Citation

Yao RY, Zhao ZY, Yin GS, Zhang B. Int. J. Crashworthiness 2021; 26(1): 77-86.

Copyright

(Copyright © 2021, Informa - Taylor and Francis Group)

DOI

10.1080/13588265.2019.1687162

PMID

unavailable

Abstract

Grooved tube has proved to be an effective energy absorber due to its excellent controllability during axial crushing. In the present research, a novel energy absorber named two-stage grooved tube is proposed. Three approaches are put forward to improve the material utilisation of grooved tube by reducing the dimensions of thick-walled section. In addition, to enhance the stability and energy absorption performance, aluminium foam is filled in empty grooved tube. An analytical model for foam-filled grooved tube is established, and in which a semi-empirical constant to reflect the tube-foam interaction is determined by fitting test data. The experimental results show that the empty grooved tube with weak thick-walled section always generates non-axisymmetric mode, while the foam filling can significantly improve the structural stability by transiting the non-axisymmetric mode into axisymmetric mode. Foam filling can also obviously enhance the energy absorption performance of empty grooved tube with strong thick-walled section, and all foam-filled cases shows typical two-stage energy absorption characteristics. Moreover, reducing the thickness and length of thick-walled section both can improve the material utilisation of foam-filled grooved tube, while the latter can also significant enhance the energy absorption performance.

Language: en

Keywords

crashworthiness; foam filling; Grooved tube; material utilisation; multi-stage energy absorption; stability