Bioinspired Quasi‐Zero‐Stiffness Structure for Multidirectional Cushioning and Vibration Isolation

Under complex working conditions, multidirectional vibration and impact seriously restrict the stable operation and service life of engineering structures and precision equipment. Traditional cushioning and vibration isolation systems focus on single‐direction nonzero stiffness design, which is difficult to meet the needs of multidimensional impact and vibration coupling conditions. For this reason, this work draws inspiration from efficient energy‐absorbing structures in nature and proposes an integrated bionic quasi‐zero‐stiffness (QZS) structure design strategy that incorporates cuttlefish bone‐mimicking S‐shaped structure with a beetle shell‐mimicking center ring cross structure. It is shown that the S‐shaped cubic cross center ring‐cross structure (S‐CCCRCS) developed through this design strategy exhibits a distinct QZS plateau and achieves outstanding energy absorption performance in the X , Y , and Z directions. Under impact loading, the S‐CCCRCS structure shows excellent cushioning performance with the lowest peak impact loads in all three directions; at the same time, due to its three‐dimensional QZS, the structure achieves highly efficient vibration isolation in the multidirectional low‐frequency range. The bionic composite QZS structure proposed in this work provides a feasible solution for high‐performance, multidirectional cushioning and vibration isolation in the fields such as rehabilitation medicine and smart devices.