Effect of hydrostatic pressure on the fracture strength of soda-lime glass. (Investigation with respect to subcritical crack growth)

Abstract

In order to examine the effect of subcritical crack growth on fracture strength under multiaxial stress by considering subcritical crack growth, soda-lime glass specimens having a controlled surface flaw introduced by Knoop microhardness indentation were fractured by four-point bending under different hydrostatic pressures up to 100 MPa and different stressing rate conditions. For both as-indented specimens and specimens without residual stresses, it was found that the fracture stress evidently increased under hydrostatic pressure of 100 MPa and a high stressing rate condition, as subcritical crack growth was fully restricted under those conditions.