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Journal of Composite Materials
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0021998308094967v1
42/21/2259    most recent
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Optimal Design of Composite Stiffened Panel with Cohesive Elements using Micro-Genetic Algorithm

Soo-Hyun Kim

Department of Aerospace Engineering, School of Mechanical Aerospace and System Engineering, KAIST 373-1 Guseong-dong Yuseong-gu, Daejeon, 305-701, Republic of Korea, cgkim{at}kaist.ac.kr

Chun-Gon Kim

Department of Aerospace Engineering, School of Mechanical Aerospace and System Engineering, KAIST 373-1 Guseong-dong Yuseong-gu, Daejeon, 305-701, Republic of Korea

A postbuckling analysis for composite stiffened structures is a representative nonlinear analysis, but is difficult to obtain analysis results and a lengthy computational time is required. In this study, an accurate and realistic postbuckling model for a stiffened composite panel is made, and optimization module is studied. In order to predict the realistic behavior in the postbuckling region, cohesive elements were introduced to the analysis model to account for skin-stiffener debonding. The global behaviors and failure loads of the analysis results were found to be similar to the experimental results. Based on this analysis model, the optimal layer design of a composite stiffened panel up to postbuckling failure was performed using micro genetic algorithm. The optimized result showed a higher maximum failure load in the postbuckling region.

Key Words: postbuckling • composite stiffened structure • cohesive element • optimization • micro GA.

This version was published on November 1, 2008

Journal of Composite Materials, Vol. 42, No. 21, 2259-2273 (2008)
DOI: 10.1177/0021998308094967
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