Metamaterials that exhibit negative Poisson’s ratio (NPR) are known as auxetics. They laterally expand or contract when they are axially tensioned or compressed. A re–entrant chiral auxetic structure (RCA) is a recently developed structure, which combines the topological features of re–entrant and chiral honeycombs. Comparative study between the RCA structure and popular benchmarks subjected to uniaxial compression has been conducted experimentally and numerically. Specimens have been fabricated from polyamide12 (PA12) using Multi Jet Fusion (MJF). Numerical models have been developed using ABAQUS/Explicit and verified by the experiments. The experimental measurements manifest the high accuracy of the MJF process to produce robust components with precise details. It has been found that the RCA structure outperforms the other types of honeycombs in terms of strength and specific energy absorption when loaded in the Y direction, while only the tetrachiral honeycomb surpasses the RCA structure in terms of specific energy absorption when loaded in the X direction. The auxeticity (NPR) of the RCA structure compressed in the Y direction was larger than that of the other honeycombs. Numerical models have been employed to study the effects of friction and the number of cells on the mechanical response of the RCA structure.

表现出负泊松比（NPR）的超材料被称为膨胀。当它们被轴向拉紧或压缩时，它们在横向上膨胀或收缩。凹角手性膨胀结构（RCA）是最近开发的结构，结合了凹角和手性蜂窝的拓扑特征。已经通过实验和数值方法对RCA结构和受到单轴压缩的常用基准进行了比较研究。使用Multi Jet Fusion（MJF）由聚酰胺12（PA12）制成样品。使用ABAQUS / Explicit开发了数值模型，并通过实验进行了验证。实验测量表明，MJF工艺具有很高的精度，可以生产出具有精确细节的坚固组件。已经发现，当沿Y方向加载时，RCA结构在强度和比能量吸收方面优于其他类型的蜂窝，而当沿X方向加载时，仅四手蜂蜂窝在强度和比能量吸收方面优于RCA结构。 。沿Y方向压缩的RCA结构的膨胀性（NPR）大于其他蜂窝。数值模型已被用来研究摩擦和孔数对RCA结构力学响应的影响。沿Y方向压缩的RCA结构的膨胀性（NPR）大于其他蜂窝。数值模型已被用来研究摩擦和孔数对RCA结构力学响应的影响。沿Y方向压缩的RCA结构的膨胀性（NPR）大于其他蜂窝。数值模型已被用来研究摩擦和孔数对RCA结构力学响应的影响。