自相似嵌套金属多胞管耐撞性研究

RESEARCH ON CRASHWORTHINESS OF SELF⁃SIMILAR NESTED METAL MULTICELLULAR TUBES

层级多胞结构具有良好的吸能特性,可以广泛应用于汽车、飞机等交通工具的能量吸收装置中。创新性地设计了两种类型的自相似嵌套金属多胞管,通过数值仿真对其轴向冲击下的耐撞性能开展了系统的研究。结果表明,无论是相同质量还是相同壁厚,高阶多胞管相比低阶多胞管都具有更好的能量吸收能力。相同质量情况下,高阶多胞管的比能量吸收最高提升了36.45%,冲击力效率最高提升了35.42%;相同壁厚情况下,高阶多胞管的比能量吸收和冲击力效率最大分别增加了80.40%、59.64%。研究表明,所提出的自相似嵌套金属多胞管相比传统多胞管的耐撞性能具有明显改善。最后,系统地开展了阶数、壁厚等结构参数对自相似嵌套金属多胞管耐撞性能的参数化研究。

The hierarchical multicellular structure exhibits good energy absorption characteristics,which can be widely used in the energy absorption devices of vehicles such as automobiles and airplanes.Two types of self⁃similar nested metal multi⁃cellular tubes were designed,the crashworthiness under axial impact was studied by numerical simulation.The results show that higher order multicellular tubes have better energy absorption capacity than lower order multicellular tubes,regardless of the same mass or wall thickness.With the same mass,the specific energy absorption ratio of higher order multi⁃cellular tubes is up to 36.45%and the crush force efficiency is up to 35.42%.Under the same wall thickness,the maximum specific energy absorption and crush force efficiency of higher order multicellular tubes are increased respectively by 80.40%and 59.64%.The results show that the crashworthiness of the proposed self⁃similar nested metal multicellular tube is significantly improved compared with the traditional multicellular tube.Finally,the parametric study of the structural parameters such as order and wall thickness on the crashworthiness of self⁃similar nested metal multicellular tubes was carried out systematically.