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首页> 外文期刊>Physica status solidi, B. Basic research >Enhancement of the in-plane stiffness of the hexagonal re-entrant auxetic honeycomb cores
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Enhancement of the in-plane stiffness of the hexagonal re-entrant auxetic honeycomb cores

机译：增强六角形凹入型膨胀蜂窝芯的平面内刚度

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摘要

In the present work, two new designs of honeycomb structures were presented based on the basic re-entrant structure namely, splined-reentrant and stiffened-reentrant honeycombs. The new structures were designed in order to enhance the in-plane stiffness and maintaining the auxetic behavior of the structure. In this study, finite elements modeling and experimental work were carried out to evaluate the in-plane properties of the new designs. The effect of the geometrical parameters such as rib length and rib thickness of the unit cell of the new designs on the in-plane properties was investigated. Finite elements results showed that the in-plane stiffness of the new designs was improved significantly compared to the basic re-entrant structure. Also, the stiffened-reentrant structure showed better enhancement of the stiffness than the splined-reentrant structure. For example the modulus of elasticity of the stiffened-reentrant structure exceeds 16x that of the basic re-entrant structure in x-direction and was over two times in the y-direction with lower values of the negative Poisson's ratio. Compression tests were carried on honeycomb samples made of steel using laser cutting technique with different geometrical parameters. Test results for the three designs were compared with the finite element results and they were in a good agreement.
机译：在目前的工作中，基于基本凹入结构，提出了两种新的蜂窝结构设计，即花键凹入和刚硬凹入蜂窝。设计新结构是为了增强平面内刚度并保持结构的拉力行为。在这项研究中，进行了有限元建模和实验工作，以评估新设计的面内特性。研究了新设计的晶胞的几何参数（如肋骨长度和肋骨厚度）对面内性能的影响。有限元结果表明，与基本凹入结构相比，新设计的面内刚度得到了显着改善。而且，加硬凹入结构比花键凹入结构显示出更好的刚度增强。例如，加强凹入结构的弹性模量在x方向上超过基本凹入结构的弹性模量，并且在y方向上是负凹泊松比值较低的两倍。使用激光切割技术对具有不同几何参数的钢制蜂窝状样品进行压缩测试。将这三种设计的测试结果与有限元结果进行了比较，它们具有很好的一致性。

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