Abstract
Micropores play critical roles in both natural and man-made materials. Such pores take on a variety of shapes and sizes ranging from spherical to irregular sphere-like voids with diameters spanning from the nanometer to millimeter scales. When porous structures are mechanically loaded, the pores direct the stress around their free surfaces, altering the material’s mechanical response relative to fully dense materials. In this study, for the first time, we create micro-architected porous samples using nanolithography and investigate the role of pore morphology by conducting a series of in situ micropillar compression tests in scanning electron microscopy. The findings demonstrate that porosity is the primary factor influencing the mechanical response of these micro-architected materials, as often seen on a macroscopic level. Additionally, we observed that pore geometry had a significant impact on Young’s modulus, yield stress, and strain energy density as a secondary parameter. Then, the extracted Young’s modulus was compared to macroscopic empirical models and determined the analytical models sufficiently described the impact of porosity in the microscopic scale but failed to capture the impact of second-order parameters. These results suggest how porous materials can be tailored to achieve desired mechanical properties based on the engineering applications of interest.
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Acknowledgements
This work was partially supported as part of the Multi-Scale Fluid?Solid Interactions in Architected and Natural Materials (MUSE) Project, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award #DESC0019285. Specifically, MUSE supported the experimental work performed by Seo Young Ahn. The authors would like to thank Dr. Matthew Dickerson from the Air Force Research Lab for his assistance in conducting the preliminary studies leading up to this research. The authors would also like to thank the University of Utah NanoFab facility for their training and assistance with the experiments.
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SA—Formal Analysis, Writing—Original Draft, Data Curation, Visualization, Writing—Review & Editing; YW—Formal Analysis, Writing—Review & Editing; BV—Formal Analysis, Visualization, Writing & Editing; RW—Formal Analysis, Investigation, Methodology, Supervision, Writing—Review & Editing; PN—Project Administration, Conceptualization, Supervision, Writing—Review & Editing. All authors reviewed the results and approved the final version of the manuscript.
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Ahn, S.Y., Wang, Y., Vazic, B. et al. Probing the Mechanical Performance of Micro-architected Porous Structures Through In Situ Characterization and Analysis. JOM 75, 4361–4375 (2023). https://doi.org/10.1007/s11837-023-06061-5
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DOI: https://doi.org/10.1007/s11837-023-06061-5