Journal
INTERMETALLICS
Volume 79, Issue -, Pages 12-19Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2016.09.001
Keywords
Notch sensitivity; Cohesive crack; Shear bands
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
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Recent experiments in notched bulk metallic glasses have found reduced, or insensitive, or improved strengths, while in many of these cases the ductile strain prior to final failure is enhanced. First, although the inverse notch effect is explained by a shift from shear localization to cavitation failure, it is suggested in this work that the synergistic effect between cohesive fracture at the notched area and shear bands emanating from the notch roots may extend the parametric space for the notch insensitive behavior. Second, the dependence of shear band patterns on notch geometric factors is determined by the Rudnicki-Rice theory and the free-volume-based finite element simulations. These results suggest conditions for shear band multiplication to take place and for the shear-localization-induced failure to be delayed. (C) 2016 Elsevier Ltd. All rights reserved.
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