(Received 20 July 1989; accepted 11 January 1990)
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It often occurs in J-R testing that some of the initial crack extension (Δa) data points have anomalous negative values. ASTM Methods E 813-87 and E 813-81, however, do not specify any procedures for treating such data. We propose a procedure for data analysis which utilizes the negative Δa values and is consistent with ASTM E 813-87. The proposed correction procedure is illustrated using a data set for austenitic steel; also, JIc values obtained using ASTM E 813-87 are compared to those obtained from its predecessor E 813-81.
On a sabbatical from the Nuclear Research Center—Negev, Beer Sheva,
National Institute of Standards and Technology, Materials Reliability Division, Boulder, CO
Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, CO
Stock #: JTE12488J