Title of article :
Initiation of shear bands near a stress concentration in metallic glass Original Research Article
Author/Authors :
C.E. Packard، نويسنده , , C.A Schuh، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2007
Abstract :
Instrumented contact experiments are performed on three metallic glasses to systematically study shear band formation near a stress concentration. The results suggest that high local stresses at a point in the glass are insufficient to initiate a shear band. Rather, the yield strength must be exceeded along the entire length of a viable shear path in order for a shear band to form. Because of this, conventional analyses to extract shear yield stresses from Hertzian contact experiments overestimate the glass strength by a factor of three or more. In contrast, the interpretation of shear band initiation as yield on a plane agrees with recent experimental observations on metallic glasses that pertain to the slip-line field, and can rationalize the experimental contact load measurements as well as the shear band path.
Keywords :
Metallic glasses , Shear bands , Nanoindentation , Stress concentration
Journal title :
ACTA Materialia
Journal title :
ACTA Materialia