The Push Drill Mechanism as a Novel Method to Create 3D Mechanical Metamaterial Structures,Physica Status Solidi-Rapid Research Letters

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The Push Drill Mechanism as a Novel Method to Create 3D Mechanical Metamaterial Structures
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-05-14 , DOI: 10.1002/pssr.202000125
Pierre-Sandre Farrugia ₁ , Ruben Gatt ₁ , Joseph N. Grima ₁

Affiliation

Two of the most prominent 2D auxetic mechanisms, namely, the rotating rigid unit and the chiral systems, work, at least partly, by converting linear to rotational motion. This property can be harnessed by introducing a system that can convert back the rotational motion to a linear displacement so as to induce an expansion or a compression in the out‐of‐plane direction. The push drill mechanism offers an effective way of providing this capability. It is, hence, possible to couple 2D rotating rigid unit or chiral structures to the push drill mechanism to create novel 3D auxetic structures. The resultant Poisson's ratio in the out‐of‐plane direction can be both negative and positive depending on the connectivity. Herein, the concept is illustrated with the use of rotating squares. An analytical model is derived to determine the parameters on which Poisson's ratio and Young's moduli depend. Subsequently, the analytical results are compared with those obtained from experimental testing of different sample structures with the two showing good agreement. Further considerations indicate that it is possible to design 2D and 3D auxetic systems with the push drill as the only deformation mechanism.

中文翻译：

推钻机制是创建3D机械超材料结构的新方法

两种最显着的2D动力机制，即旋转的刚性单元和手性系统，至少部分地通过将线性运动转换为旋转运动而起作用。可以通过引入可以将旋转运动转换回线性位移的系统来利用此属性，从而在平面外方向上引起膨胀或压缩。推钻机构提供了一种提供此功能的有效方法。因此，有可能将2D旋转刚性单元或手性结构耦合到推钻机构，以创建新颖的3D膨胀结构。取决于连接性，面外方向上的最终泊松比可以为负也可以为正。在此，通过使用旋转方块来说明该概念。导出分析模型以确定泊松比和杨氏模量所依赖的参数。随后，将分析结果与通过不同样品结构的实验测试获得的结果进行比较，两者显示出很好的一致性。进一步的考虑表明，可以将推钻作为唯一的变形机构来设计2D和3D声学系统。

更新日期：2020-05-14

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