STP1380: European Certification of Charpy Specimens: Reasoning and Observations

    Pauwels, J
    EC-JRC-IRMM, Geel, Retieseweg

    Gyppaz, D
    Cogne Acciai Speciali, Aosta,

    Varma, R
    National Physical Laboratory (NPL), Teddington, Middlesex

    Ingelbrecht, C
    EC-JRC-IRMM, Geel, Retieseweg

    Pages: 10    Published: Jan 2000


    Abstract

    The procedure for the production and certification of BCR (Bureau Communautaire de Reference) Charpy specimens for machine verification according to the European standard EN 10045-2 is described. A master batch is initially certified by interlaboratory comparison and is then used as a reference to certify sub-batches of similar impact toughness by comparative measurements on one dedicated machine. Extensive testing over ten years has shown that, for SAE 4340 steel, a 2 mm striker generally produces higher impact toughness than an 8 mm 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 symmetric or nearly all asymmetric failures, influencing the mean value of the measured impact toughness.

    Keywords:

    Charpy V-notch, standardisation, asymmetric fracture, European certification


    Paper ID: STP14388S

    Committee/Subcommittee: E28.07

    DOI: 10.1520/STP14388S


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