圆形手性多胞管轴向冲击下的耐撞性分析

Crashworthiness Analysis of Circular Chiral Multicellular Tubes under Axial Impact

提出了不同几何结构的新型圆形手性多胞管,开展了其在相同壁厚、相同质量条件下的耐撞性分析。研究结果表明:与传统圆管相比,圆形手性多胞管具有更好的耐撞性能;相同壁厚条件下,比能量吸收和冲击力效率比传统圆管最高分别高出66.19%和49.11%;吸能效果最好的CCMT7-20(肋板数量为7、内圆直径为20 mm)与耐撞性能最差的CCMT4-40(肋板数量为4、内圆直径为40mm)的圆形手性多胞管相比,比能量吸收和冲击力效率分别高出30.83%和22.87%。肋板数量、内圆直径和壁厚对结构耐撞性的参数化研究表明:能量吸收、初始峰值力均随着肋板数量增加而增大,比能量吸收随着肋板数量的增多变化并不明显。能量吸收、比能量吸收和冲击力效率均随着内圆直径增大而减小,管壁增厚会提升结构的能量吸收,但其初始峰值力也会相应增大。

A new type of circular chiral multicellular tube with different geometric structures was proposed,and its crashworthiness was analyzed under the condition of the same wall thickness and mass.The results show that the circular chiral multicellular tube has better crashworthiness than the traditional circular tube.Under the same wall thickness,the specific energy absorption and crush force efficiency of the present structure are 66.19% and 49.11% higher than the traditional circular tube,respectively.The circular chiral multicellular tube of CCMT7-20(7 ribs,20 mm inner circle diameter) has the best crashworthiness.Compared to the circular chiral multicellular tube of CCMT4-40(4 ribs,40 mm inner circle diameter) with the worst crashworthiness,the energy absorption of CCMT7-20 is 795.35 J higher,and its specific energy absorption and crush force efficiency are 30.83% and 22.87% higher,respectively.The parametric study of the effects of the number of ribs,diameter of inner circle and wall thickness on the crashworthiness of the structure shows that the energy absorption and initial peak force increase with the increase of the number of ribs,but the specific energy absorption does not change significantly with the increase of the number of ribs.The energy absorption,specific energy absorption and crush force efficiency all decrease with the increase of inner circle diameter.The increase of wall thickness will increase the energy absorption of the structure,but the initial peak force will also increase.