Technological watch

Advanced structure design for energy absorption is a long?lasting pursuit due to its fascinating scientific merit in mechanics and important engineering application. Curves, a type of mathematical variation in geometry, have been widely adopted in the biological system and biomaterial structures after long?time nature evolution towards optimization and adaption. Inspired by nature, we design a novel type of tubular structure with golden spiral curvature. With the variations in the hierarchy of the supporting spirals and the number of arms, we demonstrate a maximum of 38.8% increase in performance over an uncurved counterpart structure. Our computational modeling reveals that the additional added golden spiral arms within the tube enhance the rigidity and increase the energy dissipation via progress buckling involved by additional materials such that the energy absorption upon crushing is significantly improved. Theoretical models then provide intrinsic underlying mechanics analysis with more intuitive design guidance for such structures. Results develop an efficient yet simple design based on widely accepted tubular structure design for impact protection, enrich the mechanistic understanding of the nonlinear buckling behaviors, and provide applicable design guidance for engineering structures.This article is protected by copyright. All rights reserved.