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. Author manuscript; available in PMC: 2021 Jun 11.
Published in final edited form as: Appl Phys Rev. 2020;7(4):10.1063/5.0012851. doi: 10.1063/5.0012851

FIG. 8.

FIG. 8.

Diagram of the effect of stress ratio on the HA-FCGR. An increase in stress ratio causes a lowering of the stress intensity required for the onset of crack acceleration (which is tied to the maximum stress intensity factor) and causes a lowering of the stress for the onset of stage III FCGR.104 Note that there is no effect of stress ratio on the FCGR in air or inert environments. Adapted from Suresh and Ritchie, Met. Sci. 16, 529 (1982).104 Copyright 1982 Taylor and Francis.