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For both polyimide membranes in aerospace and graphene membranes in nanoelectronics with surface accuracy requirements,wrinkles due to the extreme out-of-plane flexibility yield inverse influences on the properties and applications of membranes.In this study,on the basis of discrete topology optimization,we propose a pre-necking strategy by adopting elliptical free edges to suppress the stretch-induced wrinkling.This pre-necking strategy with the CAD-ready format is versatile to eliminate wrinkles in stretched membranes with clamped ends and achieve wrinkle-free performances.