Collapse modes and energy absorption performance of conventional and re-entrant hexagonal tubes under lateral compression
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摘要:
六边形薄壁结构被广泛应用于吸能防护领域。为提升六边形薄壁管的吸能性能，对常规六边形薄壁管和内凹六边形薄壁管在横向压缩载荷作用下的变形模式和吸能性能进行对比研究。针对这2种六边形管分别建立考虑应变强化效应的理论模型，运用商业软件ABAQUS进行有限元分析。对比理论模型和有限元分析得到的六边形管变形模式及载荷-位移关系，理论结果和有限元结果具有良好的一致性。针对2种六边形管，分别设置不同的侧边倾斜角，探究不同六边形管在横向压缩载荷作用下的塑性变形行为和吸能性能。结果表明：内凹六边形管相比于对应的常规六边形管具备更优的吸能性能，内凹六边形管的冲程效率和总吸能分别为对应的常规六边形管的1.41~1.62倍和1.79~1.83倍。另外，内凹六边形管所需的横向安装空间更小。
Abstract:Hexagonal thin-walled structures are widely used in the field of energy absorption and protection. To improve the energy absorption performance of hexagonal thin-walled tubes, in this study, a comparative study on the collapse modes and energy absorption performance of the conventional and re-entrant hexagonal tubes under lateral compression was performed. The theoretical models of these two kinds of hexagonal tubes were established and the effect of strain-hardening was taken into account. Then the finite element analyses were conducted by using the commercial software ABAQUS. The deformation modes and force-displacement relations obtained from the finite element analyses were compared with those predicted by the theoretical models. The results of the finite element and theory show a good degree of concordance. The plastic deformation behavior and energy absorption performance of the conventional and re-entrant hexagonal tubes with different inclination angles under lateral compression were explored. It is found that, compared with the conventional hexagonal tubes, the energy absorption performance of the re-entrant hexagonal tubes is better. The stroke efficiency and energy absorption of the re-entrant hexagonal tubes are respectively 1.41~1.62 times and 1.79~1.83 times those of the corresponding conventional hexagonal tubes. In addition, the re-entrant hexagonal tubes requires less installation space.
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Key words:
- hexagonal tube /
- re-entrant structure /
- lateral compression /
- plastic deformation /
- energy absorption
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图 1 常规六边形管和内凹六边形管变形模式
Figure 1. Deformation modes of conventional and re-entrant hexagonal tubes
图 2 常规六边形管横向压缩变形1/4模型
Figure 2. Model of one-quarter of conventional hexagonal tube under lateral compression
图 3 内凹六边形管横向压缩变形1/4模型
Figure 3. Model of one-quarter of re-entrant hexagonal tube under lateral compression
图 4 常规和内凹六边形管有限元模型
Figure 4. Finite element models of conventional and re-entrant hexagonal tubes
图 5 常规六边形管压缩过程Mises应力云图
Figure 5. Mises stress cloud diagram of conventional hexagonal tube under lateral compression
图 6 内凹六边形管压缩过程Mises应力云图
Figure 6. Mises stress cloud diagram of re-entrant hexagonal tube under lateral compression
图 9 不同倾斜角六边形管载荷-位移关系曲线和能量吸收效率-位移曲线
Figure 9. Force-displacement relation curves and energy absorption efficiency-displacement relation curves of hexagonal tubes with different inclination angles
图 10 不同倾斜角六边形管载荷-位移关系曲线
Figure 10. Force-displacement relation curves of hexagonal tubes with different inclination angles
图 11 不同倾斜角六边形管冲程效率
Figure 11. Stroke efficiency of hexagonal tubes with different inclination angles
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