Finite element analysis of compressive deformation of bulk metallic glasses

Hyoung Seop Kim, Hidemi Kato, Akihisa Inoue, Ho Sou Chen

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Finite element analysis of a stress-overshoot phenomenon in a Pd-based bulk metallic glass was carried out using a fictive stress model in conjunction with the Maxwell viscoelastic model under uniaxial compression. The overshoot results from non-linear viscoelasticity in the glass transition region, under deformation at constant strain rate. The friction effect between a cylindrical workpiece and a die was shown to produce mainly three stress-concentration sites, which play an important role in creating free volume. These sites give rise to a redistribution of the structural disordering state inside the workpiece, and lead to a change of the average stress blunt. Once inhomogeneous deformation occurs during the development of the stress peak at the initial stages under high strain rates (5 × 10-3-2.2 × 10 -2 s-1), the effective stress distribution within the workpiece becomes narrow and the deformation homogeneity is recovered in the ensuing steady state flow.

Original languageEnglish
Pages (from-to)3813-3823
Number of pages11
JournalActa Materialia
Volume52
Issue number13
DOIs
Publication statusPublished - 2004 Aug 2

Keywords

  • Bulk metallic glasses
  • Constitutive model
  • Deformation behaviour
  • Fictive stress model
  • Finite element analysis

ASJC Scopus subject areas

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

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