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Poster

Initiation of plateau region during compression test of porous metals with aligned unidirectional pores

Wednesday (24.10.2018)
19:39 - 19:42
Part of:
Line-Up:
- Poster Battery housings for electric vehicles using CFRP and aluminium foam 0 Joachim Baumeister
- Poster Manufacturing and characterization of open-cell stainless steel foams by investment casting 1 Jan Frömert
- Poster Interface formation of Mg2X (X = Si, Sn) in cellular Si infiltrated by Mg(Sn) alloys 1 Alexander M. Matz
- Poster Production of microcellular PMMA using the bead foaming technology 1 Mikel Mugica
- Poster Nanocellular PMMA with tunable cellular structure by changing the rheological behaviour of the polymer matrix. 1 Judith Martín de León
- Poster Production of thermoplastic polyurethane foams synthesized with different contents of hard segment and graphene nanoplatelets by the gas dissolution foaming process 1 Ph.D. Mercedes Santiago-Calvo
- Poster Surface functionalized filters for aluminum melt filtration 1 Dr.-Ing. Claudia Voigt
- Poster Nanocellular polymers based on PMMA/sepiolite nanocomposites: characterization of the mechanical behaviour 1 Victoria Bernardo
- Poster Impact resistant foams based on PP/POE blends 1 Ph.D. Santiago Munoz Pascual
- Poster Crosslinked open cell ethylene butyl acrylate copolymer (EBA) foams: properties and applications 1 Ph.D. Eduardo López
- Poster Influence of molecular weight in the solubility,diffusivity and the subsequent cellular structure of polystyrene foams 1 Ph.D. Alberto Ballesteros
- Poster Crushing strength measurement at reticulated ceramic foams ex situ and in situ CT analysis 1 Dr.-Ing. Claudia Voigt
- Poster Initiation of plateau region during compression test of porous metals with aligned unidirectional pores 1 Tomoya Tamai
- Poster Active meta-materials with adjustable pore size 1 Dr. Reza Hedayati
- Poster Polymeric foams 3D numerical mechanical modelling 1 Stefano Tagliabue
- Poster Characterisation of NiTi cellular materials fabricated by the powder-metallurgy spaceholder technique 1 Dr. Karl Dahm
- Poster Accurate separation of open cell metal foams using remote laser cutting technique 1 Robert Baumann
- Poster Generation of artificial foam structures and evaluation of their thermo-mechanical, flow and filtration characteristics (Poster) 1 Christoph Settgast
- Poster Surface modification of magnesium-based foams by Directed Plasma Nanosynthesis 1 Viviana Marcela Posada Pérez

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Porous metals are often used as shock absorbers due to their high energy absorption capabilities. The characteristic plateau region of porous metals under compressive loading is important for the practical use of porous metals and should thus be investigated. Especially the relationship between the deformation behavior and the initiation of the plateau region should be clarified. In this study, the deformation of porous metals with aligned unidirectional pores compressed in the direction perpendicular to the pore direction was modeled to investigate the mechanism of the plateau region initiation. The criteria for the plateau region initiation was investigated by studying the distribution of strain and stress during compression obtained by digital imaging (digital image correlation -DIC) and computational simulations using the finite element method (FEM).

Porous A6061 specimens with aligned unidirectional pores (size: 25×25×25mm^3, pore diameter: 3mm, center distance of pores: 4.8mm, porosity: 29.2%) were prepared by machining. The specimens were compressed in the direction perpendicular to the pore orientation in accordance with the ISO 13314 standard. The distribution of equivalent plastic strain was investigated by the DIC during the compression tests. Furthermore, the distribution of equivalent stress and equivalent plastic strain was obtained by the FEM.

The compressive stress increased with increase of the compressive strain in the range from 0 to 3 %. From 3 to 30 % strain the increase of the compressive stress was suppressed. The quasi-static computational model, which also considered the local deformation of porous metal in terms of bending and shear deformation of the cell walls, showed the local plastic collapse occurred when compressive strain reached approximately 3 %. The stress distribution obtained by DIC and FEM analysis showed an excellent comparison. It was therefore revealed the plateau region is initiated by the local plastic collapse of the porous metal with aligned unidirectional pores.

Speaker:
Tomoya Tamai
Waseda University
Additional Authors:
  • Daiki Muto
    Waseda University
  • Tomonori Yoshida
    Waseda University
  • Prof. Dr. Shinsuke Suzuki
    Waseda University
  • Dr. Matej Vesenjak
    University of Maribor
  • Prof. Dr. Zoran Ren
    University of Maribor