Negative stiffness metamaterial with elastic energy dissipation based on conical shell: theoretical solution and experimental study

Negative stiffness (NS) metamaterials with the capability of elastic energy dissipation have gained substantial attention for their potential in shock absorption and vibration control. However, their practical application is often limited by their strength and stiffness. This study investigates an NS material that generates the NS phenomenon based on stretching and rotation of conical shells, akin to coned disk springs. This approach enhances the strength and loading capacity of the material compared to metamaterials based on conventional beam or shell structures. To fully understand the behavior of this material, a theoretical framework is presented, followed by a comprehensive validation process involving tests and numerical simulations. The applicability and constraints of the theoretical solution are discussed, and a parametric analysis is undertaken based on the solution. Finally, NS metamaterials based on the proposed mechanism are fabricated and tested, which showcases their strength and elastic energy dissipation capacity.