Análise comparativa do comportamento estrutural de uma viga Engastada-Livre de Seção-Caixão com paredes finas constituídas por material compósito e convencional

Abstract

The present work presents several analyzes of the structural behavior of a beam constituted by thin walls, with cross section of the coffin type, with respect to the normal and shear stresses. It was considered a beam with set-free end conditions, simulating an aircraft wing, requested by concentrated and eccentric loads acting perpendicular to its axis, providing combined bending, torsion and shear forces. Analytical developments of thin - walled beams were compiled through analytical methods, considering Booms' structural idealization and also with cross section with walls devoid of stiffeners, using isotropic and composite structural materials. Normal and critical shear stresses were obtained for six different models of combination of structural materials and structural idealization, and compared with those acquired with finite element numerical modeling, carried out with the aid of the NASTRAN® computer program. The deviations obtained with the comparisons of the obtained results were satisfactory. It is important to note the impact of the elastic modulus of composite materials on both the structural behavior of stiffeners requested by normal stresses and of the panels under the effect of intervening shear flows