The influence of periodic shear on structural relaxation and pore redistribution in binary glasses

Abstract

The evolution of porous structure, potential energy and local density in binary glasses under oscillatory shear deformation is investigated using molecular dynamics simulations. The porous glasses were initially prepared via a rapid thermal quench from the liquid state across the glass transition and allowed to phase separate and solidify at constant volume, thus producing an extended porous network in an amorphous solid. We find that under periodic shear, the potential energy decreases over consecutive cycles due to gradual rearrangement of the glassy material, and the minimum of the potential energy after thousands of shear cycles is lower at larger strain amplitudes. Moreover, with increasing cycle number, the pore size distributions become more skewed toward larger length scales where a distinct peak is developed and the peak intensity is enhanced at larger strain amplitudes. The numerical analysis of the local density distribution functions demonstrates that cyclic loading leads to formation of higher density solid domains and homogenization of the glass phase with reduced density.

23 pages, 10 figures

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Cited by in corpus (8)

• Accelerated relaxation in disordered solids under cyclic loading with alternating shear orientation
• Shear band formation in amorphous materials under oscillatory shear deformation
• Structural relaxation in amorphous materials under cyclic tension-compression loading
• Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions
• Spatiotemporal analysis of nonaffine displacements in disordered solids sheared across the yielding point
• Alternating shear orientation during cyclic loading facilitates yielding in amorphous materials
• A delayed yielding transition in mechanically annealed binary glasses at finite temperature
• Shear band healing in amorphous materials by small-amplitude oscillatory shear deformation