This paper presents an integrated experimental and computational study of the compression behavior of individual thin-walled metallic hollow spheres (MHS) with patterned distributions of microporosity. Quasi-static compression testing, including purely elastic loading, was conducted on two groups of individual MHS with two different sizes to examine the entire deformation process as well as the purely elastic response. Three-dimensional finite element modeling was then performed to investigate the effects of different microporosity distribution patterns on the MHS compression behavior and to understand the pertinent deformation and failure mechanisms. Results show that the Young's modulus and collapse stress of individual MHS with a uniform microporosity distribution decrease nonlinearly with porosity, which follows the same power-law functions developed for the porous wall material. For other patterned (i.e., vertical, horizontal, and random) distributions of microporosity involving localized weak wall sections, buckling commences at the weak sections, generating “buckling lines”, followed by buckling failure along these adjacent or converged “buckling lines”. Moreover, among the “buckling lines” generate some hinges that contribute to the increased load-bearing capability during the densification process. These findings can shed lights on the design, manufacturing, and modeling of individual MHS and MHS-based materials with specifically tailored engineering performance.

本文介绍了具有微孔分布图案分布的单个薄壁金属空心球（MHS）压缩行为的综合实验和计算研究。对两组具有两种不同尺寸的单个MHS进行了准静态压缩测试，包括纯弹性载荷，以检查整个变形过程以及纯弹性响应。然后进行三维有限元建模，以研究不同的微孔分布模式对MHS压缩行为的影响，并了解相关的变形和破坏机制。结果表明，具有均匀微孔分布的单个MHS的杨氏模量和坍塌应力随孔隙度非线性降低，遵循与多孔壁材料相同的幂律功能。对于涉及局部薄壁部分的微孔的其他模式分布（即垂直，水平和随机）分布，屈曲从薄弱部分开始，产生“屈曲线”，然后沿着这些相邻或会聚的“屈曲线”屈曲破坏。此外，在“屈曲线”中会产生一些铰链，这些铰链有助于在致密化过程中提高承重能力。这些发现可以为具有专门定制的工程性能的单个MHS和基于MHS的材料的设计，制造和建模提供启发。屈曲从薄弱部分开始，产生“屈曲线”，然后沿着这些相邻或会聚的“屈曲线”屈曲失败。此外，在“屈曲线”中会产生一些铰链，这些铰链有助于在致密化过程中提高承重能力。这些发现可以为具有专门定制的工程性能的单个MHS和基于MHS的材料的设计，制造和建模提供启发。屈曲从薄弱部分开始，产生“屈曲线”，然后沿着这些相邻或会聚的“屈曲线”屈曲失败。此外，在“屈曲线”中会产生一些铰链，这些铰链有助于在致密化过程中提高承重能力。这些发现可以为具有专门定制的工程性能的单个MHS和基于MHS的材料的设计，制造和建模提供启发。