Abstract The compressive mechanical properties of open-cell hollow-sphere structures were experimentally and numerically investigated. The geometric model of the structure, through which the connected regions between spheres were perforated, was derived from the traditional metallic hollow-sphere structure (MHSS). For the experimental study, 3D printing technology was used to fabricate structures made of nylon in different arrangements, such as simple cubic (SC), body-centred cubic (BCC) and face-centred cubic (FCC). The experimental results validated the effectiveness of the finite element models for structures arranged in different packing patterns. Based on numerical simulations, parametric studies were conducted to investigate the influences of the geometrical and material parameters on the basic mechanical properties of the structure, including the elastic modulus, Poisson's ratio and initial yield stress. The results confirmed the significant impact of the structure's relative densities, which depend on the different geometrical parameters, such as the spheres’ spatial pattern, wall thickness and connection radius, on the mechanical properties of the structure. Additionally, the influence of the material parameters, such as Young's modulus and the yield stress, on the mechanical properties were also detected and validated.

中文翻译：

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开孔空心球结构压缩力学性能的研究

摘要 对开孔空心球结构的压缩力学性能进行了实验和数值研究。该结构的几何模型是从传统的金属空心球结构（MHSS）衍生而来的，球体之间的连接区域通过该模型被穿孔。在实验研究中，3D 打印技术用于制造不同排列的尼龙结构，如简单立方 (SC)、体心立方 (BCC) 和面心立方 (FCC)。实验结果验证了有限元模型对于以不同填充模式排列的结构的有效性。在数值模拟的基础上，进行了参数研究，研究了几何和材料参数对结构基本力学性能的影响，包括弹性模量、泊松比和初始屈服应力。结果证实了结构的相对密度对结构力学性能的显着影响，其取决于不同的几何参数，如球体的空间图案、壁厚和连接半径。此外，还检测并验证了材料参数（例如杨氏模量和屈服应力）对机械性能的影响。