LAUSR

Seeking for innovative structures with higher mechanical performance is a continuous target in railway vehicle crashworthiness design. In the present study, three types of hexagonal reinforced honeycomb-like structures were developed and analyzed subjected to out-of-plane compression, namely triangular honeycomb (TH), double honeycomb (DH) and full inside honeycomb (FH). Theoretical formulas of average force and specific energy absorption (SEA) were constructed based on the energy minimization principle. To validate, corresponding numerical simulations were carried out by explicit finite element method. Good agreement has been observed between them. The results show that all these honeycomb-like structures maintain the same collapsed stages as conventional honeycomb; cell reinforcement can significantly promote the performance, both in the average force and SEA; full inside honeycomb performs better than the general, triangular and double schemes in average force; meanwhile, its SEA is close to that of double scheme; toroidal surface can dissipate higher plastic energy, so more toroidal surfaces should be considered in design of thin-walled structure. These achievements pave a way for designing high-performance cellular energy absorption devices. 探寻更优力学性能的轻质新颖结构一直是轨道车辆耐撞性设计持续追求的目标。为此,分析了 三种增强型类蜂窝结构的异面压缩吸能特性,包括三角增强型、双层增强型和全填充增强型。基于最 小能量原理构建了各型增强蜂窝结构的平均力、比吸能的理论表达式,并采用显式有限元数值模拟 方法验证,结果吻合较好。所得结果表明:此三型类蜂窝结构维持了与常规蜂窝结构一致的压缩历程; 胞元增强可显著提升类蜂窝结构的平台载荷与比吸能;相比于其它增强形式,全填充增强型类蜂窝 结构与双层增强型结构具有相当的比吸能,但其平台载荷更高;折角单元环形曲面可耗散更多的塑性 能,应考虑增加更多折角单元以提升耗能水平。所得结果为轻质多孔高性能能量吸能装置设计提供 参考。