Finite element modeling of creep deformation in cellular metals

Scott M. Oppenheimer, David C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

The creep of reticulated metallic foams is studied through the finite element method using three-dimensional, periodic unit cells with four different architectures characterized by struts which deform primarily by: (i) simple bending, (ii) compression, (iii) a combination of simple bending and compression and (iv) double bending (for Kelvin space-filling tetrakaidecahedra). The creep behavior of each of these models is examined with respect to temperature, stress and foam relative density. Calculated creep rates for both bending and compression models are below those predicted from simplified analytical models and bracket those of the combination model. The simple and double bending models predict nearly identical strain rates despite very different geometries, because in both cases the deflection rates of the fastest deforming struts are similar. Both analytical and numerical predictions are compared to published creep data for metallic foams.

Original languageEnglish (US)
Pages (from-to)3825-3834
Number of pages10
JournalActa Materialia
Volume55
Issue number11
DOIs
StatePublished - Jun 1 2007

Keywords

  • Creep
  • Finite element modeling
  • Open-cell foams

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Finite element modeling of creep deformation in cellular metals'. Together they form a unique fingerprint.

Cite this