Effect of Hydrostatic Pressure on the Fracture Strength of Soda-Lime Glass : Investigation with Respect to Subecritical 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.