Drop weight impact behavior of functionally graded aluminum foam consisting of A1050 and A6061 aluminum alloys

Hangai, Yoshihiko; Kubota, Naoyuki; Utsunomiya, Takao; Kawashima, Hisanobu; Kuwazuru, Osamu; Yoshikawa, Nobuhiro

doi:10.1016/j.msea.2015.05.007

Cited by 48 publications

(27 citation statements)

References 19 publications

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“…8 and 9 indicate the initial boundary between the two foam layers in the A6061/A1050 and ADC12/A1050 FG Al foam specimens. The deformation states for all the uniform Al foam specimens and FG Al foam specimens were similar to those in previously reported impact tests (Hangai et al, 2015) and static compression tests (Utsunomiya et al, 2010b. That is, the FG Al foam specimen first started to deform only in the weaker Al (A1050) foam layer and then deformed in the high-strength Al (A6061 or ADC12) foam layer.…”

Section: Fracture States Of Specimenssupporting

confidence: 83%

“…The simple estimation method for the plateau stress was applied to estimate the plateau stresses for the uniform Al foams and each layer of the FG Al foams. Similar uniform and FG Al foams to those fabricated in this study have already been fabricated in previous studies , Hangai et al, 2015; therefore, the results obtained in the previous studies are also contained in the estimation carried out in this study. Through the comparison of the compression test results with the estimated results, the possibility of estimating plateau stresses by the simple estimation method is discussed for the uniform Al foams and each layer of the FG Al foams.…”

Section: Plateau Stress Estimation Of Impact Compression Test On Alumsupporting

confidence: 75%

“…That is, the FG Al foam specimen first started to deform only in the weaker Al (A1050) foam layer and then deformed in the high-strength Al (A6061 or ADC12) foam layer. Also, as discussed in the previous studies (Hangai et al, 2015, it can be considered that substantial deformation started from the weaker layer with higher porosity and proceeded layer by layer in the uniform Al foam specimens and in each foam layer of the FG Al foam specimens. Moreover, during the static and impact compression tests on the A6061 and A1050 uniform Al foam specimens and the A6061/A1050 and ADC12/1050 FG Al foam specimens, the dropping and scattering of collapsed small fragments were hardly observed because ductile deformation occurred.…”

Section: Fracture States Of Specimensmentioning

confidence: 75%

“…Moreover, to consider the applications of uniform and FG Al foams as shock absorbers of vehicles, the compressive behaviors of these foams have been studied through static and impact compression tests (Utsunomiya et al, 2010b, Hangai et al, 2015. As a characteristic of the compression stress-strain curve obtained by a compression test on Al foam, a plateau region with an approximately constant stress up to a large strain appears.…”

Section: Plateau Stress Estimation Of Impact Compression Test On Alummentioning

confidence: 99%

“…2 shows the uniform A6061 Al foam specimen. Figure 3 shows a schematic illustration of the process of fabricating an FG Al foam precursor (Hangai et al, 2012a, Hangai et al, 2015, Utsunomiya et al, 2010b. As shown in Figs.…”

Section: Fabrication Of Al Foams and Compression Test Specimens 21 Umentioning

confidence: 99%

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Plateau stress estimation of impact compression test on aluminum foam using X-ray computed tomography observation

Utsunomiya

Hangai

Kubota

et al. 2016

Mechanical Engineering Journal

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The plateau stress of aluminum (Al) foam is an important mechanical parameter that is closely related to its energy absorptivity. An estimation method for plateau stress was proposed by simply assuming that when the mean true compressive stress on a maximum-porosity cross section perpendicular to the direction of compressive loading reaches the critical value, the nominal compressive stress becomes equal to the plateau stress. In this study, using commercial-purity A1050 Al, A6061 Al alloy and ADC12 Al alloy die castings containing a large amount of gases, uniform Al foam and two types of functionally graded (FG) Al foam were fabricated by the friction stir welding (FSW) route precursor process. The local porosity distributions for the fabricated Al foams were obtained from the observation of X-ray computed tomography (CT) images, then drop weight impact tests were carried out to evaluate the plateau stresses. Through the comparison of the test results with the results obtained by the estimation method, the applicability of the estimation method for plateau stress to impact compression tests on uniform aluminum Al foam and each foam layer of FG Al foam was examined. It was shown that the plateau stresses can be evaluated approximately within ±20% error when the proof stress is employed as the critical value.

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Section: Fracture States Of Specimenssupporting

confidence: 83%

Section: Plateau Stress Estimation Of Impact Compression Test On Alumsupporting

confidence: 75%

Section: Fracture States Of Specimensmentioning

confidence: 75%

Section: Plateau Stress Estimation Of Impact Compression Test On Alummentioning

confidence: 99%

Section: Fabrication Of Al Foams and Compression Test Specimens 21 Umentioning

confidence: 99%

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Plateau stress estimation of impact compression test on aluminum foam using X-ray computed tomography observation

Utsunomiya

Hangai

Kubota

et al. 2016

Mechanical Engineering Journal

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Investigation of Strain‐Rate Effects in Ni/PU Hybrid Foams under Low‐Impact Velocities

et al. 2020

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Metal foams are often used as energy absorbers and lightweight materials. Inspired by a natural blueprint, open‐cell metal foams can significantly reduce the mass of a structure. The innovative manufacturing process of electrodeposition provides the possibility to customize the coating layer thickness of nickel (Ni) on a polyurethane (PU) precursor foam. Consequently, the mechanical properties can be adjusted according to the requirements of the expected application. Herein, quasistatic compression tests and low‐velocity impact tests are conducted on open‐cell Ni/PU hybrid foams to investigate the strain‐rate effects for strain rates in the range of 10−3 to 550 s−1. Furthermore, digital image correlation is performed with the intention of comparing the micromechanical deformation mechanisms under quasistatic loading with those under dynamic loading. For the first time, the heat evolution at different impact velocities of metal foams has been investigated with an infrared camera.

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Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

et al. 2021

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Cellular solids have gained extensive popularity in different areas of engineering due to their unique physical and mechanical properties. Recent advancements in manufacturing technologies have led to the development of cellular solids with highly controllable microstructures and properties modulated for multiple functionalities at low structural weights. The concept of density gradation in cellular solids has recently gained attention due to its potentials in opening new doors to the development of lightweight structures that offer optimal physical and mechanical properties without compromising their favorable characteristics. Herein, a comprehensive insight into the fundamental concepts, fabrication, and current and potential applications of density‐graded cellular solids in various areas of science and engineering is provided. Cellular solids are broadly classified into two main categories: foams and lattice structures. An overview of the fundamental concepts in each category is presented, followed by details on the characterization approaches and some of the most novel processing techniques utilized in fabricating the structures. The uses of density‐graded structures in load‐bearing, acoustic, and biomedical applications are highlighted. The state of the art in each category and the current trends in application‐specific optimization of density‐graded structures are discussed. The review concludes with an outlook of the future directions in this exciting field.

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Drop weight impact behavior of functionally graded aluminum foam consisting of A1050 and A6061 aluminum alloys

Cited by 48 publications

References 19 publications

Plateau stress estimation of impact compression test on aluminum foam using X-ray computed tomography observation

Plateau stress estimation of impact compression test on aluminum foam using X-ray computed tomography observation

Investigation of Strain‐Rate Effects in Ni/PU Hybrid Foams under Low‐Impact Velocities

Density‐Graded Cellular Solids: Mechanics, Fabrication, and Applications

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