Abstract
Time‐dependent deformation behavior induced by an indentation, called indentation creep, was investigated for Na2O · 3SiO2 glasses with various water contents by measuring the indentation depth as a function of time using a conical indenter. It was found that the indentation creep behavior of the glasses could be best explained as steady‐state inhomogeneous (non‐Newtonian viscous) flow. Water in the glasses appeared to reduce the stress (or yield stress) needed to cause this flow. Crack initiation of the glasses was promoted by water through this inhomogeneous flow.
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