【摘要】 力学超结构具有几何结构可编程设计和超轻高强特性，在航天航空等领域展现出广阔的应用前景。已有研究大多集中于力学超结构的面内响应，而对面外弯曲关注相对较少。本研究聚焦一类新型离散组装薄壁管型力学超结构(Discretely Assembled Thin-Walled Mechanical Metastructures, DATWMMs)的弯曲行为，重点研究了该超结构在三点弯曲工况下的力学行为、弯曲机理与能量耗散特性，阐明了关键构型参数对超结构弯曲弹性模量、抗弯强度、吸能特性的影响规律，并给出了抗弯强度的Ashby空间分布。研究结果表明，离散组装薄壁管型超结构的抗弯强度最大约为326 MPa,在相同密度范围内明显优于其他金属结构。此外，正交组装策略使该超结构具有优异的能量吸收性能和结构稳定性。本研究有望为航天航空等领域大尺度结构的轻量化设计与强韧化制造提供新思路。更多还原

【Abstract】 Mechanical metastructures, characterized by their architectural geometries and exceptional mechanical properties, have garnered substantial interest due to their broad application prospects in aviation and aerospace. Although mechanical metastructures have been widely studied under compression and impact, their flexural properties are poorly understood. This study investigates the flexural behavior of a novel class of discretely assembled thin-walled mechanical metastructures(DATWMMs). Based on finite element methods, we systematically characterize the flexural behavior of DATWMMs, elucidating the critical relationship between their architected geometry and mechanical performance. Our findings demonstrate that the discrete assembly strategy enables DATWMMs to achieve exceptional mechanical performance, including a bending strength of 326 MPa outperforming other metallic metamaterials within the same density range, along with superior energy absorption performance and structural stability. This work is expected to provide innovative insights for the lightweight design and toughened manufacturing of large-scale structural in aerospace applications.更多还原