凹星形三维负泊松比结构设计及冲击吸能特性

Negative Poisson's ratio structures have considerable application prospects in the field of energy absorption due to their abnormal deformation mechanism. A novel negative Poisson ' s ratio structure with adjustable parameters was designed and characterized. The static/dynamic mechanical properties and energy absorption characteristics were systematically studied using a combination of theoretical and numerical simulation research methods. The research results show that the new structure has excellent mechanical properties and adjustable parameters. Under static compression conditions, the new structure has higher stiffness and better energy absorption performance, with a specific energy absorption value 2. 64 times that of the concave honeycomb structure and 3. 89 times that of the star-shaped honeycomb structure. Under dynamic impact conditions, the energy absorption performance of the concave-star structure is better than that of the two traditional honeycomb structures (concave and star-shaped) at low elocity, and its energy absorption advantage degrades at medium and high velocities, which is equivalent to the concave honeycomb structure but much higher than the star-shaped honeycomb structure.