Abstract
Many brittle materials exhibit a time-independent R curve behaviour, whereby the crack tip stress intensity increases during crack growth. This increase is associated with the formation of a ligament zone behind the crack tip, the restraining stresses due to the crack-bridging elements within this zone being responsible for the stress intensity increase. This paper uses an appropriate theoretical model to represent the ligament zone, and demonstrates the extent to which the crack growth resistance curve is influenced by geometrical parameters.
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