As we all know, compression in one direction will cause expansion in the orthogonal direction for conventional materials. Similarly, stretching in one direction will give rise to contraction in the vertical direction. It is hence possible to combine these two properties to obtain a novel mechanism to create 3D structures with negative Poisson’s ratio (PR) in some directions and positive PR in other ones (partial auxetics). The latitude-and-longitude-inspired double-elliptic-ring structures (DERs) with tunable Poisson’s ratio and Young’s modulus are designed and studied in this work, which offers an effective way for achieving this mechanism. A 3D structure with negative Poisson’s ratio in three directions is also obtained via arranging the DERs alternately. Meanwhile, theoretical results show that the magnitude of Poisson’s ratio of DERs can reach -18.3. Experimental and simulation consequences indicate that the DERs can effectively reduce stress concentration and fracture possibility due to its smooth geometry. Another advantage of DERs is that it still has negative Poisson’s ratio effect under large levels of compression. This work can provide a useful reference for the design of 3D auxetic metamaterials with excellent properties, which is promising in some structural and functional applications.

众所周知，传统材料在一个方向上的压缩会导致在正交方向上的膨胀。同样，在一个方向上拉伸会导致在垂直方向上收缩。因此，可以将这两个属性结合起来以获得一种新颖的机制，以创建在某些方向上具有负泊松比（PR）而在其他方向上具有正PR的3D结构（部分代数）。设计并研究了具有可调泊松比和杨氏模量的经纬度双椭圆环结构（DER），为实现该机理提供了有效的途径。通过交替布置DER，也可以获得在三个方向上具有负泊松比的3D结构。与此同时，理论结果表明，DER的泊松比的大小可以达到-18.3。实验和模拟结果表明，DER具有光滑的几何形状，可以有效降低应力集中和断裂的可能性。DER的另一个优点是，在较大压缩水平下，它仍然具有负的泊松比效应。这项工作可以为设计具有优良性能的3D流变超常材料提供有用的参考，这在某些结构和功能应用中很有希望。