In this study, thermoplastic polyurethane (TPU) honeycombs with ordered macrostructure and microcellular lattice structure was fabricated via the integration of fused deposition modelling (FDM) and solid-state CO₂ foaming. The physical foaming induced and introduced the microcellular structure with cell size of about 2.77-12.27 mm into TPU honeycombs. The influences of microcellular structure on the mechanical property, energy absorption and elastic recovery behavior of TPU honeycombs were systematically investigated. Foamed TPU honeycombs had a maximum energy absorption efficiency of 0.40, which was larger than that of the corresponded unfoamed honeycombs (0.32-0.38) owing to having the microcellular structure. The effects of lateral and vertical directions on elastic and energy absorption behaviors were discussed because of the obvious anisotropy of microcellular TPU honeycombs. The advantages of lightweight, soft touching and anisotropic characteristics make microcellular TPU honeycombs have great prospects in small stress and high stress sensitive applications.

在这项研究中，通过融合熔凝沉积模型（FDM）和固态CO ₂的结合，制造出具有有序宏观结构和微孔网格结构的热塑性聚氨酯（TPU）蜂窝。发泡。物理发泡诱导并向TPU蜂窝中引入了微孔结构，其微孔结构具有约2.77-12.27mm的孔尺寸。系统地研究了微孔结构对TPU蜂窝结构力学性能，能量吸收和弹性回复行为的影响。发泡的TPU蜂窝由于具有微孔结构，其最大能量吸收效率为0.40，比相应的未发泡蜂窝（0.32-0.38）大。由于微孔TPU蜂窝具有明显的各向异性，因此讨论了横向和垂直方向对弹性和能量吸收行为的影响。轻巧的优点