Impact Resistance Investigation of Hierarchical Columnar Structures Driven by Circular Sub-cells under Sxial Load

doi:10.3901/JME.2023.02.212

Abstract

Abstract: To solve low energy absorption efficiency, and further improve the energy absorption performance of the single walled structure, a design method of hierarchical columnar structures based on circular subcellular elements is proposed, and establishes the geometric and numerical models of square and circular hierarchical thin-walled columns, and investigates the axial impact resistance of hierarchical columnar structures by the experimental test, the energy absorption performance of the hierarchical columnar structures is found to be much better than that of the single walled structure with the same mass. In addition, the influence of the geometric parameters (the wall thickness t and the diameter of subcellular D) on the energy absorption properties of the hierarchical columnar structures is further investigated numerically, and it is found that the wall thickness t has a positive effect on the energy absorption capacity of the hierarchical columnar structures, the ratio t/D of the wall thickness to the diameter of the subcellular determines the deformation mode of the hierarchical columnar structures, therefore, a hierarchical column structure design criterion based on t/D is established. Moreover, a theoretical model of the mean crushing force of the hierarchical column based on the super folding element theory is further developed, and reveals the intrinsic relationship between energy absorption mechanism and the mean crushing force of the hierarchical columnar structures, and theoretical prediction results are good agreement with the numerical results of the square and circular hierarchical columnar structures with different thicknesses, therefore, the prediction accuracy of the theoretical model is validated well. The study is a good guide for the design of lightweight energy absorbing structures with high energy absorption efficiency.

Key words: hierarchical columnar structure, circular subcellular element, energy absorption, theoretical prediction

CLC Number:

U463

YOU Yi, ZHANG Yong, SU Liang, DUAN Nian. Impact Resistance Investigation of Hierarchical Columnar Structures Driven by Circular Sub-cells under Sxial Load[J]. Journal of Mechanical Engineering, 2023, 59(2): 212-222.

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