Shear band formation in amorphous materials under oscillatory shear deformation

Abstract

The effect of periodic shear on strain localization in disordered solids is investigated using molecular dynamics simulations. We consider a binary mixture of one million atoms annealed to a low temperature with different cooling rates and then subjected to oscillatory shear deformation with a strain amplitude slightly above the critical value. It is found that the yielding transition occurs during one cycle but the accumulation of irreversible displacements and initiation of the shear band proceed over larger number of cycles for more slowly annealed glasses. The spatial distribution and correlation function of nonaffine displacements reveal that their collective dynamics changes from homogeneously distributed small clusters to a system-spanning shear band. The analysis of spatially averaged profiles of nonaffine displacements indicates that the location of a shear band in periodically loaded glasses can be identified at least several cycles before yielding. These insights are important for development of novel processing methods and prediction of the fatigue lifetime of metallic glasses.

24 pages, 11 figures, https://youtu.be/sRQ69H0p9hE

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Cited by in corpus (11)

• Glass stability changes the nature of yielding under oscillatory shear
• Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions
• Structural relaxation in amorphous materials under cyclic tension-compression loading
• Accessing a broader range of energy states in metallic glasses by variable-amplitude oscillatory shear
• Alternating shear orientation during cyclic loading facilitates yielding in amorphous materials
• A delayed yielding transition in mechanically annealed binary glasses at finite temperature
• Fatigue behavior of Cu-Zr metallic glasses under cyclic loading
• Fatigue failure of amorphous alloys under cyclic shear deformation
• Relaxation dynamics in amorphous alloys under asymmetric cyclic shear deformation
• Shear band healing in amorphous materials by small-amplitude oscillatory shear deformation
• Correlation between plastic rearrangements and local structure in a cyclically driven glass