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The crack growth resistance curve (R-curve) appears to be a viable approach to elastic-plastic fracture analysis. An automated technique for R-curve testing and analysis provides the opportunity to enhance accuracy and resolution while reducing variability due to influences of the test operator and data analyst. A microcomputer-based test control, data acquisition, and analysis system is described. Details of the test hardware, procedures utilized for the conduct of R-curve experiments, and methods for the analysis of the data are presented. The results demonstrate the quality and reproducibility obtained by the technique.
fracture mechanics, elastic-plastic fracture, R-curve, data acquisition
Head, Fracture Mechanics Section, Naval Research Laboratory, Washington, DC,