TY - JOUR
T1 - Modeling size effects on fatigue life of a zirconium-based bulk metallic glass under bending
AU - Yuan, Tao
AU - Wang, Gongyao
AU - Feng, Qingming
AU - Liaw, Peter K.
AU - Yokoyama, Yoshihiko
AU - Inoue, Akihisa
N1 - Funding Information:
The present work is supported by the National Science Foundation (NSF), the Combined Research-Curriculum Development (CRCD) Program, under EEC-9527527 and EEC-0203415, the Integrative Graduate Education and Research Training (IGERT) Program, under DGE-9987548, the International Materials Institutes (IMI) Program, under DMR-0231320, the Major Research Instrumentation (MRI) Program, under DMR-0421219, the Division of Civil, Mechanical, and Manufacturing Innovation Program, under CMMI-0900271, CMMI-0926420 and CMMI-1100080, the Materials World Network Program, under DMR-0909037 and the Department of Energy (DOE), Office of Nuclear Energy’s Nuclear Energy University Program (NEUP-00119262) and the DOE, Office of Fossil Energy, National Energy Technology Laboratory (DE-FE-0008855), with Ms. M. Poats, Dr. C.V. Hartesveldt, Dr. D. Dutta, Dr. P.W. Jennings, Dr. L.S. Goldberg, Dr. L. Clesceri, Dr. C. Huber, Dr. C.E. Bouldin, Dr. C.V. Cooper, Dr. R. Barton, Dr. A. Ardell, Dr. E.M. Taleff, Mr. V. Cedro and Dr. R. Jensen as contract monitors.
PY - 2013/1
Y1 - 2013/1
N2 - 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.
AB - 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.
KW - Bending test
KW - Bulk metallic glasses
KW - Fatigue-life modeling
KW - Weibull distribution
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U2 - 10.1016/j.actamat.2012.09.057
DO - 10.1016/j.actamat.2012.09.057
M3 - Article
AN - SCOPUS:84869090375
SN - 1359-6454
VL - 61
SP - 273
EP - 279
JO - Acta Materialia
JF - Acta Materialia
IS - 1
ER -