European Certification of Charpy Specimens: Reasoning and Observations
The procedure for the production and certification of BCR Charpy specimens of machine verification according to the European Standard EN 10045-2 are described. A master batch is initially certified by interlaboratory comparison and is then used as a reference to certify sub-batches to similar impact toughness by comparative measurements on one dedicated machine. Extensive testing over ten years has shown that, for SAE 4340 steel, a 2mm striker generally produces higher impact toughness than a 8mm striker up to 120 J absorbed energy. Another observation is that asymmetric fracture generally occurs in about 50% of all cases, but that small series of tests may produce nearly all asymmetric or symmetric failures, influencing the mean value of the measured impact toughness.
Bibliographic Reference: Paper presented: Pendulum Impact testing - A century of Progress, Seattle (US), 19-20th May (1999)
Availability: Available from Public Relations and Publications Unit, Ispra (IT)
Record Number: 199911155 / Last updated on: 1999-08-19
Original language: en
Available languages: en