: 0263-8223
1879-1085 (Online)
Rights: Copyright © Elsevier B.V.
Type: Article
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