SYMPOSIA PAPER Published: 01 January 1994

A Computer-Aided Technique for the Determination of -Curves from Center-Cracked Panels of Nonstandard Proportions


The development of a technique for the measurement of fracture toughness using computer-aided data collection and analysis has greatly reduced the computation time, increased accuracy, and enabled crack resistance curves to be determined from center-cracked panels of nonstandard geometries. The effective crack length is determined from compliance measurements and a geometric correction to stress intensity factor for nonstandard geometries derived from fatigue crack growth data and from energy release-rate calculations. Fracture toughness tests have been conducted on panels up to 2 m wide with a length-to-width ratio of 0.5.

The technique is illustrated using results showing the effect of panel size and geometry for the 2024-T3 aluminum alloy.

Author Information

Sutton, GR
Defence Research Agency, Farnborough, UK
Thomas, CE
Defence Research Agency, Farnborough, UK
Wheeler, C
Defence Research Agency, Farnborough, UK
Wilson, RN
Defence Research Agency, Farnborough, UK
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Developed by Committee: E08
Pages: 186–198
DOI: 10.1520/STP13949S
ISBN-EB: 978-0-8031-5283-0
ISBN-13: 978-0-8031-1985-7