圆形子胞驱动的层级柱状结构在轴向载荷下的抗冲击性研究

doi:10.3901/JME.2023.02.212

机械工程学报 ›› 2023, Vol. 59 ›› Issue (2): 212-222.doi: 10.3901/JME.2023.02.212

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圆形子胞驱动的层级柱状结构在轴向载荷下的抗冲击性研究

游乙¹, 张勇¹, 苏亮², 段念¹

1. 华侨大学机电及自动化学院厦门 361021;
2. 厦门金龙联合汽车工业有限公司厦门 361021

收稿日期:2021-12-02 修回日期:2022-10-24 发布日期:2023-03-30
通讯作者: 张勇(通信作者),男,1980年出生,博士,教授,博士研究生导师。主要研究方向为超轻材料与结构的设计及其力学特性、复合材料与结构的一体化设计、电池多物理场耦合设计、车身结构安全性与轻量化设计。E-mail:zhangyong@hqu.edu.cn
作者简介:游乙,女,1999年出生。主要研究方向为超轻材料与结构的冲击特性。E-mail:993681460@qq.com;苏亮,男,1980年出生,高级工程师。主要研究方向为新能源客车、智能网联、NVH、无人驾驶;段念,女,1981年出生,博士,副教授。主要研究方向为硬脆性材料的高效精密加工
基金资助:
国家自然科学基金（52075188，51675190）、厦门市青年创新基金（23502Z20206003）和华侨大学研究生科研创新基金资助项目。

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

YOU Yi¹, ZHANG Yong¹, SU Liang², DUAN Nian¹

1. College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021;
2. Xianmen King Long United Automotive Industry Co., Ltd, Xiamen 361021

Received:2021-12-02 Revised:2022-10-24 Published:2023-03-30

摘要/Abstract

摘要： 为了解决单胞薄壁结构能量吸收效率低的缺陷，进一步改善薄壁结构的防护吸能性能，提出一种基于圆形子胞元的层级柱状结构设计方法，建立方形与圆形层级薄壁柱的几何与数值模型，采用试验研究调查了层级柱状结构的轴向抗冲击性能，发现层级柱状结构吸能性能大大优于相同质量下的单胞薄壁结构；此外，进一步数值调查了层级柱状结构的几何参数（薄壁壁厚t、子胞元直径D）对其吸能特性的影响，发现壁厚t对层级柱的吸能特性有积极作用，且壁厚与子胞元直径的比值t/D对结构的变形模式具有决定性作用。因此，研究也形成了基于壁厚与子胞元直径比值t/D的层级柱状结构设计准则。此外，进一步基于超折叠单元理论对层级柱状结构的平均碰撞力展开了理论预测研究，推导了层级柱状结构在渐进折叠模式下平均碰撞力的理论预测模型，进一步揭示了层级柱状结构的变形与吸能机制与平均碰撞力的内在联系，并且，不同壁厚下方形层级与圆形层级柱状结构的理论预测与数值结果具有较好的一致性，从而验证了层级柱状结构的平均碰撞力理论模型的预测精度。研究结果对具有高吸能效率的轻质薄壁结构的设计具有好的指导意义。

关键词: 层级柱状结构, 圆形子胞元, 能量吸收, 理论预测

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

中图分类号:

U463

游乙, 张勇, 苏亮, 段念. 圆形子胞驱动的层级柱状结构在轴向载荷下的抗冲击性研究[J]. 机械工程学报, 2023, 59(2): 212-222.

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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圆形子胞驱动的层级柱状结构在轴向载荷下的抗冲击性研究

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

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