通过非均匀结构显著提高预折叠管的能量吸收能力

Greatly improving the energy absorption capacity of pre-folded tubes via non-uniformizingg structures

在薄壁管中引入预折叠图案已被证明可以有效增强其能量吸收能力.然而,仅仅靠预折叠图案设计所提高的能量吸收能力已经达到天花板,难以进一步提高。本研究为解决这一问题,提供了一种全新的技术路线.我们首先设计了一种结构均匀的预折叠薄壁管作为参考结构.然后,我们对参考结构的壁厚进行非均匀化设计。在保持薄壁管总质量不变的情况下,加厚了塑性变形相对较大的局部区域的壁厚,同时变薄了塑性变形相对较小的局部区域的壁厚。这种非均匀设计方式使薄壁管的整体变形更加协调,不仅显著提高了结构的比吸能(SEA),而且降低了峰值力(PCF),实现了SEA和PCF的更优组合.

Introducing origami patterns to the thin-walled tubes has been proven to effectively enhance the energy-absorbing capacity.However,the energy-absorbing capacity improved by pattern design alone has reached the ceiling and is difficult to improve further.In the present study,we provided a brand new technical route to solve this problem.We firstly designed a pre-folded thin-walled tube with uniform structure as the reference structure.We then made the wall thickness of the reference structure unhomogenized.Keeping the total mass of the tube unchanged,we thickened the wall thickness of the local region with relatively large plastic deformation,at the same time thinned the wall thickness of the local region with relatively small plastic deformation.Such non-uniform design makes the overall deformation of the thin-wall tube more harmonize,not only significantly increasing the specific energy absorption(SEA),but also decreasing the peak crushing force(PCF),achieving a superior combination of SEA and PCF.