Abstract
Stiffened panels with curved stiffeners have shown a potential for structural tailoring of metallic panels. However, the optimal placement of the stiffener curves has remained a challenge, both due to the presence of multiple local minima in the design space, as well as the associated CPU cost to solve the problem. This paper presents a new approach to designing the stiffener curves based purely upon the first buckling mode of the unstiffened panel. The approach defines a heuristic metric for the effectiveness of a stiffener in increasing the buckling load capacity of a panel. The stiffener curve with the highest metric should then provide the lowest optimum mass for the stiffened panel. Optimization results with parametric studies show that the approach provides an extremely cost effective method to obtain stiffener curves giving near-optimal panel weight.
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