Publications

Chen, N.-Z. and Guedes Soares, C. (2006), “Buckling Analysis of Stiffened Composite Panels”, Proceedings of theIII European Conference on Computational Mechanics Solids, Structures and Coupled Problems in Engineering (ECCM´06), C.A. Mota Soares et.al. (Eds.), 5-8 June, Lisbon, Portugal

In view of their high specific strength and specific modulus, stiffened composite panels have been widely used in modern engineering fields. However, stiffened composite panels can develop buckling failure under service conditions as they are generally very thin. It is thus essential to have a thorough understanding of the buckling behavior of stiffened composite panels to permit them to be designed efficiently with high reliability and safety. This paper is to describe an effective method for prediction of the buckling strengths of stiffened composite panels with various types of stiffeners, and to perform a parametric study of investigation of the effects of initial imperfections, boundary conditions, stacking sequence and lamina thickness on buckling strengths. The accurate buckling analysis of stiffened composite panels can be achieved by an incremental nonlinear finite element analysis. However, the complete incremental nonlinear solution of a stiffened composite panel up to buckling is in general expensive and thus a linearized buckling analysis for lowest buckling loads based on a degenerated shell element and the nonlinear finite element analysis is given in the present paper. In this method, it is assumed that the pre-buckling deformations of the structure are small and buckling analysis of stiffened composite panels is considered as an eigenvalue problem.

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