Peculiarities in the Material Design of Buckling Resistance for Tensioned Laminated Composite Panels with Elliptical Cut-Outs

Abstract

The results of analytical and numerical studies of the buckling behavior of laminated multilayered tensioned sheets with circular and elliptical openings are presented. The analysis shows the significant influence of stress concentration effects on buckling modes and loads, particularly taking into consideration variations in the E1/E2 and E1/G12 ratios. The results of finite element (FE) computations prove that the buckling mode cannot be described by a single buckle localized at the apex of the hole. The optimal design of such structures seems to be much more complicated than classical buckling problems of compressed laminated panels without holes. However, the obtained results indicate that the optimal laminate configurations occur at the boundaries of the feasible regions of the introduced design space. Both continuous and discrete fibre orientations are considered. For continuous fibre orientations, the optimal stacking sequence corresponds to angle-ply symmetric laminates.

Natural Frequencies of Rectangular Laminated Plates—Introduction to Optimal Design in Aeroelastic Problems

“…For composite laminated 2D structures the variety of problems connected with the definitions of appropriate design variables, objectives functions and optimization algorithms is discussed in Refs [51][52][53][54][55]. Figure A1.…”

A review of stress concentration studies on fibre composite panels with holes/cutouts

“…aspect ratio and plate area. Muc 90 in a recent study comparing analytical predictions of buckling strength with results of FE simulation for laminated composites with elliptical holes found that buckling resistance and stress concentration were mutually dependent.…”

A Parametric study on the effect of elliptical cutouts for buckling behavior of composite plates under non-uniform edge loads

“…The application of these elliptical cutouts within thin-walled structures for aeronautical applications cannot be avoided, as these cutouts being necessary for the realization of doors and windows or the presence of electrical cables and pipes in ship structures. The significance of stress concentration effect on buckling modes in tensioned laminate with circular and elliptical openings is analysed by Muc (2018). Muc and Romanowicz (2017), Muc et al (2017Muc et al ( , 2018a investigated circular and elliptical (vertical and horizontal) holes in composite laminates for static and fatigue damage.…”