SYMPOSIA PAPER Published: 01 January 1986

Near-Tip Crack Displacement Measurements During High-Temperature Fatigue


A laser-based interferometric technique was used to measure crack opening displacements near the tips of fatigue cracks in superalloy compact tension specimens at 23 and 650°C. Measured compliances showed reasonable agreement with predictions of linear elastic fracture mechanics at both temperatures. The opening load ratios were easily determined by the minicomputer-controlled measurement system and where found to be independent of temperature, crack length, and precracking level when they were measured at positions more than half the specimen thickness away from the tip.

Author Information

Sharpe, WN
The Johns Hopkins University, Baltimore, MD
Lee, JJ
The Johns Hopkins University, Baltimore, MD
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Developed by Committee: E08
Pages: 253–264
DOI: 10.1520/STP17400S
ISBN-EB: 978-0-8031-4972-4
ISBN-13: 978-0-8031-0472-3