Microstructure and mechanical properties of ALPORAS closed-cell aluminium foam

Jang, Wen-Yea; Hsieh, Wen Yen; Miao, Ching Chien; Yen, Yu Chang

doi:10.1016/j.matchar.2015.07.012

Cited by 75 publications

(47 citation statements)

References 28 publications

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“…The area under the stress-strain curve corresponds to the energy that aluminum foams can absorb. Because the stress remains almost constant with increasing strain in the plateau stage, aluminum foams can absorb a lot of energy in the deformation process [4][5][6][7]. In the case of closed-cell aluminum foams, the entrapped gas inside the cells also plays an important role in the dynamic compression, which extends their application in impact and explosion-proof domains [8,9].…”

Section: Introductionmentioning

confidence: 99%

Compressive performance and deformation mechanism of the dynamic gas injection aluminum foams

Wang

Maire

Chen

et al. 2019

Materials Characterization

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The dynamic gas injection method with high-speed horizontal oscillation could reduce the cell size and improve the cell quality of aluminum foams, so it is of interest to study the compressive performance and deformation mechanism of the foams produced with this process. In-situ compression in X-ray tomography was used for this research. Results have shown that the plateau stresses of bulk aluminum foams prepared by the dynamic gas injection method are in the range of 0.3 ~ 11 MPa. When the cell size is reduced to around 1 mm, the plateau stress could reach 22 MPa. In addition, the brittle deformation characteristics of aluminum foams in the quasi-static compression process are obvious. The dynamic gas injection method could greatly improve the mechanical properties of aluminum foams, and aluminum foams prepared by this method have a better compressive performance compared to that prepared by static method even at the same relative density. The uniformity of the cell size and sphericity also affects the mechanical properties. The result of in-situ compression shows that there are two main failure modes for cell walls of aluminum foams: the fracture after buckles of the cell walls and the direct fracture of the cell walls. The aluminum foams prepared by the dynamic gas injection method could have a wide application prospect due to its superior compressive performance.

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Section: Introductionmentioning

confidence: 99%

Compressive performance and deformation mechanism of the dynamic gas injection aluminum foams

Wang

Maire

Chen

et al. 2019

Materials Characterization

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“…The main steps of the global procedure to produce both the 3D and shell closed cell metallic foam finite element models are illustrated in Fig 16. The characterization of relevant morphological indicators of closed cell metallic foams was given in a previous effort [31], showing that different randomly generated microstructures yield similar results when the same set of morphological indicators is used. The foam RVEs and the set of morphological indicators used in the present contribution are based on a significant body of literature presenting experimental evidence about ALPORAS foams, see for instance [8,37,10].…”

Section: Finite Element Modelingmentioning

confidence: 99%

“…using the explicit solver of ABAQUS. In this simulation no periodicity is applied to mimic the experimental boundary conditions from [8]. The models were sandwiched between two parallel rigid plates, with the other four (lateral) faces of the specimen left free in the simulation.…”

Section: Finite Element Modelingmentioning

confidence: 99%

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Efficient computational modelling of closed cell metallic foams using a morphologically controlled shell geometry

Ghazi

Tiago

Sonon

et al. 2020

International Journal of Mechanical Sciences

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This contribution addresses the finite element modelling of closed cell metallic foams using Representative Volume Elements (RVEs) based on shell geometries directly extracted from implicitly defined 3D geometries. 3D RVEs of closed cell foam materials are produced by means of a generation strategy allowing a close morphological control reproducing fine scale geometrical features incorporating cell size, cell wall thickness and cell wall curvature distributions. The strategy is built on three computational ingredients: (i) a random packing algorithm based on random sequential addition assisted by neighbour distance control, (ii) a distance field-based shape tessellation (morphing) that allows incorporating cell wall curvatures and varying cell wall thicknesses and (iii) a close control on the shape of the cells. In order to decrease the computational cost of a full 3D finite element model, an original approach is proposed to produce a shell-based geometry directly from 3D information. Extracting the shell geometry from the implicitly defined 3D geometry based on the zero level of distance fields that would represent the cell walls is computationally impossible. Therefore, a novel robust procedure is proposed using careful cutting operations on distance fields for this purpose. The effect of the different microstructural geometrical features of interest on the average mechanical behaviour of the foam is investigated using shell-based finite element analyses. The computational cost and the accuracy of the proposed shell models are then assessed by comparing their results to full 3D simulations. The macroscopic behaviour of the generated shell-based model under compressive loading is then assessed up to the densification stage (including contact), and compared qualitatively with experiments from the literature. The macroscopic behaviour of the shell-based model is explained by linking it to cell/wall level deformation mechanisms.

