Buckling of composite thin walled beams by refined theory

This work presents the buckling analysis of laminated composite thin walled structures by the 1D finite element based unified higher-order models obtained within the framework of the Carrera Unified Formulation (CUF). In the present study, the refined beam theories are obtained on the basis of Taylor-type expansions. The finite element analysis has been chosen to easily handle arbitrary geometries as well as boundary conditions. Buckling behavior of laminated composite beam and flat panels are analyzed to illustrate the efficacy of the present formulation and various types of buckling modes are observed depending on the geometrical and material parameters. It is observed that the lower order models are unable to deal with torsion.

► Buckling of generalized beams using 1D Unified formulation is carried out.
► Good comparison with available results is observed.
► Torsional modes are not depicted using the classical and lower order models.
► Flexural torsional modes are depicted for beams with expansion order N = 2.
► For flat panels, these modes are depicted using N = 6.