Design optimization of the step/scarf repair of an aeronautical panel targeting the maximum compressive strength and the minimization of material removal

Abstract

The design and evaluation of different elliptical composite repair patches, for the purpose of forming an optimum patch design, is a complex and time-consuming process. Geometry and effectiveness of a repair patch depend on various parameters, such as length of step, dimensions of major and minor semi-axes of each ply’s ellipse, as well as on each ply’s ellipse’s eccentricity. The optimum values of the previously mentioned parameters are strongly related to layup and loading conditions. Consequently, examination of many different patch geometries is crucial, in order to find an optimum patch which will meet the needs and demands of strength and geometric restrictions of a mechanical problem