Mechanical behavior of composited structure filled with tandem honeycombs
Mechanical behavior of composited structure filled with tandem honeycombs
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串联蜂窝填充复合结构的力学行为
DOI：
10.1016/j.compositesb.2017.01.018
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发表时间：
2017-04-01
影响因子：
13.1
通讯作者：
Hui, David
中科院分区：
文献类型：
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作者：
Wang, Zhonggang;Liu, Jiefu;Hui, David
近年来，如何显著提高蜂窝结构的吸能性能引起了人们的广泛关注。串联蜂窝作为一种潜在的极好的出路，已经兴起并迅速普及。在本工作中，串联六边形蜂窝结构的轴向压缩进行了全面的实验与普通，强度梯度，和预压试样，分别。研究了各种串联蜂窝结构的力学行为。虽然在这些试样中观察到高度随机的变形序列，串联蜂窝结构仍然表现为在压缩载荷下的一般件的蜂窝块的完美的响应。此外，串联蜂窝结构在预压缩后表现出较好的力学性能，呈现稳定的类矩形压缩历史，后续段没有出现初始峰值力。在此基础上，采用均匀化本构模型对串联蜂窝吸能器进行了数值模拟，并通过实验验证了模型的正确性。通过对匹配效应和多胞效应的数值分析，讨论了侧向加强结构和多胞结构两种典型的构造模式。结果表明，侧向抗力对结构的变形模式有显著影响，在多室管中填充串联蜂窝结构可以显著改善结构的力学性能。这些研究成果对蜂窝芯复合材料冲击吸能器的设计具有一定的指导意义。(C)2017爱思唯尔有限公司版权所有
Recently, how to significantly improve the energy absorption property of honeycomb structures have drew a lot of attention. As a potential excellent way out, tandem honeycomb has sprang up and rapidly gained popularity. In the present work, comprehensive experiments of tandem hexagonal honeycomb structures subjected to axial compression has been conducted with general, strength gradient, and pre-compressed specimens, respectively. Extensive mechanical behaviors of kinds of tandem honeycomb structures have been demonstrated. Although highly random deformation sequences were observed in those specimens, the tandem honeycomb structure still performed as perfect response as in the general pieces of honeycomb block under compression load. In addition, the tandem honeycomb structure performed a better mechanical behavior and showed a stable, rectangular-like compression history after pre-compression, no initial peak force appeared for subsequent segments. Based on this, numerical simulations for tandem honeycomb-filled energy absorber were conducted using homogenized constitutive model which was validated by experiments. Two typical conformation modes, lateral reinforced structure and multi-cell structure were discussed through numerical analyses on matching effect and multi-cell effect. The results turned out that the lateral resistance has significant influence on deformation mode and filling tandem honeycomb into multi-cell tubes evidently improves the mechanical behavior of such structures. All the achievements shed a light on the design of impact energy absorbers which consisted of composited honeycomb cores. (C) 2017 Elsevier Ltd. All rights reserved.