SYMPOSIA PAPER Published: 01 January 1981
STP28815S

A More Basic Approach to the Analysis of Multiple-Specimen R-Curves for Determination of

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Multiple specimen J-R curves were developed for groups of 25.4-mm-thick (1T) compact specimens with different a/W values and depth of side grooving. The purpose of this investigation was to determine Jc (J at the onset of crack extension) for each group. Judicious selection of points on the load versus load-line deflection record at which to unload and heat-tint specimens permitted direct observation of approximate onset of crack extension. It was found that the present recommended procedure for determining Jc from multiple-specimen R-curves, which is being considered for standardization, consistently yielded nonconservative Jc-values. A more basic approach to analyzing multiple-specimen R-curves is presented, applied, and discussed. This analysis determined Jc-values that closely corresponded to actual observed onset of crack extension.

Author Information

Carlson, KW
Westinghouse Handford Co., Richland, Wash.
Williams, JA
Westinghouse Handford Co., Richland, Wash.
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Details
Developed by Committee: E08
Pages: 503–524
DOI: 10.1520/STP28815S
ISBN-EB: 978-0-8031-4809-3
ISBN-13: 978-0-8031-0732-8