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Assessment of Different Approaches for Measuring Shear Fracture Appearance in Charpy Tests



Enrico Lucon, May Ling Martin, Brooke Calvo, Xiang Chen, Mikhail Sokolov


Different approaches for establishing Shear Fracture Appearance (SFA) on tested Charpy specimens were assessed and compared, namely (in order of increasing expected accuracy): estimates based on characteristic forces from instrumented Charpy tests, optical measurements using image analysis software, and measurements performed with the aid of a Scanning Electron Microscope. Comparisons between different SFA values for 129 instrumented Charpy tests currently included in the NIST database allowed us to establish the relationships between the different available approaches and formulate recommendations for the revision of the ASTM E2298 and ISO 14556 standards, which currently provide four empirical correlations that can be used to estimate SFA.
ASTM Journal of Testing and Evaluation


ASTM E2298, image analysis software, instrumented Charpy testing, ISO 14556, Scanning Electron Microscope, Shear Fracture Appearance


Lucon, E. , Martin, M. , Calvo, B. , Chen, X. and Sokolov, M. (2023), Assessment of Different Approaches for Measuring Shear Fracture Appearance in Charpy Tests, ASTM Journal of Testing and Evaluation, [online],, (Accessed June 12, 2024)


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Created March 23, 2023, Updated April 10, 2023