Abstract
In order to multiaxial stress effect on subcritical crack growth under tension-compression stress state, dynamic fatigue tests of soda lime glass specimens having a controlled surface flaw introduced by Knoop indentation are conducted by diametral-compression loading of disks under different environments of vacuum, air, and ion exchanged water. The subcritical crack growth prameters, n, obtained from the stressing rate dependence of the fracture strength are compared with those obtained by four-point bending of plates (uniaxial tension) and by concentric ring loading of disks (equibiaxial tension) in our previous work. Though there being little significant multiaxial stress effect on n value in air environment, in water environment the n value obtained by diametral compression loading becomes obviously higher than that by concentric-ring loading of disks. The higher n value in diametral-compression can be attributed to the fact that the crack initiation from crack tip blunted by a corrosion action of water vapor will be restricted by hydrostatic compressive stress.
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