Structural transformations in porous glasses under mechanical loading. II. Compression

Abstract

The role of porous structure and glass density in response to compressive deformation of amorphous materials is investigated via molecular dynamics simulations. The disordered, porous structures were prepared by quenching a high-temperature binary mixture below the glass transition into the phase coexistence region. With decreasing average glass density, the pore morphology in quiescent samples varies from a random distribution of compact voids to a porous network embedded in a continuous glass phase. We find that during compressive loading at constant volume, the porous structure is linearly transformed in the elastic regime and the elastic modulus follows a power-law increase as a function of the average glass density. Upon further compression, pores deform significantly and coalesce into large voids leading to formation of domains with nearly homogeneous glass phase, which provides an enhanced resistance to deformation at high strain.

25 pages, 12 figures

References in corpus (4)

• Influence of the glass transition on the liquid-gas spinodal decomposition
• Evolution of the pore size distribution in sheared binary glasses
• Structural transformations in porous glasses under mechanical loading. I. Tension
• Distributions of pore sizes and atomic densities in binary glasses revealed by molecular dynamics simulations

Cited by in corpus (3)

• The influence of periodic shear on structural relaxation and pore redistribution in binary glasses
• Structural transformations during periodic deformation of low-porosity amorphous materials
• Structural relaxation of porous glasses due to internal stresses and deformation under tensile loading at constant pressure