Modeling size effects on fatigue life of a zirconium-based bulk metallic glass under bending

Tao Yuan, Gongyao Wang, Qingming Feng, Peter K. Liaw, Yoshihiko Yokoyama, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A size effect on the fatigue-life cycles of a Zr 50Cu 30Al 10Ni 10 (at.%) bulk metallic glass has been observed in the four-point-bending fatigue experiment. Under the same bending-stress condition, large-sized samples tend to exhibit longer fatigue lives than small-sized samples. This size effect on the fatigue life cannot be satisfactorily explained by the flaw-based Weibull theories. Based on the experimental results, this study explores possible approaches to modeling the size effects on the bending-fatigue life of bulk metallic glasses, and proposes two fatigue-life models based on the Weibull distribution. The first model assumes, empirically, log-linear effects of the sample thickness on the Weibull parameters. The second model incorporates the mechanistic knowledge of the fatigue behavior of metallic glasses, and assumes that the shear-band density, instead of the flaw density, has significant influence on the bending fatigue-life cycles. Promising predictive results provide evidence of the potential validity of the models and their assumptions.

Original languageEnglish
Pages (from-to)273-279
Number of pages7
JournalActa Materialia
Issue number1
Publication statusPublished - 2013 Jan


  • Bending test
  • Bulk metallic glasses
  • Fatigue-life modeling
  • Weibull distribution

ASJC Scopus subject areas

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


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