Homogenization of steady-state creep of porous metals using three-dimensional microstructural reconstructions

Kawai Kwok, Dino Boccaccini, Åsa Helen Persson, Henrik Lund Frandsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effective steady-state creep response of porous metals is studied by numerical homogenization and analytical modeling in this paper. The numerical homogenization is based on finite element models of three-dimensional microstructures directly reconstructed from tomographic images. The effects of model size, representativeness, and boundary conditions on the numerical results are investigated. Two analytical models for creep rate of porous bodies are derived by extending the Hashin-Shtrikman bound and the Ramakrishnan-Arunchalam model in linear elasticity to steady-state creep based on nonlinear homogenization. The numerical homogenization prediction and analytical models obtained in this work are compared against reported measurements and models. The relationship between creep rate and porosity computed by homogenization is found to be bounded by the Hodge-Dunand model and the Hashin-Shtrikman creep model, and closely matched by the Gibson-Ashby compression and the Ramakrishnan-Arunchalam creep models. [All rights reserved Elsevier].
Original languageEnglish
JournalInternational Journal of Solids and Structures
Volume78-79
Pages (from-to)38-46
Number of pages9
ISSN0020-7683
DOIs
Publication statusPublished - 2016

Keywords

  • Porous metal
  • Numerical homogenization
  • Microstructure reconstruction
  • Creep
  • Solid oxide fuel cell

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