scholarly journals Metal Foam Analysis Based on CT Layers

2018 ◽  
Vol 1 (1) ◽  
pp. 57-60
Author(s):  
Tamás Antal Varga ◽  
Tamás Mankovits
Keyword(s):  
Metal Foam ◽  
Foam Cells ◽  
Metal Foams ◽  
Aluminium Foam ◽  
Geometrical Modelling ◽  
Foam Model ◽  
Closed Cell

Abstract The geometrical modelling of metal foams remains one of the greatest challenges facing researchers in the field. In this paper the analysis of the inner structure of closed-cell aluminium foam - an essential part of the construction of an idealized foam model - is presented. With the application of special purpose software the properties of the foam cells can be mapped precisely and the results applied to the development of idealized foam geometry constructed in CAD applications.

Structural analysis and its statistical evaluation of a closed-cell metal foam

2014 ◽  
Vol 5 (2) ◽  
pp. 135-143 ◽  
Author(s):  
T. Mankovits ◽  
I. Budai ◽  
G. Balogh ◽  
A. Gábora ◽  
I. Kozma ◽  
...  
Keyword(s):  
Finite Element ◽  
Metal Foam ◽  
Complex Geometry ◽  
Structural Information ◽  
Metal Foams ◽  
Element Analysis ◽  
Widespread Application ◽  
3D Cad ◽  
Analysis Process ◽  
Closed Cell

The development of an efficient procedure for 3d modeling and finite element simulation of metal foams is one of the greatest challenges for engineer researchers nowadays. Creating 3d CAD model is alone a demanding engineering task due to its extremely complex geometry, and the proper finite element analysis process is still in the center of the research. The increasingly widespread application of the metal foams, e.g. in vehicle and medical industry, requires this knowledge in the design phase. A closed-cell metal foam is studied using different analyzing methods where the aim is to collect information about the composition and geometry (structure) that is satisfactory for the later research. Using statistical methods microscopic, X-ray and surface analyzing studies on the specimens produced according to the concerning standard are evaluated. The main goal of this part of the project is to obtain structural information and to determine the homogeneity or the in-homogeneity property of the metal foam specimens taken from different locations.

scholarly journals SEMI–AUTOMATED ASSESSMENT OF MICROMECHANICAL PROPERTIES OF THE METAL FOAMS ON THE CELL-WALL LEVEL

2016 ◽  
Vol 7 ◽  
pp. 72
Author(s):  
Nela Krčmářová ◽  
Jan Šleichrt ◽  
Tomáš Doktor ◽  
Daniel Kytýř ◽  
Ondřej Jiroušek
Keyword(s):  
Cell Wall ◽  
Vickers Hardness ◽  
Metal Foam ◽  
Filter Material ◽  
Deformation Energy ◽  
Metal Foams ◽  
Aluminium Foam ◽  
Plastic Properties ◽  
Wide Range ◽  
Two Samples

Metal foams are innovative porous material used for wide range of application such as deformation energy or sound absorption, filter material, or microbiological incubation carrier. To predict mechanical properties of the metal foam is necessary to precisely describe elasto–plastic properties of the foam on cell–wall level. Indentation with low load is suitable tool for this purpose. In this paper custom designed instrumented microindentation device was used for measurement of cell-wall characteristics of two different aluminium foams (ALPORAS and ALCORAS). To demonstrate the possibility of automated statistical estimation of measured characteristics the device had been enhanced by semi-automatic indent positioning and evaluation procedures based on user-defined grid. Vickers hardness was measured on two samples made from ALPORAS aluminium foam and one sample from ALCORAS aluminium foam. Average Vickers hardness of ALPORAS foam was 24.465HV1.019 and average Vickers hardness of ALCORAS was 36.585HV1.019.

Microstructure and mechanical properties of ALPORAS closed-cell aluminium foam

2015 ◽  
Vol 107 ◽  
pp. 228-238 ◽  
Author(s):  
Wen-Yea Jang ◽  
Wen-Yen Hsieh ◽  
Ching-Chien Miao ◽  
Yu-Chang Yen
Keyword(s):  
Mechanical Properties ◽  
Aluminium Foam ◽  
Microstructure And Mechanical Properties ◽  
Closed Cell

The Fracture Properties of Sandwich Structures Based on a Metal Foam Core

2014 ◽  
Vol 936 ◽  
pp. 2054-2062
Author(s):  
Yiou Shen ◽  
Yan Li ◽  
Wesley Cantwell ◽  
Yu Yuan Zhao
Keyword(s):  
Metal Foam ◽  
Sandwich Structures ◽  
Compaction Pressure ◽  
Metal Foams ◽  
Compression Tests ◽  
Fracture Properties ◽  
Indentation Tests ◽  
Point Bend ◽  
Average Size ◽  
Two Parameters

The fracture properties of a series of metal foam sandwich structures based on glass fiber-reinforced polyamide 6,6 composite (GF/PA6,6) skins have been investigated. The open cell core materials were manufactured using the Lost Carbonate Sintering (LCS) process, a recently-developed technique for manufacturing metal foams. Initially, the effect of varying the compaction pressure used in producing the metal foams as well as the density of the samples were investigated through a series of compression tests. Here, it was shown that the compressive strength and the elastic modulus of the foams varied with density and compaction pressure, in spite of the fact that the average size of the cells in these foams were insensitive to either of these two parameters. The resistance of sandwich structures to localized loading was investigated through a series of indentation tests. Here, it was shown that the indentation response of sandwich structures could be characterized using a simple indentation law, the parameters of which did not exhibit any clear dependency on the density of the foam. Finally, three point bend tests on the sandwich structures have shown that their loading-bearing properties were sensitive to foam density.

