具有刚度梯度折纹管能量吸收

ENERGY ABSORPTION OF PRE-FOLDED TUBE WITH STIFFNESS GRADIENT

为了解决传统薄壁方管在遭受冲击时最大峰值力大且吸能效率低等问题,通过在方管表面引入折痕,提出了一种八边形折纹管。应用有限元软件Abaqus/Explicit模拟了其在准静态压缩下的变形模式和吸能情况。结果表明,相较于普通方管,折纹的引入降低了最大峰值力Pmax,提高了平均压溃力Pm,且形成了刚度梯度折纹管,使得在压缩前期产生较小的支反力,有利于保护主结构。随着压缩量的增大,支反力随之增大,从而提高折纹管的吸能性能。通过对折纹管的标准段个数M、c/l和b/t等参数对吸能性能影响的研究,获得了提高折纹管吸能性能的优化折纹管结构,为汽车吸能构件的应用提供了参考。

In order to solve the problems of high peak force and low energy absorption efficiency of traditional thin-walled square tubes during impact,the octagonal pre-folded tube was proposed by introducing creases on the surface of square tubes.The finite element software ABAQUS/Explicit was used to simulate the deformation mode and energy absorption under quasi-static compression. The results show that,compared with the square tube,the introduction of crease reduces the maximum peak force Pmax,increases the mean crushing force Pm,and forms the stiffness gradient crease tube,which produces a small crush force in the early stage of compression,which is beneficial to protect the main structure. With the increase of compression,the reaction force increases,and the energy absorption performance of the folded tube is improved Based on the study of the influence of the number of standard segments M,c/l,and b/t on the energy absorption performance of the pre-folded tube,the optimized structure of the pre-folded tube to improve the energy absorption performance of the pre-folded tube is obtained,which provides a reference for the application of the automobile energy absorption components.