To further improve the crashworthiness of multi-cell structures under axial loading, a novel multi-cell thin-walled structure with varying cross-sectional shapes, formed by rotating internal ribs of the traditional multi-cell structure, was proposed. Hence, cells in the same cross-section appeared inhomogeneous characteristics. Combined with experimental and numerical finite element methods, the crashworthiness of multi-cell structure and varying cross-sectional multi-cell structure with different positions of rotation axes, rotation angles and wall thickness was compared by regarding peak crushing force and special energy absorption as indicators. Furthermore, to explore the potential of the crashworthiness of the multi-cell structure in varying cross-section, the multi-objective optimization was performed by dint of Kriging approximation techniques and multi-objective particle swarm optimization (MPSO) method. The Pareto frontier and the optimized parameter matching under different design requirements were obtained. The results show that the position of rotation axes, rotation angles and wall thickness have significant influences on the specific energy absorption of multi-cell structure in varying cross-section, but the position of rotation axes and rotation angles have a limited effect on peak crushing force. Moreover, the specific energy absorption of the multi-cell structure in varying cross-section is about 8% higher than that of the traditional multi-cell structure. When the maximum peak of crushing force is limited in the range of 180 kN, the optimal design parameters of wall thickness t and the rotation angle θ are 1.52 mm and 1.85 degrees respectively.
Key words
automotive engineering /
multi-cell thin-walled structure /
experimental research /
crashworthiness /
energy absorption /
Kriging approximate technology
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