Fatigue failure of amorphous alloys under cyclic shear deformation
arXiv:2301.07857 · doi:10.1016/j.commatsci.2023.112230
Abstract
The accumulation of plastic deformation and flow localization in amorphous alloys under periodic shear are investigated using molecular dynamics simulations. We study a well-annealed binary mixture of one million atoms subjected to oscillatory shear deformation with strain amplitudes slightly above a critical value. We find that upon approaching a critical strain amplitude from above, the number of shear cycles until the yielding transition is well described by a power-law function. Remarkably, the potential energy at the end of each cycle as a function of the normalized number of cycles is nearly independent of the strain amplitude, which allows for estimation of the fatigue lifetime at a given strain amplitude. The analysis on nonaffine displacements of atoms elucidates the process of strain localization, including irreversible rearrangements of small clusters until the formation of a system-spanning shear band.
arXiv comment20 pages, 8 figures
References in corpus (21)
- Dynamics of Viscoplastic Deformation in Amorphous Solids
- Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture I: The van Hove Correlation Function
- The yielding transition in amorphous solids under oscillatory shear deformation
- Oscillatory athermal quasi-static deformation of a model glass
- Onset of Irreversibility and Chaos in Amorphous Solids Under Periodic Shear
- Macroscopic yielding in jammed solids is accompanied by a non-equilibrium first-order transition in particle trajectories
- Glass stability changes the nature of yielding under oscillatory shear
- Heterogeneous relaxation dynamics in amorphous materials under cyclic loading
- Strain localisation above the yielding point in cyclically deformed glasses
- Reversible plastic events during oscillatory deformation of amorphous solids
- Collective nonaffine displacements in amorphous materials during large-amplitude oscillatory shear
- Mechanical annealing of model glasses: Effects of strain amplitude and temperature
- The yielding transition in periodically sheared binary glasses at finite temperature
- Nonaffine rearrangements of atoms in deformed and quiescent binary glasses
- Accelerated relaxation in disordered solids under cyclic loading with alternating shear orientation
- Shear band formation in amorphous materials under oscillatory shear deformation
- 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
- Slow fatigue and highly delayed yielding via shear banding in oscillatory shear
- Anomalous softness in amorphous matter in the reversible plastic regime