Abstract
This paper deals with a new stacking sequence optimization method to maximize fracture strength. In authors' research group, a fractal branch and bound (FBB) method has been proposed for the stacking sequence optimization of laminated composites. The method successfully applied to maximize buckling loads and flutter limit speed of a composite wing. Although the method is quite effective on optimizations related to stiffness of the composite structures, the method leads large error for optimizations on fracture strength when stress-based failure criteria are adopted. In this study, first the mechanism of giving a large error will be revealed. Next, a modified FBB method for optimization to maximize fracture strength is proposed, by introduction of a new code into the FBB method. The method successfully optimizes the failure strength maximization problem.
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