Multiple synergistic effect and mechanical enhancement of lotus petiole

Abstract

The curved petiole of lotus makes it more flexible, absorbs much more energy, resists shear forces and torsion performance. Multiple synergies effectively ensure the integrity of the overall lotus, no matter how the lotus leaf deforms, the petiole is hard to break. In addition, the surface of the petiole is covered by millimetre cone (MC) arrays. The root of the MC has smooth curvature and forms a stable transition in the interface of cone and petiole, the load transfer from stalk to MC could inhibit the deformation of petiole and increase the fracture limit. Thus, the stability of lotus leaves and petiole is guaranteed by the synergy effect between the curve section and MC on the surface. In this study, a polymethyl methacrylate -based bionic fabricated curved bar with MC arrays is fabricated by 3D printing technology. Compared with the straight bar, this designed bar shows good performance in anti-bending, anti-twisting and anti-stretching. Further, this bar is mounted on a stool to achieve a stable mechanical function. In the application, this design not only improves the comfort of the experience, but also improves the safety factor. This research has potential applications in the biomimetic field, ski pole, and construction.