This paper presents a stiffening method by which new inclined walls are added to the classical re-entrant honeycomb cell. This modification boosts the in-plane rigidity of the re-entrant cell without significant loss from auxetic behaviour. This study focuses on the in-plane elasticity moduli and negative Poisson's ratios along the principal axes. Analytical expressions that calculate the elasticity moduli and negative Poisson's ratios are derived; both finite element modelling and experiments reported in the literature validate the expressions of this work. Further, the variation in the in-plane elastic properties of the core cell is examined by altering the new wall's geometric, sectional, and material parameters. The results from the analytical expressions and the finite element models match very closely and demonstrate the boosted rigidity of the cell proposed in this work. This work also provides a benchmark of the new cell against the classical cell that can be used to tailor the in-plane elasticity moduli and negative Poisson's ratios to suit the needs of different applications.

本文提出了一种加固方法，通过该方法将新的倾斜壁添加到经典的凹腔蜂窝单元中。这种修饰提高了折返细胞的面内刚度，而没有明显的血流动力学行为损失。这项研究的重点是沿主轴的平面内弹性模量和负泊松比。推导了计算弹性模量和负泊松比的解析表达式。文献报道的有限元建模和实验都验证了这项工作的表述。此外，通过改变新壁的几何，截面和材料参数，可以检查核心单元的面内弹性特性的变化。解析表达式和有限元模型的结果非常吻合，证明了这项工作中提出的单元刚度提高。这项工作还提供了新电池相对于经典电池的基准，可用于调整面内弹性模量和负泊松比，以适应不同应用的需求。