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Title: Probing the Mechanical Performance of Micro-architected Porous Structures Through In Situ Characterization and Analysis

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. Furthermore, these results suggest how porous materials can be tailored to achieve desired mechanical properties based on the engineering applications of interest.

Authors:
 [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. University of Utah, Salt Lake City, UT (United States)
  2. MicroTesting Solutions LLC, Hiliard, OH (United States)
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
2204477
Grant/Contract Number:  
SC0019285
Resource Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 75; Journal Issue: 10; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Microscale; additive manufacturing; nanoscribe; 3D printing; micro-porous materials

Citation Formats

Ahn, Seo Young, Wang, Yanbo, Vazic, Bozo, Wheeler, Robert, and Newell, Pania. Probing the Mechanical Performance of Micro-architected Porous Structures Through In Situ Characterization and Analysis. United States: N. p., 2023. Web. doi:10.1007/s11837-023-06061-5.
Ahn, Seo Young, Wang, Yanbo, Vazic, Bozo, Wheeler, Robert, & Newell, Pania. Probing the Mechanical Performance of Micro-architected Porous Structures Through In Situ Characterization and Analysis. United States. https://doi.org/10.1007/s11837-023-06061-5
Ahn, Seo Young, Wang, Yanbo, Vazic, Bozo, Wheeler, Robert, and Newell, Pania. Wed . "Probing the Mechanical Performance of Micro-architected Porous Structures Through In Situ Characterization and Analysis". United States. https://doi.org/10.1007/s11837-023-06061-5.
@article{osti_2204477,
title = {Probing the Mechanical Performance of Micro-architected Porous Structures Through In Situ Characterization and Analysis},
author = {Ahn, Seo Young and Wang, Yanbo and Vazic, Bozo and Wheeler, Robert and Newell, Pania},
abstractNote = {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. Furthermore, these results suggest how porous materials can be tailored to achieve desired mechanical properties based on the engineering applications of interest.},
doi = {10.1007/s11837-023-06061-5},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 10,
volume = 75,
place = {United States},
year = {Wed Aug 23 00:00:00 EDT 2023},
month = {Wed Aug 23 00:00:00 EDT 2023}
}

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