Premium
Subcritical Crack Growth in Soda‐Lime Glass in Combined Mode I and Mode II Loading
Author(s) -
Singh Dileep,
Shelty Dinesh K.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb04264.x
Subject(s) - materials science , composite material , mode (computer interface) , fracture toughness , strain energy release rate , soda lime glass , crack closure , strain energy , fracture mechanics , structural engineering , finite element method , computer science , engineering , operating system
Subcritical crack growth under mixed‐mode loading was studied in soda‐lime glass. Pure mode I, combined mode I and mode II, and pure mode II loadings were achieved in precracked disk specimens by loading in diametral compression at selected angles with respect to the symmetric radial crack. Crack growth was monitored by measuring the resistance changes in a microcircuit grid consisting of parallel, electrically conducting grid lines deposited on the surface of the disk specimens by photolithography. Subcritical crack growth rates in pure mode I, pure mode II, and combined mode I and mode II loading could be described by an exponential relationship between crack growth rate and an effective crack driving force derived from a mode I‐mode II fracture toughness envelope. The effective crack driving force was based on an empirical representation of the non‐coplanar strain energy release rate. Stress intensities for kinked cracks were assessed using the method of caustics and an initial decrease and a subsequent increase in the subcritical crack growth rates of kinked cracks were shown to correlate with the variations of the mode I and the mode II stress intensities.