In the present paper the governing equations for corrugated cross-ply laminated composite plates in the form of a sine wave are developed based on the Kirchoff-Love's theory and the extension of Seydel's technique. | Vietnam Journal of Mechanics, VAST, Vol. 28, No . 4 (2006), pp. 197 - 206 NON-LINEAR ANALYSIS ON STABILITY OF CORRUGATED CROSS-PLY LAMINATED COMPOSITE PLATES DAO HUY BICH 1 AND KHUC VAN PHu 2 1 Vietnam National University, Hanoi 2 Military Logistic Academy Abstract. In the present paper the governing equations for corrugated cross-ply laminated composite plates in the form of a sine wave are developed based on the Kirchoff-Love's theory and the extension of Seydel 's technique. By using Bubnov-Galerkin method approximated analytical solutions to the non-linear stability problem of corrugated laminated composite plates subjected to biaxial loads are investigated. The post buckling load-deflection curve of corrugated plates a nd analytical expressions of the upper and lower buckling loads are presented. The effectiveness of corrugated plates in enhancing the stability compared with corresponding fiat plates is given. 1. INTRODUCTION Laminated composite plates and shells are widely used as basic structure components and t heir static and dynamic problems with geometrical non-linearity are of significant practical interest , particularly stability and post-buckling behavior of composite plates and shells is more important. Investigated results in this problem of flat laminated composite plates have been received by many authors [1,3,6,7,9,10,11 ,13]. However, the analysis of corrugated laminated composite plates has received comparitively little attention. Corrugated plates of wave form made of isotropic elastic material were considered as fl at orthotropic plates with corresponding orthotropic constants determined by the Seydel's technique. This approach was acceptable to solve many bending and stability problems of corrugated plates in practice [5,8,12]. In paper [4] the authors developed the Seydel 's technique to the bending problems of corrugated cross-ply laminated composite plates and cylindrical shells. But for the stability problems, besides bending .
