When a periodic cellular structure is subjected to high-intensity loading, lateral splashing can occur, significantly decreasing macro mechanical properties. Periodic structures with self-locking properties can overcome this inherent flaw and achieve excellent performance characteristics, including high energy absorption efficiency. In this regard, thin-walled periodic self-locking dissipative structures have been extensively studied recently. Most existing bend-dominated self-locking dissipative systems are two-dimensional and can only achieve self-locking under specific loading conditions. This paper describes a three-dimensional origami-based bidirectional self-locking system that can achieve self-locking under normal and shear loading. Furthermore, a plastic hinge model revealed the energy absorption mechanism of the origami-based cells, whose specific energy absorption (SEA) is higher than that of other existing bend-dominated self-locking cells. The bidirectional self-locking of the origami-based system was demonstrated through compression, bending and impact tests. This origami-based system has high energy absorption efficiency, and the novel bidirectional self-locking mechanism can significantly broaden the design space for periodic dissipative metamaterials.

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基于折纸的能量吸收双向自锁系统

当周期性蜂窝结构受到高强度载荷时，可能会发生横向飞溅，从而显着降低宏观力学性能。具有自锁特性的周期性结构可以克服这种固有缺陷并实现优异的性能特征，包括高能量吸收效率。在这方面，薄壁周期性自锁耗散结构最近得到了广泛的研究。现有的大多数以弯曲为主的自锁耗散系统都是二维的，只能在特定的载荷条件下实现自锁。本文描述了一种基于三维折纸的双向自锁系统，该系统可以在正常和剪切载荷下实现自锁。此外，塑料铰链模型揭示了折纸电池的能量吸收机制，其比能量吸收（SEA）高于其他现有的弯曲主导的自锁电池。通过压缩、弯曲和冲击测试证明了基于折纸的系统的双向自锁性。这种基于折纸的系统具有高能量吸收效率，新颖的双向自锁机制可以显着拓宽周期性耗散超材料的设计空间。