Compressive properties of two-layered aluminum foams with closed-cell and open-cell structures

Hangai, Yoshihiko; Ando, Mizuki; Ohashi, Masataka; Amagai, Kenji; Suzuki, Ryosuke O.; Matsubara, Masaaki; Yoshikawa, Nobuhiro

doi:10.1016/j.mtcomm.2020.101249

Cited by 9 publications

(7 citation statements)

References 25 publications

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“…Co., Ltd.) had particle sizes of approximately 25 µm, less than 45 µm, and approximately 1 µm, respectively. The amounts of TiH 2 and Al 2 O 3 powders were 1 mass% and 5 mass%, respectively, with respect to the mass of AC4CH powder, in accordance with the work in [19]. Then, as shown in Figure 1c, the mixed powder was sintered using spark plasma sintering (SPS) equipment.…”

Section: Precursor Of Aluminum Foamsupporting

confidence: 73%

X-ray Radiography Inspection of Pores of Thin Aluminum Foam during Press Forming Immediately after Foaming

Hangai

Kawato

Ohashi

et al. 2021

Metals

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Forming aluminum foam to the desired shape while retaining its pore structures is essential for manufacturing aluminum foam products. Recently, a press forming process for aluminum foam that is performed after precursor foaming but before solidification has been proposed. In this study, to track individual pores throughout press forming immediately after foaming, X-ray radiography inspection was applied. A thin precursor was used, and foaming was constrained to the X-ray transmission direction. It was shown that, although some pores coalesced with other pores, the pores did not collapse during press forming. In addition, the porosity of aluminum foam evaluated from X-ray transmission images was constant during press forming. Some pores retained their shape during press forming but their position was changed by the material flow generated by press forming. These results show that by press forming before the solidification of aluminum foam, aluminum foam can be shaped without the collapse of pores.

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Section: Precursor Of Aluminum Foamsupporting

confidence: 73%

X-ray Radiography Inspection of Pores of Thin Aluminum Foam during Press Forming Immediately after Foaming

Hangai

Kawato

Ohashi

et al. 2021

Metals

Self Cite

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“…In recent years, based on the pore size, porosity, relative density, heat treatment, and other parameters of open-cell aluminum foam materials, many scholars have systematically analyzed the mechanical properties of aluminum foam metal under static compression, dynamic compression, and impact conditions, and investigated the damage caused by deformation, sound absorption, energy absorption, and other mechanical characteristics of aluminum foam [4][5][6][7][8][9][10]. The theoretical, experimental, and simulation research status of lightweight porous metals and their sandwich structures were analyzed and discussed under quasi-static and dynamic impact loads by Jing et al [11].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Characterization Analysis of Quasi-Static and Fatigue Compression Properties of Aluminum Foam

2023

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In order to explore the evolution of physical and mechanical properties and acoustic emission (AE) characteristics of aluminum foam under fatigue and quasi-static compression from a microscopic point of view, the AE monitoring technology was used to analyze the deformation, hardening, and energy absorption characteristics of open-cell aluminum foam under quasi-static compression at different rates (2, 10 and 50 mm/min) and fatigue loading tests with different peak stress ratios k (k = maximum stress/yield stress) by means of MTS fatigue testing machine and CCD camera. The results indicated that under different compression rates, the AE ring down count had the same trend as the engineering stress–strain response of the specimens, the AE ring down count rate at the plastic deformation stage showed the same performance as the work hardening rate, and the AE energy absorption efficiency corresponded well to the experimental results. The specimen entered the densification stage with the stability of AE count and the decrease in energy absorption efficiency. During the fatigue tests of different k values, the change trend of strain was consistent with the response of acoustic emission characteristic parameters, and the fatigue compression damage caused by the deformation process of the specimen can be monitored by the change in AE characteristics. The AE characteristics can dynamically monitor the compression process and provide a new research method and idea for the study of mechanical properties of aluminum foam.

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“…The density of open-cell MFs can be down to onethird of the density of closed-cell MFs at the same volume; however, the strength and structural stiffness of closed-cell MFs are higher. [1] Compared with the previously mentioned MFs, an increase in strength can be achieved with the creation of composite MFs (CMFs); however, their density will also be higher. [2,3] To reduce the CMFs' density, syntactic foams should be used instead of stochastic foams.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and Investigation of In Situ and Ex Situ Produced Aluminum Matrix Foam‐Filled Tubes

et al. 2021

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Composite metal foams (CMFs) are hybrid structures, which are usually produced from separate parts, and not in one step as functional, structural elements. Functional CMFs are characterized by high strength, high stiffness, and extreme energy absorbing properties compared with conventional metallic foams, which allow them to be used as load‐bearing and energy absorbing elements. Test specimens are made in AlMgSi0.5 tubes with the wall thickness of 5 mm. AlSi12 casting alloy is used as matrix material. To ensure the foam structure porosity, lightweight expanded clay aggregate particles (LECAPs) are used with unimodal and bimodal size distribution. The results show that low‐cost unimodal and bimodal foam‐filled tubes (FFTs) can be produced in situ by inert gas pressure infiltration. Besides their low density, these CMFs achieve high strength, high toughness, and special, functional properties compared with simple metallic foams. After heat treatment, in situ produced bimodal FFTs have the highest energy absorption capacity of an average of 67.2 J cm−3, which is 9% higher than the average value of the ex situ FFTs. Therefore, it is advantageous to produce in situ FFTs, because with proper manufacturing, it requires less machining, making the production easier, while achieving better compressive properties.

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Compressive properties of two-layered aluminum foams with closed-cell and open-cell structures

Cited by 9 publications

References 25 publications

X-ray Radiography Inspection of Pores of Thin Aluminum Foam during Press Forming Immediately after Foaming

X-ray Radiography Inspection of Pores of Thin Aluminum Foam during Press Forming Immediately after Foaming

Acoustic Emission Characterization Analysis of Quasi-Static and Fatigue Compression Properties of Aluminum Foam

Manufacturing and Investigation of In Situ and Ex Situ Produced Aluminum Matrix Foam‐Filled Tubes

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