Simultaneous optimization of stiffeners' layout and of composite laminate properties on a stiffened composite space launcher skirt
Abstract
Combining the high stiffness-to-mass ratio of both stiffened structures and of composite materials, as well as their capacity of tailoring the local stiffness properties of a structure can contribute to further lighten already highly optimized space-launcher structures. In the present work, a componentbased topological optimization method, which is aimed to design stiffening paths, is coupled with a bi-level optimization approach of composite laminates. This enables the optimization of the stiffening paths (number, location and geometry of stiffeners) simultaneously with the material and thickness properties of composite laminates, demonstrating a significant gain in structural performances compared to a metallic stiffened structure of equivalent mass. Mots clés-Stiffener layout optimization, component-based method, bi-level optimization of composite laminates, polar formalism.
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