A study on the plasticity of soda-lime silica glass via molecular dynamics simulations
S Urata and Y Sato, JOURNAL OF CHEMICAL PHYSICS, 147, 174501 (2017).
Molecular dynamics (MD) simulations were applied to construct a plasticity model, which enables one to simulate deformations of soda- lime silica glass (SLSG) by using continuum methods. To model the plasticity, stress induced by uniaxial and a variety of biaxial deformations was measured by MD simulations. We found that the surfaces of yield and maximum stresses, which are evaluated from the equivalent stress-strain curves, are reasonably represented by the Mohr-Coulomb ellipsoid. Comparing a finite element model using the constructed plasticity model to a large scale atomistic model on a nanoindentation simulation of SLSG reveals that the empirical method is accurate enough to evaluate the SLSG mechanical responses. Furthermore, the effect of ion-exchange on the SLSG plasticity was examined by using MD simulations. As a result, it was demonstrated that the effects of the initial compressive stress on the yield and maximum stresses are anisotropic contrary to our expectations. Published by AIP Publishing.
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