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Since the development of the unloading compliance method, numerous improvements to this JIc and J-R curve testing procedure have occurred over the past five years. This paper presents a description of many of these test technique improvements along with the results of the improvements.
Improvements in both mechanical and electrical systems are shown to greatly improve the reproducibility of the unloading compliance data. Computerization of the data reduction has led to a better understanding of the requirements necessary for an accurate J-versus-Δa R-curve.
crack growth, J-R curve, unloading compliance method, plasticity, computers
Special marketing representative, Westinghouse R&D Center, Pittsburgh, Pa.