Thermal Dispersion in Metal Foams

2011 ◽  
Author(s):  
Teresa B. Hoberg ◽  
Kenshiro Muramatsu ◽  
Erica M. Cherry ◽  
John K. Eaton
Keyword(s):  
Heat Transfer ◽  
Molecular Diffusion ◽  
Metal Foam ◽  
Heated Surface ◽  
High Surface ◽  
Metal Foams ◽  
Thermal Engineering ◽  
Transfer Model ◽  
Thermal Dispersion ◽  
Transverse Mixing

Open-cell metal foams are of interest for a variety of thermal engineering applications because of their high surface-to-volume ratio and high convective heat transfer coefficients relative to conventional fins. The tortuous flow path through the foam promotes rapid transverse mixing, a fact that is important in heat exchanger applications. Transverse mixing acts to spread heat away from a heated surface, bringing cooler fluid to the foam elements that are in direct contact with the surface. Heat is also spread by conduction in the foam ligaments. The present work addresses fully-coupled thermal dispersion in a metal foam. Dispersion of the thermal wake of a line source was measured. A conjugate heat transfer model was developed which showed good agreement with the data. The validated model was used to examine the complementary effects of the mechanical dispersion, molecular diffusion in the gas, and conduction in the solid.

The Impact of Composition and Sintering Temperature for Stainless Steel Foams (SS316L) Fabricated by Space Holder Method with Urea as Space Holder

2017 ◽  
Vol 888 ◽  
pp. 413-417 ◽  
Author(s):  
Zulaikha Abdullah ◽  
Sufizar Ahmad ◽  
Musfirah Ramli
Keyword(s):  
Stainless Steel ◽  
Biomedical Application ◽  
Metal Foams ◽  
Morphological Properties ◽  
Solid Matrix ◽  
Morphological Observation ◽  
Second Phase ◽  
Space Holder ◽  
Closed Cell ◽  
The Impact

Metal foams are a cellular structure that has a solid matrix made of metal and has pores in their structure. Metal foams offer excellent combination of properties which led researchers interested in investigation in recent years. Closed-cell stainless steel (SS316L) foams for biomedical application were prepared by space holder method and the physical and morphological properties of SS316L foams were studied. Stainless steel (SS316L) powders as metallic material, polyethylene glycol (PEG) as a binder and Urea as a space holder material were mixed homogenously to avoid the particle wrecked. This mixture was compacted using uniaxial pressing machine and pressurized to 8 tons to formed the green body. By using tube furnace, the SS316L foams was two-stage sintered, the first phase at 600°C for 2 hours to decompose the urea, and the second phase at 1000°C, 1100°C, and 1200°C respectively to sinter the steel. The porosity and density test was carried out by applying Archimedean principles, while morphological observation was done by using Field Emission Scanning Electron (FESEM). The samples with 40wt.% SS316L composition and sintered at temperature of 1100°C, leads to porosities of about 44.539% and show the potential as the best metal foams.

Experimental and numerical thermal analysis of open-cell metal foams developed through a topological optimization and 3D printing process

2018 ◽  
Vol 83 (1) ◽  
pp. 10904 ◽  
Author(s):  
Abdelatif Merabtine ◽  
Nicolas Gardan ◽  
Julien Gardan ◽  
Houssem Badreddine ◽  
Chuan Zhang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
3D Printing ◽  
Numerical Simulations ◽  
Lattice Model ◽  
Metal Foam ◽  
Complex Geometry ◽  
Metal Foams ◽  
Topological Optimization ◽  
Plaster Mold ◽  
Open Cell

This study focuses on the thermal analysis and comparing a lattice model and an optimized model of open-cell metal foams manufactured thanks to a metal casting process. The topological optimization defines the complex geometry through thermal criteria and a plaster mold reproduces it in 3D printing to be used in casting. The study of the thermal behavior conducted on the two open foam metal structures is performed based on several measurements, as well as numerical simulations. It is observed that the optimized metal foam presented less and non-homogenous local temperature than the lattice model with the gap of about 10 °C between both models. The pore size and porosity significantly affect the heat transfer through the metal foam. The comparison between numerical simulations and experimental results regarding the temperature fields shows a good agreement allowing the validation of the developed three-dimensional model based on the finite element method.

scholarly journals Irreversible Thermal Expansion of Replicated Aluminium Foam

2018 ◽  
Vol 24 (2) ◽  
pp. 156
Author(s):  
Arkady Finkelstein ◽  
Dmitry Husnullin
Keyword(s):  
Thermal Expansion ◽  
Oxide Film ◽  
Thermal Cycling ◽  
Metal Foam ◽  
Porous Metal ◽  
Extraction Process ◽  
Aluminium Foam ◽  
Expansion Process ◽  
Porous Part

There was found irreversible thermal expansion of large items made of the replicated aluminium foam during the extraction of soluble filler from Al-NaCl composite. Sources of the phenomena were investigated. The expansion is discovered to be caused by incomplete contraction of the porous metal due to oxidation of its internal porous surface during thermal cycling with air and water presence. Significant role of oxide film defects in the expansion process was exposed. There was gained information on dependencies of the irreversible thermal expansion on temperature of the extraction process and metal foam pore size. Measurements of the expansion dynamics showed its finite character. It was also noted that the expansion is limited by the thermal expansion coefficient of used alloy. Finally correction coefficients were obtained that, being applied to nominal sizes of a porous part, compensates the expansion.

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