Evolution of the pore size distribution in sheared binary glasses

Abstract

Molecular dynamics simulations are carried out to investigate mechanical properties and porous structure of binary glasses subjected to steady shear. The model vitreous systems were prepared via thermal quench at constant volume to a temperature well below the glass transition. The quiescent samples are characterized by a relatively narrow pore size distribution whose mean size is larger at lower glass densities. We find that in the linear regime of deformation, the shear modulus is a strong function of porosity, and the individual pores become slightly stretched while their structural topology remains unaffected. By contrast, with further increasing strain, the shear stress saturates to a density-dependent plateau value, which is accompanied by pore coalescence and a gradual development of a broader pore size distribution with a discrete set of peaks at large length scales.

30 pages, 16 figures

References in corpus (7)

• Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture I: The van Hove Correlation Function
• Strain localization and percolation of stable structure in amorphous solids
• Arrested phase separation in a short-ranged attractive colloidal system: A numerical study
• Formation and growth of shear bands in glasses: existence of an underlying directed percolation transition
• Influence of the glass transition on the liquid-gas spinodal decomposition
• Intermittent dynamics and logarithmic domain growth during the spinodal decomposition of a glass-forming liquid
• Collective nonaffine displacements in amorphous materials during large-amplitude oscillatory shear

Cited by in corpus (6)

• The influence of periodic shear on structural relaxation and pore redistribution in binary glasses
• Structural transformations in porous glasses under mechanical loading. I. Tension
• Structural transformations in porous glasses under mechanical loading. II. Compression
• Structural transformations during periodic deformation of low-porosity amorphous materials
• Violation of Stokes-Einstein and Stokes-Einstein-Debye relations in polymers at the gas-supercooled liquid coexistence
• Structural relaxation of porous glasses due to internal stresses and deformation under tensile loading at constant pressure