Code of Practice: Small Punch Testing of reference material BCR-661 (Nimonic 75)
Open Access to JRC Research Infrastructures; 2020-1-RD-EMMA-SMPA, SPT-INVEST
One of the main aims of SPT-INVEST project was to assess the reference material BCR-661 (Nimonic 75) in greater detail with the aim of clarify if the reference material that is by the standards for uniaxial tensile testing (ISO 6892, Part 1), would also be suitable for the small punch test (EN-10371). The test results and assessment reported here clearly indicates that for room temperature testing the material shows great potential. However, this report also shows that special attention has to be given to laboratory specific test set-up differences, e.g. puncher, receiving hole and chamfer actual dimensions. For proof strength estimation the chosen methodology for extracting the representative Fe forces have clearly different correlation coefficients. For the tensile strength estimations by correlation to the classical maximum force (Fm) over the location of the maximum displacement vm or deflection um, also result in uncertainties regarding the correlation constant due to potential differences in friction and as will be shown the actual specimen thickness. This repot gives the estimated friction coefficient for the JRC test lab specific test set-up, and reports the correlation coefficients to be used for tensile strength and proof stress for this material. The discussion part includes some recommendations for a future round-robin exercise.
HOLMSTRÖM Stefan;
BRYNK Thomas;
SIMONOVSKI Igor;
BARALDI Daniele;
2024-10-24
Publications Office of the European Union
JRC137398
978-92-68-15570-7 (online),
1831-9424 (online),
EUR 31931 EN,
OP KJ-NA-31-931-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC137398,
10.2760/77274 (online),
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