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Analytical modelling of the interplay of local and overall buckling in thin walled sandwich struts

This work is an extension of a previous model by Hunt & Wadee (1998) to model and capture buckling mode interaction between overall buckling and local (face plate) buckling in elastic, thin walled sandwich struts with compliant cores. The aforementioned model, based on the potential energy method and large displacement assumptions, was successful in capturing localized interactive buckling in the most compressed face plate, when overall buckling appears first. The revised model allows for local deformations to appear on both face plates as solutions of the governing equations of the system, thus additionally capturing inhomogeneous deformations in the least compressed face plate during interactive buckling, when overall buckling is initially critical. Furthermore this model is able to search and find buckling mode interactions when the local buckling mode is critical, which seem to be more severe as the critical and secondary bifurcations appear to be very close, leading to steep unloading. Results for both cases will be exhibited and will be compared with FE simulations performed in ANSYS. Further work on this model will see the inclusion of geometric and loading imperfections, as well as material property gradations, in order to capture the sensitivity of the interactive phenomena for different cases.

Author(s):

Stylianos Yiatros    
Cyprus University of Technology
Cyprus

Orestes Marangos    
Cyprus University of Technology
Cyprus

Christodoulos Georgiou    
Cyprus University of Technology
Cyprus