Compressive Behavior of Porous Metals with Aligned Unidirectional Pores Compressed in the Direction Perpendicular to the Pore Direction

Tomoya Tamai, Daiki Muto, Tomonori Yoshida, Mahiro Sawada, Shinsuke Suzuki, Matej Vesenjak, Zoran Ren

    Research output: Contribution to journalArticle

    Abstract

    The compressive behavior of porous A6061 alloy with aligned unidirectional pores was investigated. Porous specimens with various sizes and relative thicknesses (thickness t/length l) of cell walls were prepared via machining after various heat treatments. Compression tests were conducted on porous specimens in the direction perpendicular to the pore direction. Distributions of the equivalent plastic strain were obtained using digital image correlation. Finite element analyses were also conducted to obtain the stress and strain distributions. The compressive stress σ increased with the increase in the compressive strain, and the increase in σ was then suppressed. Using a newly constructed deformation model, it was revealed that a plateau region was initiated by the plastic collapse of the cell walls. After the occurrence of the plastic collapse, three deformation modes were found in the compression of the specimens with various t/l. These modes transitioned from plastic buckling to fracture, and then to rapid densification without plastic buckling and fracture, depending on t/l. The sharp increase in the horizontal strain and the suppression of the decrease in the porosity occurred simultaneously when σ increased sharply again, irrespective of the structure and heat treatment of the specimens; this was observed as the plateau end.

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    plastics
    Metals
    Plastics
    porosity
    metals
    Buckling
    buckling
    Heat treatment
    Cells
    plateaus
    heat treatment
    Compressive stress
    Densification
    strain distribution
    compression tests
    Plastic deformation
    densification
    Machining
    machining
    Porosity

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys

    Cite this

    Compressive Behavior of Porous Metals with Aligned Unidirectional Pores Compressed in the Direction Perpendicular to the Pore Direction. / Tamai, Tomoya; Muto, Daiki; Yoshida, Tomonori; Sawada, Mahiro; Suzuki, Shinsuke; Vesenjak, Matej; Ren, Zoran.

    In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 01.01.2019.

    Research output: Contribution to journalArticle

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    abstract = "The compressive behavior of porous A6061 alloy with aligned unidirectional pores was investigated. Porous specimens with various sizes and relative thicknesses (thickness t/length l) of cell walls were prepared via machining after various heat treatments. Compression tests were conducted on porous specimens in the direction perpendicular to the pore direction. Distributions of the equivalent plastic strain were obtained using digital image correlation. Finite element analyses were also conducted to obtain the stress and strain distributions. The compressive stress σ increased with the increase in the compressive strain, and the increase in σ was then suppressed. Using a newly constructed deformation model, it was revealed that a plateau region was initiated by the plastic collapse of the cell walls. After the occurrence of the plastic collapse, three deformation modes were found in the compression of the specimens with various t/l. These modes transitioned from plastic buckling to fracture, and then to rapid densification without plastic buckling and fracture, depending on t/l. The sharp increase in the horizontal strain and the suppression of the decrease in the porosity occurred simultaneously when σ increased sharply again, irrespective of the structure and heat treatment of the specimens; this was observed as the plateau end.",
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    AU - Muto, Daiki

    AU - Yoshida, Tomonori

    AU - Sawada, Mahiro

    AU - Suzuki, Shinsuke

    AU - Vesenjak, Matej

    AU - Ren, Zoran

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