Semi Reentrant structures, which exhibit zero Poisson’s ratio and monoclastic curvature, are combinations of hexagonal Honeycomb and auxetic Reentrant structures. Deflections and strain analysis based on the deformation of unit cells were conducted, and four different equivalent theories for predicting the elastic modulus and Poison’s ratio in two in-plane directions were developed by considering different mechanisms, including flexural, stretching, hinging and shearing deformations, as well as the influence of cell wall thickness. Single sidewall and double sidewall were considered for the cell wall thickness. The theoretical models of Semi Reentrant structures cell could be obtained by assuming that the deformation is a combination of deformation for a hexagonal honeycomb cell (with a positive angle) and a Reentrant cell (with a negative angle). The effectiveness and accuracy of the four theoretical models for Semi Reentrant structures were validated by comparing with the corresponding tensile test simulation results via the finite element method. It was indicated that the fourth theories (T4) were the most accurate, which include the consideration of flexural, stretching, hinging, shearing deformations and cell wall thickness. The influence of geometrical parameters (inclined arm length l, vertical arm length h, angle α, angle β, structure thickness d and cell wall thickness t) on the in-plane tensile properties (elastic modulus and stiffness) was also analysed in tensile test simulations via the finite element method. Comparison of tension results between Semi Reentrant, Reentrant and Honeycomb demonstrated that the mechanical properties of Semi Reentrant were combinations between the others.

呈零泊松比和单碎屑曲率的半凹入结构是六边形蜂巢状和拉长凹入结构的组合。进行了基于晶胞变形的变形和应变分析，并通过考虑不同的机制，包括弯曲，拉伸，铰接和剪切变形，开发了四种不同的等效理论来预测两个平面内方向上的弹性模量和中毒比，以及细胞壁厚度的影响。单侧壁和双侧壁被认为是细胞壁的厚度。通过假设变形是六角蜂窝单元（具有正角）和凹入单元（具有负角）的变形的组合，可以获得半凹入结构单元的理论模型。通过有限元方法与相应的拉伸试验仿真结果进行比较，验证了四个半折返结构理论模型的有效性和准确性。结果表明，第四种理论（T4）是最准确的，其中包括对挠曲，拉伸，铰接，剪切变形和孔壁厚度的考虑。几何参数的影响（倾斜的臂长）此外，还通过有限元方法在拉伸试验模拟中分析了垂直臂长度h，角度α，角度β，结构厚度d和孔壁厚度t）对平面内拉伸性能（弹性模量和刚度）的影响。比较Semi Reentrant，Reentrant和Honeycomb的拉伸结果表明，Semi Reentrant的机械性能是彼此之间的组合。