Herein, the deformation and properties of cellular structures of missing‐rib (MR) model and mixed structures (MSs) are studied experimentally and numerically. Samples with different beam angles and lattice patterns 3D printed with thermoplastic elastomer (TPE) are tested in uniaxial compression. Parametric finite‐element models are developed and used to simulate structures of different sample dimensions and lattice patterns with a particular focus on beam–wall contacts. Structures with different sizes and aspect ratios, beam angles, and lattice patterns are comparatively studied. The numerical results show a good agreement with the experimental data on samples of various sizes/patterns. The main deformation modes and key stages of the corner edge–wall contact and structure deformation are presented, and the key mechanism is analyzed. Poisson's ratio and stability of the auxeticity of different structures are established. The link between the structural and auxeticity stabilities and the characteristic of the corner edge–wall contact in MR and MSs are discussed. The MSs with alternative MR columns at opposite orientations show a better shape stability and higher critical strain for a stable auxeticity.

中文翻译：

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缺失肋骨及混合结构受压变形的数值与实验研究

本文通过实验和数值研究了缺失肋骨（MR）模型和混合结构（MS）的孔结构的变形和性质。在单轴压缩下测试具有不同束角和3D打印热塑性弹性体（TPE）的晶格图案的样品。参数化有限元模型得到开发，并用于模拟不同样本尺寸和晶格图案的结构，尤其侧重于梁壁接触。对具有不同尺寸和纵横比，光束角和晶格图案的结构进行了比较研究。数值结果与各种尺寸/图案的样品的实验数据吻合良好。给出了边角与墙体接触和结构变形的主要变形方式和关键阶段，并分析了其关键机理。泊松 确定了不同结构的膨胀比和稳定性。讨论了结构和膨胀稳定性与MR和MS中角边-壁接触特性之间的联系。在相反方向上带有替代MR柱的MS表现出更好的形状稳定性和更高的临界应变，从而具有稳定的膨胀性。