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球状张拉整体式超结构的可恢复吸能与损伤容限行为研究

RECOVERABLE ENERGY ABSORPTION AND DAMAGE TOLERANCE OF SPHERICAL TENSEGRITY-INSPIRED METASTRUCTURES

  • 摘要: 材料与结构的失效往往源于局部化变形, 如剪切带形成、裂纹扩展或单根杆件屈曲诱发的整体塌缩. 对于轻质结构而言, 这类局部化机制易导致承载能力突降和灾变破坏, 限制其在大变形吸能与重复防护场景中的应用. 本文提出一种球状张拉整体式超结构, 通过离散受压环路和多路径传力网络诱导非局部协同变形, 以提高结构的可恢复吸能能力和损伤容限. 该结构以球状张拉整体单胞结构为基础, 经镜像反射与仿射配准组装形成群体结构, 从而构建离散受压环路和多路径传力网络. 通过3D打印制备、准静态压缩、循环加载、小球自由落体冲击实验和有限元模拟, 结果表明, 该拓扑主要通过杆件弯曲、扭转、节点旋转和构型重排适应大变形压缩, 并抑制局部塌缩和失稳传播. 相较单胞结构, 群体结构的峰值力、吸收能量和比吸能分别提高至约11.2、11.9和12.4倍, 能量吸收效率由66.2%提高至73.1%. 在10%~30%应变循环压缩下, 每一应变水平下经10次循环压缩后, 结构形成稳定滞回响应, 未出现明显刚度退化或不可恢复失效, 表现出良好的可恢复耗能能力. 细杆、粗杆和双杆损伤后, 结构比吸能分别保持无损伤结构的77.7%、62.8%和38.8%, 且均未发生整体塌缩. 小球冲击实验进一步表明, 局部损伤会延长冲击响应并降低反弹动能, 但结构仍保持整体完整性. 与典型桁架结构相比, 该超结构具有更高的吸能效率和更好的弹性恢复能力. 研究表明, 由离散受压环路和多路径传力网络诱导的非局部协同变形, 为轻质、可重复使用和抗损伤防护结构设计提供了有效构型策略.

     

    Abstract: Failure of materials and structures is often initiated by localized deformation, such as shear-band formation, crack propagation, or the global collapse of space trusses triggered by the buckling of individual struts. In lightweight structures, such localized mechanisms can lead to abrupt loss of load-bearing capacity and catastrophic failure, thereby limiting their use in large-deformation energy absorption and reusable protection scenarios. In this study, a spherical tensegrity-inspired metastructure is proposed to enhance recoverable energy absorption and damage tolerance by inducing nonlocal cooperative deformation through discrete compression loops and multi-path load-transfer networks. Through 3D printing, quasi-static compression, cyclic loading, free-fall ball impact experiments, and finite element simulations, we show that the proposed topology accommodates large compressive deformation primarily through strut bending, torsion, node rotation, and configurational rearrangement, thereby suppressing localized collapse and instability propagation. Compared with the unit-cell structure, the multi-cell structure increases the peak force, absorbed energy, and specific energy absorption by approximately 11.2, 11.9, and 12.4 times, respectively, while improving the energy absorption efficiency from 66.2% to 73.1%. Under cyclic compression at strain levels ranging from 10% to 30%, the structure exhibited stable hysteretic responses after 10 loading–unloading cycles at each strain level, with no obvious stiffness degradation or irreversible failure, demonstrating good recoverable energy dissipation capability. Local damage in thin rod, thick rod, and dual rod reduces the specific energy absorption to 77.7%, 62.8%, and 38.8% of the undamaged value, respectively, yet no global collapse occurs. Ball impact tests further confirm that damaged structures prolong the impact response and reduce rebound kinetic energy while retaining structural integrity. Compared with typical truss architectures, the spherical tensegrity-inspired metastructure exhibits higher energy absorption efficiency and superior elastic recovery. These results demonstrate that delocalized deformation enabled by discrete compression loops and multi-path load transfer provides an effective architectural strategy for lightweight, reusable, and damage-tolerant protective systems.

     

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