Estabilidade de colunas laminadas de material compósito com seção C

Abstract

The increasing use of composite materials encourages the manufacture of thin-walled elements, due to cost and efficiency. However, these structures are highly slender and susceptible to stability failures when subjected to compressive stresses. Channel profiles have wide applicability as columns and are subject to local and global buckling modes, which makes the structural behavior of these profiles of interest for study. Considering these aspects, this work studies the stability of laminated columns of fiber-reinforced composite material with channel sections subjected to compression. Initially, the Rayleigh-Ritz Method, with one and two degrees of freedom, is used to determine the local buckling load, with these values being compared with results obtained using the Finite Element Method (FEM), in addition to numerical and experimental results available in the literature. Then, the Rayleigh-Ritz Method is also applied to determine the global buckling load, considering the bending-torsion and bending modes around the axis of least inertia. The calculation of cross-sectional equivalent properties of laminated columns is carried out using the theories of Cardoso (1999), Massa and Barbeiro (1998), and Kollar and Pluzsik (2002). The results are compared with those obtained using the Finite Element Method. The proposed approach allows the simple and efficient determination of the signature curve of laminated columns with channel sections subjected to pure compression. This approach is applied to columns with different layups and cross-sectional dimensions, including a parametric study to evaluate the effect of adding layers, consequently increasing the laminate thickness, in addition to different geometric configurations considering the same material consumption.