<p>The strain localization in metallic materials directly affects their performance in engineering applications, making it essential to enhance their deformation capability. Drawing inspiration from the widespread tendril–pole configurations in plants, previous studies proposed a novel bioinspired chiral composite structure. Building on this concept, this study further investigates a modified structural design. Unlike previous studies assuming fully bonded interfaces, this design introduces sliding contact between the reinforcing and base materials to better capture real-world interfacial behavior. Winding helical strips around a metal rod can significantly increase the rod’s failure strain. A combination of theoretical analysis and numerical simulation is employed to study this design. A theoretical model describing the enhancement strategy of the composite rod structure with helical winding strips is established. Based on the simulation results, the effects of the strip’s material properties, geometry, cross-sectional parameters, and interfacial contact conditions on the mechanical response and failure mode of the composite rods are analyzed. Helical strips are found to mitigate strain localization, leading to a marked increase in the ductility of the structure. By tuning the material properties of the constituent and the structural parameters, the mechanical performance of this design can be readily optimized, making the strategy applicable to various ductile metamaterials.</p>