Artículos de revistas
Non-linear stability analysis of imperfect thin-walled composite beams
Fecha
2010-03Registro en:
Machado, Sebastián Pablo; Non-linear stability analysis of imperfect thin-walled composite beams; Pergamon-Elsevier Science Ltd; International Journal Of Non-linear Mechanics; 45; 2; 3-2010; 100-110
0020-7462
CONICET Digital
CONICET
Autor
Machado, Sebastián Pablo
Resumen
The static non-linear behavior of thin-walled composite beams is analyzed considering the effect of initial imperfections. A simple approach is used for determining the influence of imperfection on the buckling, prebuckling and postbuckling behavior of thin-walled composite beams. The fundamental and secondary equilibrium paths of perfect and imperfect systems corresponding to a major imperfection are analyzed for the case where the perfect system has a stable symmetric bifurcation point. A geometrically non-linear theory is formulated in the context of large displacements and rotations, through the adoption of a shear deformable displacement field. An initial displacement, either in vertical or horizontal plane, is considered in presence of initial geometric imperfection. Ritz's method is applied in order to discretize the non-linear differential system and the resultant algebraic equations are solved by means of an incremental Newton-Rapshon method. The numerical results are presented for a simply supported beam subjected to axial or lateral load. It is shown in the examples that a major imperfection reduces the load-carrying capacity of thin-walled beams. The influence of this effect is analyzed for different fiber orientation angle of a symmetric balanced lamination. In addition, the postbuckling response obtained with the present beam model is compared with the results obtained with a shell finite element model (Abaqus). © 2009 Elsevier Ltd. All rights reserved.