Abstract

The lotus root multi-cellular structure is a novel filling structure with good energy-absorbing properties. In this paper, the relationship between cell geometry and mechanical properties of lotus root multi-cellular structure, and the relationship between cell arrangement and mechanical properties of lotus root multi-cellular structure are studied in detail. Firstly, the 3D printer was used to make the sample and carry out the quasi-static compression test to illustrate the accuracy of the finite element simulation analysis and the feasibility of the manufacturing process of the lotus root multi-cellular structure. Then, by combining the basic tube (BT) and the lotus root filled core, the lotus root filled tube (LFT) is established. And by changing the geometrical parameters of cell structure and the arrangement of cell structure, the energy absorption characteristics of LFT were studied in detail. The results show that the energy absorption ability of LFT is positively correlated with the number of filled columns, while the peak force of LFT is negatively correlated with the number of filled columns. The relationship between energy absorption and angle of cell structure is a quadratic parabola.

摘要

莲藕多细胞结构是一种新型的填充结构，具有良好的吸能性能。本文详细研究了莲藕多细胞结构的细胞几何形状与力学性能的关系，以及莲藕多细胞结构的细胞排列与力学性能的关系。首先利用3D打印机制作样品并进行准静态压缩试验，说明有限元仿真分析的准确性和莲藕多胞结构制造工艺的可行性。然后，通过将基础管（BT）和藕填芯结合起来，形成藕填管（LFT）。并且通过改变细胞结构的几何参数和细胞结构的排列方式，详细研究了LFT的能量吸收特性。结果表明，LFT的能量吸收能力与填充柱数呈正相关，而LFT的峰值力与填充柱数呈负相关。能量吸收与细胞结构角度之间的关系是二次抛物线。