Abstract
The recent advances in time-dependent fracture mechanics concepts for characterizing creep crack growth rate under transient conditions are reviewed. At elevated temperatures, transients in the crack tip stress fields occur owing to stress relaxation during constrained creep due to primary and tertiary creep deformation, cyclic loading and crack growth. A unified crack tip parameter Ct which is formulated to account for all types of transient is described and evaluated. The currently available creep crack growth data support the validity of Ct. Under steady state conditions, Ct reduces to the familiar C∗ integral.
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