ABSTRACT
In this paper, new methods of stabilizing techniques used for panels, webs and ribs of the composite structures are studied. The effects of important design considerations parameters such as, beads radius, beads depth and beads spacing on the initial buckling load of the panels are studied. The results show that, there is an optimum beads spacing for each panel containing more than one bead which can be estimated using a simple equation. There are not significant changes on the buckling loads of the beaded panels with beads depth of bigger than 0.6 times of the beads radius. Instability of wing nose and main ribs made of woven E-glass material stiffened by P.V.C foam core and vertical male beads are also studied using both experimental and finite elements methods. The experimental results show that we can easily improve panels and webs instability using vertical male beads instead of sandwiched webs. It may cause weight reduction of about 50% and manufacturing time reduction of about 50%.
