  The time evolution of the pore size distributions and mechanical properties
of amorphous solids at constant pressure is studied using molecular dynamics
simulations. The porous glasses were initially prepared at constant volume
conditions via a rapid thermal quench from the liquid state to the glassy
region and allowing for simultaneous phase separation and material
solidification. We found that at constant pressure and low temperature, the
porous network becomes more compact and the glassy systems relocate to
progressively lower levels of the potential energy. Although the elastic
modulus and the average glass density both increase with the waiting time,
their dependence is described by the power-law function with the same exponent.
Moreover, the results of numerical simulations demonstrated that under tensile
loading at constant pressure, low-density porous samples become significantly
deformed and break up into separate domains at high strain, while dense glasses
form a nearly homogeneous solid material.
