Energy absorption properties of tandem honeycomb with dislocated assembly

doi:10.3785/j.issn.1008-973X.2020.12.007

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (12): 2329-2335 DOI: 10.3785/j.issn.1008-973X.2020.12.007

Energy absorption properties of tandem honeycomb with dislocated assembly

Hang-jian WENG1(

),Xiao-juan DANG2,Xiao-jing ZHANG1,*(

)

1. School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 201100, China
2. AVIC Chengdu Aircraft Design and Research Institute, Chengdu 610091, China

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Abstract

The effects of dislocated assembly on the mechanical properties of tandem honeycomb structure were investigated through flatwise compression experiments and full-scale finite element simulation in order to optimize the energy absorption property and enhance the designability of tandem honeycomb structures. Quasi-static out-of-plane compression experiments were carried out on Nomex honeycomb-cored sandwich structures, include three structural forms of single-layer honeycomb, double-layer aligned assembly honeycomb, and double-layer dislocated assembly honeycomb. The deformation processes and the compression response curves of the structures were recorded to analyze the structure deformation mechanism. Experimental results show that the double-layer tandem honeycomb can effectively improve the bearing capacity and the energy absorption property of the honeycomb structure compared to the single-layer honeycomb. Dislocated assembly causes two layers of honeycomb to deform at the same time. Compared with the aligned assembly honeycomb core, dislocated assembly can further increase the plateau stress, eliminate the second peak stress, and greatly improve the bearing capacity and the energy absorption effect. The finite element model which considers the honeycomb core detail was developed to simulate the dislocated assembly effect. The simulation results were in good agreement with the experimental data. The effects of different clapboard materials on the mechanical properties of tandem honeycombs were also verified by the numerical simulation.

Key words： tandem honeycomb dislocated assembly out-of-plane compression energy absorption finite element model

Received: 09 November 2019 Published: 31 December 2020

CLC:

V 257

Corresponding Authors: Xiao-jing ZHANG E-mail: whjnuaa@163.com;zhangxj76@sjtu.edu.cn

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Cite this article:

Hang-jian WENG,Xiao-juan DANG,Xiao-jing ZHANG. Energy absorption properties of tandem honeycomb with dislocated assembly. Journal of ZheJiang University (Engineering Science), 2020, 54(12): 2329-2335.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.12.007 OR http://www.zjujournals.com/eng/Y2020/V54/I12/2329

错位装配串联蜂窝结构缓冲吸能特性

为优化串联蜂窝的缓冲吸能效果与增强蜂窝结构的可设计性，通过平压实验与全尺寸有限元模拟研究装配错位对于串联蜂窝结构力学性能的影响. 采用准静态面外压缩实验，对单层蜂窝、双层对位装配蜂窝、双层错位装配蜂窝3种形式的Nomex蜂窝夹层结构进行测试，通过结构变形过程和响应曲线分析变形机理. 实验结果表明，双层串联蜂窝相比单层蜂窝结构可以有效改善蜂窝结构的承载能力和吸能效果. 错位装配使两层蜂窝同时开始变形，相比对位装配能进一步提升平台应力，消除第2个峰值应力，承载能力和吸能效果均有较大提升. 有限元模型通过建立蜂窝细节模拟错位装配效果，模拟与实验结果具有良好的一致性，同时验证了不同材料隔层对串联蜂窝力学性能的影响.

关键词： 串联蜂窝, 错位装配, 面外压缩, 缓冲吸能, 有限元模型

Fig.1 Direction and dimension of honeycomb core

Fig.2 Top view of tandem honeycomb with dislocated assembly

Fig.3 Honeycomb experiment specimens of each group

Tab.1 Tensile properties of thin film

Fig.4 Stress–strain curve of thin film

Fig.5 Deformation processes of honeycomb groups under flatwise compression

Fig.6 Average stress-strain curves of each group of honeycomb structures

Tab.2 Honeycomb structure experimental performance parameters

Fig.7 Honeycomb structure energy absorption curves of each group

Fig.8 Typical finite element model of group CWC

Fig.9 Experiment and simulation deformation comparison of honeycomb structures（U₃=2 mm）

Fig.10 Comparison of honeycomb structure experiment and simulation

Tab.3 Honeycomb structure simulation results


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