Energy Absorption Characteristics of Circular Nested HierarchicalMulti-Cell Tubes under Axial Impact
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摘要: 将层级和嵌套相结合，设计了两种不同类型和嵌套方式的圆形嵌套层级多胞管，采用数值模拟方法对其轴向冲击下的吸能特性开展了系统的研究。研究结果表明，无论是相同壁厚还是相同质量，高层级多胞管相比低层级多胞管都具有更好的能量吸收能力。相同壁厚情况下，高层级多胞管的比能量吸收和冲击力效率最高分别高出22.49%和16.55%，与传统圆管相比，层级多胞管的比能量吸收和冲击力效率最高分别高出43.16%和36.45%。相同质量情况下，高层级多胞管的比能量吸收和冲击力效率最高分别提升了21.04%和24.47%。最后，系统地开展了层级数、壁厚等结构参数对圆形嵌套层级多胞管耐撞性的参数化研究。Abstract: Combining hierarchy with nested, two kinds of circular nested hierarchical multi-cell tubes with different nested methods were designed innovatively. The energy absorption characteristics under axial impact were studied by numerical simulation. The results show that the high-level multi-cell tubes have better energy absorption capacity than the low-level multi-cell tubes, regardless of the same wall thickness or the same mass. Under the same wall thickness, the specific energy absorption and crush force efficiency of high-level multi-cell tubes increased by 22.49% and 16.55%, respectively. Compared with the traditional circular tube, the specific energy absorption and impact efficiency of the multicellular tube were 43.16% and 36.45% higher, respectively. Under the same mass condition, the specific energy absorption and crush force efficiency of high-level multi-cell tubes were increased by 21.04% and 24.47%, respectively. Finally, the crashworthiness of circular nested hierarchical multi-cell tubes was studied systematically by the by used structural parameters such as layer number and wall thickness.
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图 1 层级多胞管结构设计示意图
Figure 1. Schematic diagram of hierarchical multi-cell tube structure design
图 3 有限元模型和AA6061O材料属性
Figure 3. Finite element model and material properties of AA6061O
图 6 相同壁厚下圆管的能量吸收和力-位移曲线
Figure 6. Energy absorption and force-displacement curves of tubes with the same wall thickness
图 7 相同壁厚下圆管的变形模式
Figure 7. Deformation modes of circular tube with the same wall thickness
图 8 相同壁厚下圆管的耐撞性数据
Figure 8. Crashworthiness of round tubes with the same wall thickness
图 9 相同质量下圆管的能量吸收和力-位移曲线
Figure 9. Energy absorption and force-displacement curves of tubes with the same mass
图 12 不同层级数的嵌套层级多胞管能量吸收和力-位移曲线
Figure 12. Energy absorption and force-displacement curves of circular nested hierarchy multicellular tubes with different orders
图 13 不同层级数的嵌套层级多胞管的耐撞性分析
Figure 13. Crashworthiness analysis of circular nested hierarchy multicellular tubes with different orders
图 14 不同壁厚圆形嵌套三角形层级多胞管的耐撞性分析
Figure 14. Crashworthiness analysis of circular nested triangular hierarchy multicellular tubes with different wall thicknesses
图 15 不同壁厚圆形嵌套四边形层级多胞管的耐撞性分析
Figure 15. Crashworthiness analysis of circular nested quadrilateral hierarchy multicellular tubes with different wall thicknesses
表 1 相同壁厚条件下不同圆管的耐撞性数据
Table 1. Crashworthiness of different tubes with the same wall thickness
Multicellular tubes h/mm m/kg EA/J ESA/(kJ·kg–1) FI/kN η/% TCT 1.50 0.051 1027.32 20.18 21.50 59.72 CNT-1 1.50 0.093 2248.11 24.17 41.15 68.28 CNT-2 1.50 0.118 3043.65 25.79 53.92 70.55 CNT-3-CC 1.50 0.139 4015.88 28.89 61.60 81.49 CNT-3-CS 1.50 0.139 3850.71 27.70 61.78 77.92 CNQ-1 1.50 0.097 2360.63 24.41 42.69 69.12 CNQ-2 1.50 0.133 3251.87 24.45 59.57 68.24 CNQ-3-CC 1.50 0.165 4382.77 26.56 75.50 72.56 CNQ-3-CS 1.50 0.165 4933.74 29.90 76.56 80.56 
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表 2 相同质量条件下的耐撞性对比
Table 2. Crashworthiness comparison under the same mass
Multicellular tubes h/mm m/kg EA/J ESA/(kJ·kg–1) FI/kN η/% CNT-1 1.04 0.065 1323.63 20.52 26.72 61.93 CNT-2 0.82 0.065 1358.73 21.06 25.94 65.47 CNT-3-CC 0.70 0.065 1384.23 21.46 24.60 70.33 CNT-3-CS 0.70 0.065 1352.52 20.97 24.60 68.74 CNQ-1 1.00 0.065 1388.40 21.53 25.91 66.98 CNQ-2 0.73 0.065 1282.73 19.89 24.49 65.46 CNQ-3-CC 0.60 0.065 1397.43 21.67 23.93 73.00 CNQ-3-CS 0.60 0.065 1681.05 26.06 24.62 83.37
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表 3 层级数对圆形嵌套层级多胞管耐撞性影响的对比
Table 3. Comparation on the effect of order on structural crashworthiness
Multicellular tubes h/mm m/kg EA/J ESA/(kJ·kg–1) FI/kN η/% CNT-1 2.00 0.124 3505.95 28.27 57.54 76.17 CNT-2 2.00 0.158 4820.93 30.51 75.30 80.03 CNT-3-CC 2.00 0.186 5787.84 31.12 87.54 82.65 CNT-4-CC 2.00 0.203 6582.24 32.42 95.66 86.01 CNT-3-CS 2.00 0.186 5797.15 31.17 86.35 83.92 CNT-4-CS 2.00 0.203 6520.47 32.12 95.41 85.43 CNQ-1 2.00 0.129 3427.02 26.57 59.88 71.54 CNQ-2 2.00 0.177 5366.16 30.32 83.24 80.58 CNQ-3-CC 2.00 0.220 6730.04 30.59 105.55 79.71 CNQ-4-CC 2.00 0.254 8475.47 33.37 121.78 87.00 CNQ-3-CS 2.00 0.220 7528.57 34.22 106.56 88.31 CNQ-4-CS 2.00 0.254 8909.80 35.08 122.81 90.69
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