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Crushing and crashworthiness of axially compressed multicelled tubular columns with various bio-inspired thin-walled cross sections

This and the next image are from:
Linwei Zhang, Zhonghao Bai and Fanghua Bai (primarily from: State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan 410082, China),

“Crashworthiness design for bio-inspired multi-cell tubes with quadrilateral, hexagonal and octagonal sections”, Thin-Walled Structures, Vol. 122, pp 42-51, January 2018, https://doi.org/10.1016/j.tws.2017.10.010

ABSTRACT: Multi-cell tubes have been widely used in vehicle engineering for their excellent energy absorption capacity. In this paper, a group of bionic multi-cell tubes (BMCTs) with quadrilateral, hexagonal and octagonal sections were proposed. The BMCTs were constructed by filling the cylindrical tubes into different position of multi-cell tubes (MCTs), which was inspired by the microstructure of beetle forewings. The finite element (FE) models under axial impact loading were established and then validated by the Simplified Super Folding Element (SSFE) theory. The crashworthiness of different BMCTs and MCTs was compared, and the results showed that the sixth type of bionic multi-cell tube with octagonal section (O-BMCT-6) has the best crashing performance. Then, the multiobjective optimization design of O-BMCT-6 was conducted by using non-dominated sorting genetic algorithm II (NSGA-II) and radial basis function (RBF) metamodels. The optimal O-BMCT-6 showed superior crashworthiness and could be used as an energy absorber.

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