Abstract
The purpose of this paper is to propose a novel lotus root filled tube (LFT) for improving the energy absorption capability of crash box under axial impact loading. The LFT consists of a lotus root like core and a basic tube (BT). Firstly, a finite element (FE) model of the LFT is established. Secondly, the FE model is used to study the energy absorption capability of LFT with variations in the thickness of square tube (t 1), the thickness of lotus root like core (t 2), the height of the cell structure (h), as well as the length of the cell structure (l 1 , l 2). Finally, to determine the optimal geometric parameters, multiobjective design optimization (MDO) is performed by integrating optimal Latin hypercube sampling (OLHD), response surface method (RSM) and non-dominated sorting genetic algorithm-II (NSGA-II). The results have demonstrated that the proposed LFT has great energy absorption efficiency and is able to improve vehicle crash performance under frontal impact loading.
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