SYMPOSIA PAPER Published: 01 January 1988

Evaluation of the Parameter for Characterizing Creep Crack Growth Rate in the Transient Regime


An in-depth evaluation of the Ct parameter, which has been proposed for characterizing the creep crack growth behavior under small-scale-creep (transient) to extensive creep conditions, is conducted. The evaluation includes a thorough examination of the assumptions made in the definition of Ct, an experimental evaluation, and a finite-element analysis of a compact specimen used in an actual creep crack growth experiment.

The experimental correlations between da/dt and Ct are extremely encouraging. Ct is interpreted as the stress-power (or energy rate) release rate during crack extension. Under extensive creep conditions, Ct therefore equals C*, which is given in terms of a path-independent integral as well as the stress-power release rate. Under small-scale creep, Ct is shown to characterize the rate of growth of the creep zone. More finite-element analyses and experiments under highly transient conditions are recommended for completing the understanding of the creep crack growth behavior in this regime.

Author Information

Bassani, JL
University of Pennsylvania, Philadelphia, PA
Hawk, DE
Harvard University, Cambridge, MA
Saxena, A
Schools of Materials Engineering, Mechanical Properties Research Laboratory, Georgia Institute of Technology, Atlanta, GA
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Developed by Committee: E08
Pages: 7–26
DOI: 10.1520/STP26768S
ISBN-EB: 978-0-8031-5063-8
ISBN-13: 978-0-8031-1174-5