SYMPOSIA PAPER Published: 01 January 1985

Krak-Gages for Automated Fatigue Crack Growth Rate Testing: A Review


Bondable Krak-gages were utilized to monitor fatigue crack growth rates (FCGR) of various steels in air and salt water at 24°C and in wet hydrogen at 80°C. The FCGR data generated via bondable Krak-gages were consistent with those generated via either the compliance technique or optical measurements. Moreover, Krak-gages were effective in monitoring short crack extension.

Using atomic fusion technology, Krak-gages were sputtered on specimens so as to perform high-temperature (288 and 427°C) FCGR experiments. The FCGR results obtained with the sputtered Krak-gages were in good agreement with those obtained by the compliance method.

The Krak-gages were found to be a valuable addition to fracture mechanics testing. They readily interface with computers for fully automated FCGR experiments.

Author Information

Liaw, PK
Westinghouse R&D Center, Pittsburgh, PA
Logsdon, WA
Westinghouse R&D Center, Pittsburgh, PA
Roth, LD
Westinghouse R&D Center, Pittsburgh, PA
Hartmann, H-R
Hartrun Corp., Chaska, MN
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Developed by Committee: E08
Pages: 177–196
DOI: 10.1520/STP32887S
ISBN-EB: 978-0-8031-4942-7
ISBN-13: 978-0-8031-0421-1