COMPARISON OF J-RESISTANCE MEASUREMENT METHODS ON CLAMPED SINGLE-EDGE NOTCHED TENSION SPECIMENS

Published

November 10, 2016

Author(s)

Timothy Weeks, David T. Read, Enrico Lucon, Jeffrey W. Sowards, Ross Rentz

Abstract

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. In that study, the strain data were obtained by use of traditional surface-mounted strain gage instrumentation. Here, the surface strain gradients are measured by three-dimensional digital image correlation. Digital image correlation is a mature technique gaining popularity due to its relatively low cost and ease of use. More importantly, digital image correlation affords high fidelity data sets over large areas of interest and significantly higher strain capability compared to traditional instrumentation. The results herein represent a small test matrix that involved interrogation 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. A series of validity checks are presented that demonstrate that the data are useful and valuable.

Proceedings Title

Proceedings of the 11th International Pipeline Conference

Conference Dates

September 25-30, 2016

Conference Location

Calgary, CA

Conference Title

International Pipeline Conference

Pub Type

Conferences

Download Paper

https://doi.org/10.1115/IPC2016-64610

Local Download

Citation

Weeks, T. , Read, D. , Lucon, E. , Sowards, J. and Rentz, R. (2016), COMPARISON OF J-RESISTANCE MEASUREMENT METHODS ON CLAMPED SINGLE-EDGE NOTCHED TENSION SPECIMENS, Proceedings of the 11th International Pipeline Conference, Calgary, CA, [online], https://doi.org/10.1115/IPC2016-64610, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=920416 (Accessed October 9, 2025)