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“…10,11) Various raw materials of aluminum foams have been focused on in recent years, such as pure aluminum, Al-Si alloy, Al-Mg alloy and so on. [12][13][14][15][16][17][18] However, reports on 6063 aluminum foams fabricated by melt foaming method are few. Liu, etc.…”

Section: Instructionmentioning

confidence: 99%

Foaming Process and Properties of 6063 Aluminum Foams by Melt Foaming Method

et al. 2017

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Aluminum foams made by 6063 aluminum alloy have been prepared by melt foaming method. The uniformity of foam pores is much concerned for that homogeneous pores attribute to excellent properties. It is mainly up to the stirring intensity when adding the blowing agent into the melt, and the cooling rate of the liquid foams. In this paper, 6063 aluminum foams have been fabricated by different stirring times of TiH 2 at different cooling conditions. Microstructure, cell size uniformity and compressive property of the foams have been studied. The melt which mechanically stirred for 6 minutes before foaming and the foam cooled in the air show homogenous pore structure and good mechanical property. The use of 6063 aluminum alloy offers a new raw material to prepare foams with a uniform cell size distribution as well as good mechanical property. InstructionAluminum foam, which was proposed by De Meller for the rst time in the year of 1925, is a kind of cellular material combined with aluminum or its alloys and pores.1,2) The unique structure of aluminum foams brings about a series of superior properties, such as lightweight, high energy absorption capacity, high sound absorption capacity, re resistant property, good electromagnetic shielding property and so on.3-6) Aluminum foams therefore have great application potential in aviation, aerospace, building industry and automobile industry.7-9) Among numerous manufacturing technologies, melt foaming method, also named as Alporas route, is widely adopted at the advantages of its simple fabrication process and industrialized mass production. 10,11) Various raw materials of aluminum foams have been focused on in recent years, such as pure aluminum, Al-Si alloy, Al-Mg alloy and so on.12-18) However, reports on 6063 aluminum foams fabricated by melt foaming method are few. Liu, etc. have examined the impact behavior, deformation mode and energy absorption ability during axial crushing of 6063 aluminum foams, which showed that the dynamic impact contained two steps: initial compression and gradual crushing, and specimens deformed in V -shape or inverted Vshape mode among different density values.19) B.Y. Hur pointed out that porosity and pore size were uniformly distributed with the decreasing in foaming temperature of 6063 aluminum foam. 20) There are some advantages for using 6063 aluminum alloy as raw materials. Firstly, reducing the surface tension of the melt by adding Mg can reduce the interfacial energy between pores and melt, so that pores are stabilized not to combine together and pore diameter is decreased. 21)But too low the surface tension will reduce the melt s stability and incur collapse.22) The amount of Mg (0.45-0.9 mass%) element in 6063 alloy is just appropriate to reduce the surface tension a little. Secondly, liquidus temperature of raw materials applied in melt foaming method should meet the rapid decomposition temperature of the blowing agent. On one hand, the decomposition of blowing agent is speeding up with the raising temperature, so that a higher foa...

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Microstructure and mechanical properties of ALPORAS closed-cell aluminium foam

Cited by 75 publications

References 28 publications

Compressive performance and deformation mechanism of the dynamic gas injection aluminum foams

Compressive performance and deformation mechanism of the dynamic gas injection aluminum foams

Efficient computational modelling of closed cell metallic foams using a morphologically controlled shell geometry

Foaming Process and Properties of 6063 Aluminum Foams by Melt Foaming Method

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