Abstract Bio-inspired conception is prevailing in structure design due to its mechanical promotion. In this study, crashworthiness analyses of twelve patterns of hexagonal prismatic tubes were numerically investigated by means of Finite Element method, including original hexagonal tube (OHT), full triangular hexagonal tube (FTHT), internal clone hexagonal tube (ICHT), double filled hexagonal tube (DFHT) and their reinforced hierarchical structures. Key crashworthiness indexes of different structures were compared with each other in detail. Corresponding formulas to predict the mechanical performance were derived representatively. As confirmed by both theoretical solutions and numerical results, the energy absorption capacities and deformation modes of the bio-inspired hexagonal prismatic tubes are superior to those of the original ones. Although they contribute substantially to the improvement of energy absorption ability, the different reinforcement ways show their different merits. Self-similar hierarchical designs can greatly increase the stability of the axial collapse process. While the lattice enhancement designs show higher SEA. All achievements in this study provide significant guidelines in the reinforcement design of lightweight structures.

中文翻译：

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仿生六棱柱管在轴向受压下的耐撞性

摘要 仿生概念由于其机械化的推广而在结构设计中盛行。本研究采用有限元方法对原始六边形管(OHT)、全三角六边形管(FTHT)、内克隆六边形管(ICHT)、双填充六边形管等12种图案的六棱柱管进行耐撞性分析。管（DFHT）及其增强的分层结构。对不同结构的关键耐撞性指标进行了详细比较。推导出具有代表性的力学性能预测公式。理论解和数值结果证实，仿生六棱柱管的能量吸收能力和变形模式优于原始管。虽然它们对能量吸收能力的提高有很大贡献，但不同的加固方式显示出不同的优点。自相似分层设计可以大大增加轴向坍塌过程的稳定性。而晶格增强设计显示出更高的 SEA。本研究的所有成果为轻量化结构的加固设计提供了重要的指导。