Abstract A new concept of 3D auxetic lattice structures with high stiffness is proposed in this paper. Correspondingly, a feasible method for rapidly fabricating the proposed structures with high-performance continuous carbon fiber reinforced polymer (CFRP) composite is exploited. Theoretical models for predicting the homogenized elastic properties of the representative structure along all principal axes, including the Young's moduli, Poisson's ratios and shear moduli, are developed. Based on the models, directional dependence of structural homogenized elastic properties is investigated in detail. The compressive elastic behaviors of the 3D auxetic lattice structures fabricated with high-performance continuous carbon fiber reinforced polymer (CFRP) composite are further investigated in a combination of numerical analysis and experiments. Our results suggest that the new concept of 3D auxetic lattice structures are very suitable for uniaxial loading and can be great candidates where excellent load-bearing capacity and obvious negative Poisson's ratio effects are simultaneously desired. Coupled with the proposed efficient fabrication process, our efforts may help to promote the 3D auxetic lattice structures to be widely used in a variety of applications.

中文翻译：

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基于拉伸主导单元的碳纤维增强复合材料3D拉胀晶格结构的新概念

摘要 本文提出了一种具有高刚度的3D拉胀晶格结构的新概念。相应地，开发了一种用高性能连续碳纤维增强聚合物（CFRP）复合材料快速制造所提出结构的可行方法。开发了用于预测沿所有主轴（包括杨氏模量、泊松比和剪切模量）的代表性结构的均匀弹性特性的理论模型。基于这些模型，详细研究了结构均质弹性特性的方向依赖性。结合数值分析和实验，进一步研究了由高性能连续碳纤维增强聚合物 (CFRP) 复合材料制成的 3D 拉胀晶格结构的压缩弹性行为。我们的结果表明，3D 拉胀晶格结构的新概念非常适合单轴加载，并且可以成为同时需要出色承载能力和明显负泊松比效应的理想选择。结合所提出的高效制造工艺，我们的努力可能有助于促进 3D 拉胀晶格结构在各种应用中的广泛应用。