This paper reports an extension of a previous study that compared methods of evaluating J by the crack mouth opening displacement and by surface strain gradients. Here, the surface strain gradients are measured by three-dimensional digital image correlation. The results herein represent a small test matrix that involved evaluation of the J-integral for clamped single-edge notched tensile specimens from API 5L X65 base-metal, weld metal and the adjacent heat affected zone; the J-integral was evaluated by a standardized procedure utilizing the crack mouth opening displacement (CMOD) and by the contour integral method on an external surface strain contour. Digital image correlation provides sufficient full-field strain data for use by this method and is considerably more robust than surface-mounted strain gage instrumentation. A series of validity checks are presented that demonstrate that the data are useful and valuable. Experimental determination of the J-integral is not limited to thoroughly analyzed test geometries and may be achieved with limited instrumentation. Furthermore, the method described does not require a determination of crack size nor any instrumentation that requires access to the crack mouth.
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Comparison of J-Integral Measurement Methods on Clamped Single-Edge Notched Tension Specimens
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Weeks, TS, Sowards, JW, Rentz, RA, Read, DT, & Lucon, E. "Comparison of J-Integral Measurement Methods on Clamped Single-Edge Notched Tension Specimens." Proceedings of the 2016 11th International Pipeline Conference. Volume 3: Operations, Monitoring and Maintenance; Materials and Joining. Calgary, Alberta, Canada. September 26–30, 2016. V003T05A017. ASME. https://doi.org/10.1115/IPC2016-64610
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