Colloquium: Lander Vertonghen (ASM)

13 december 2019 12:00 - Locatie: Lecture Room G, Faculty of Aerospace Engineering, Kluyverweg 1, Delft.

Semi-analytical buckling simulation and optimisation of variable stiffness, variable thickness laminates.

Variable Angle Tow manufacturing methods bring constraints and introduce defects into the final product. One of these defects is the formation of overlaps, resulting in one sided thickness build-up of the laminate. However, this phenomenon was reported in literature to be beneficial for the structural performance. Therefore, this research aims at simulating the impact of the overlaps on linear buckling in a semi-analytical way, by approximating the discrete overlaps with a smeared formulation based solely on the manufacturing angle. This approximation was found to be in good agreement for buckling in different cases. Afterwards, this approximated thickness profile is used to optimise variable thickness and stiffness laminates, which are subsequently compared to optimised variable stiffness with uniform thickness laminates. It was found that at isomass, the variable thickness cases perform at least on par with their uniform counterpart, with higher gains in unsymmetrical conditions.