Paper number 500

MULTICRITERION OPTIMIZATION OF LAMINATE STACKING SEQUENCE FOR MAXIMUM FAILURE MARGINS

Petri Kere¹ and Juhani Koski²

1Facultad de Ingeniería, Universidad de la República
J. Herrera y Reissig 565, C.P. 11300, Montevideo, Uruguay
2Applied Mechanics, Tampere University of Technology
P.O. Box 589, 33101 Tampere, Finland

Summary

Multicriterion stacking sequence optimization of composite laminates for maximum failure margins with minimum number of layers is considered. Laminate failure margins to the applied loads are measured in terms of laminate initial failure reserve factors that are computed by applying constant and variable load approach and an iterative line search method. A generalized failure criterion is used to point out that the internal formulation of the failure criterion has no effect on the solution procedure. The actual multicriterion optimization problem to be solved is reduced to a bicriterion problem, where the laminate initial failure reserve factors are combined linearly as the two strongly competing criteria. Discrete design variables for layer orientation identity are utilized in creation of laminate symmetric and balanced stacking sequence permutations. The constraint method is applied to generate maximal solutions. Minimizing the distance from the ideal solution in the criterion space identifies the best-compromise solution.

Keywords

composite laminates, design, multicriterion, multiobjective, optimization, failure analysis, failure margin.