Alternating shear orientation during cyclic loading facilitates yielding in amorphous materials

Abstract

The influence of alternating shear orientation and strain amplitude of cyclic loading on yielding in amorphous solids is investigated using molecular dynamics simulations. The model glass is represented via a binary mixture that was rapidly cooled well below the glass transition temperature and then subjected to oscillatory shear deformation. It was shown that periodic loading at strain amplitudes above the critical value first induces structural relaxation via irreversible displacements of clusters of atoms during a number of transient cycles, followed by an increase in potential energy due to the formation of a system-spanning shear band. Upon approaching the critical strain amplitude from above, the number of transient cycles required to reach the yielding transition increases. Interestingly, it was found that when the shear orientation is periodically alternated in two or three dimensions, the number of transient cycles is reduced but the critical strain amplitude remains the same as in the case of periodic shear along a single plane. After the yielding transition, the material outside the shear band continues strain-induced relaxation, except when the shear orientation is alternated in three dimensions and the glass is deformed along the shear band with the imposed strain amplitude every third cycle.

22 pages, 8 figures

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Cited by in corpus (10)

• Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions
• Accessing a broader range of energy states in metallic glasses by variable-amplitude oscillatory shear
• A delayed yielding transition in mechanically annealed binary glasses at finite temperature
• Fatigue behavior of Cu-Zr metallic glasses under cyclic loading
• Cooling under applied stress rejuvenates amorphous alloys and enhances their ductility
• Annealing effects of multidirectional oscillatory shear in model glass formers
• Structural relaxation and delayed yielding in cyclically sheared Cu-Zr metallic glasses
• 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