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Recent Progress of Porous Materials
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Recent Progress of Porous Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: closed (20 August 2024) | Viewed by 4500

Special Issue Editor

Dr. Kuniharu Ushijima

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Tokyo University of Science, Tokyo 1258585, Japan
Interests: periodic porous structure; thin-walled structure; additive manufacturing; numerical analysis; topology optimization; 4D printing; fracture mechanics; multiphisics

Special Issue Information

Dear Colleagues,

Periodic cellular structures, such as honeycomb and lattice structures, have been widely used as lightweight sandwich cores in many kinds of mechanical components. In particular, because of the rapid development of additive manufacturing technology, more precise and more complex three-dimensional lattices with micrometer lengths can be fabricated relatively easily. Such structures are expected to be useful as novel new multi-functional metamaterials that cannot be found in natural materials.

For the past 15 years, we have been conducting research on the mechanical, vibration, sound absorption and heat transfer properties of porous structures through nonlinear numerical simulation and experimental tests. More recently, we have also analyzed the multifunctional properties of porous structures and investigated their high potential in combination with optimized design. In this Special Issue, we would like to present some interesting properties of lattice structures.

Dr. Kuniharu Ushijima
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • porous structure
  • sound absorption properties
  • mechanical stiffness
  • numerical simulation
  • additive manufacturing

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Published Papers (3 papers)

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Research

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12 pages, 5086 KiB  
Article
Impact of Regular and Irregular Pore Distributions on the Elasticity of Porous Materials: A Microstructure-Free Finite Element Study
by Prajjayini Chakma and Yunhua Luo
Materials 2024, 17(18), 4490; https://doi.org/10.3390/ma17184490 - 13 Sep 2024
Viewed by 709
Abstract
Conventional analytical formulas for predicting the effective Young’s modulus of porous materials often rely on simplifying assumptions and do not explicitly incorporate microstructural information. This study investigates the impact of regular versus irregular pore distributions on the stiffness of porous materials using microstructure-free [...] Read more.
Conventional analytical formulas for predicting the effective Young’s modulus of porous materials often rely on simplifying assumptions and do not explicitly incorporate microstructural information. This study investigates the impact of regular versus irregular pore distributions on the stiffness of porous materials using microstructure-free finite element modeling (MF-FEM). After conducting a convergence study, MF-FEM predictions were validated against experimental data and used to assess the accuracy of commonly employed analytical models. The results demonstrate that materials with irregular microstructures exhibit a rapid decrease in Young’s modulus, approaching zero at porosities slightly greater than 50%. In contrast, regular microstructures show a more gradual decline, maintaining significant stiffness until the porosity exceeds 90%. Additionally, the study reveals that some analytical formulas align better with irregular microstructures while others are more suited to regular ones, attributable to the underlying assumptions of these models. These findings underscore the necessity of considering pore distribution patterns in modeling to accurately predict the mechanical behavior of porous materials. Full article
(This article belongs to the Special Issue Recent Progress of Porous Materials)
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20 pages, 6466 KiB  
Article
Inhibited and Retarded Behavior by Ca2+ and Ca2+/OD Loading Rate on Ureolytic Bacteria in MICP Process
by Masaharu Fukue, Zbigniew Lechowicz, Yuichi Fujimori, Kentaro Emori and Catherine N. Mulligan
Materials 2023, 16(9), 3357; https://doi.org/10.3390/ma16093357 - 25 Apr 2023
Cited by 1 | Viewed by 1610
Abstract
The estimation of optical density (OD) with viable cells is challenging for engineering purposes. In this study, the OD conversion based on previous study was used. The inhibited and retarded behavior of the microbially induced carbonate precipitation (MICP) process was examined. The experimental [...] Read more.
The estimation of optical density (OD) with viable cells is challenging for engineering purposes. In this study, the OD conversion based on previous study was used. The inhibited and retarded behavior of the microbially induced carbonate precipitation (MICP) process was examined. The experimental results showed that high Ca2+ drastically influences the inhibited and retarded behavior on MICP processes. The analysis showed that the inhibition and retardation effects occurred when the Ca2+/OD loading rate exceeded 8.46 M. The critical value was equal to the proportional constant for obtaining carbonate precipitation rate (CPR) from OD. Due to this, the blending design of materials became possible, with no risk of inhibition. In conclusion, the inhibition and retardation of the MICP process are governed by the Ca2+ load and the linear standard line (LSL), which may be attributed to the capacity or tolerance of viable cells, i.e., CPR/OD = 8.46 M or Ca2+/OD = 8.46 M. Full article
(This article belongs to the Special Issue Recent Progress of Porous Materials)
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Review

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28 pages, 19697 KiB  
Review
Fabrication, Processing, Properties, and Applications of Closed-Cell Aluminum Foams: A Review
by Wensheng Fu and Yanxiang Li
Materials 2024, 17(3), 560; https://doi.org/10.3390/ma17030560 - 24 Jan 2024
Cited by 4 | Viewed by 1710
Abstract
Closed-cell aluminum foams have many excellent properties, such as low density, high specific strength, great energy absorption, good sound absorption, electromagnetic shielding, heat and flame insulation, etc. As a new kind of material, closed-cell aluminum foams have been used in lightweight structures, traffic [...] Read more.
Closed-cell aluminum foams have many excellent properties, such as low density, high specific strength, great energy absorption, good sound absorption, electromagnetic shielding, heat and flame insulation, etc. As a new kind of material, closed-cell aluminum foams have been used in lightweight structures, traffic collision protections, sound absorption walls, building decorations, and many other places. In this paper, the recent progress of closed-cell aluminum foams, on fabrication techniques, including the melt foaming method, gas injection foaming method, and powder metallurgy foaming method, and on processing techniques, including powder metallurgy foaming process, two-step foaming process, cast foaming process, gas injection foaming process, mold pressing process, and integral foaming process, are summarized. Properties and applications of closed-cell aluminum foams are discussed based on the mechanical properties and physical properties separately. Special focuses are made on the newly developed cast-forming process for complex 3D parts and the improvement of mechanical properties by the development of small pore size foam fabrication and modification of cell wall microstructures. Full article
(This article belongs to the Special Issue Recent Progress of Porous Materials)
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