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    STP1418

    RESQUE: Determination of the Lowest Acceptable Insert Length for Reconstituted Cv-impact and Precracked Cv Specimen

    Published: 0


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    Abstract

    One of the tasks within the framework of the EU “RESQUE”- project was to determine the lowest acceptable insert length for reconstituted Charpy V impact (Cv) and pre-cracked Charpy V (PC Cv) specimens. In order to obtain an optimized insert length, Cv impact specimens with three insert lengths ranging from 10 to 20 mm and fracture toughness PC Cv specimens with two different insert lengths of a reference material were manufactured by stud-welding or electron-beam welding and tested under various test conditions. Cv tests on reconstituted specimens exhibited the normal scatter in Charpy energies and that there was no significant influence of the insert length on the transition temperatures. However, the 10 mm insert caused a reduction in the upper shelf energy of 10–15%. The fracture toughness tests carried out in the transition regime showed that the 10 mm insert resulted in a lower estimate (non-conservative) of T0 compared with the values measured on 12mm insert and baseline specimens. It is therefore recommended that at least 12 mm long inserts should be used for fracture toughness testing in the transition region. In the ductile region a trend to lower initiation toughness values at higher temperatures was observed. To avoid this, 20 mm long inserts should be used for J-Δa curves at higher temperatures.

    Keywords:

    reconstitution technique, Charpy testing, pre-cracked Charpy, T, 0, determination, insert length, fracture resistance


    Author Information:

    Keim, E
    Siemens, Erlangen,

    Langer, R
    Siemens, Erlangen,

    van Walle, E
    SCK•CEN, Mol,

    Scibetta, M
    SCK•CEN, Mol,

    Valo, MJ
    VTT Manufacturing Technology, Espoo,

    Viehrig, H-W
    Research Center Rossendorf Inc., Dresden,

    Richter, H
    Research Center Rossendorf Inc., Dresden,

    Atkins, T
    AEA Technology, Harwell,

    Wootton, MR
    BNFL Magnox Generation, Berkeley,

    Debarberis, L
    JRC/IAM, Petten,

    Horsten, M
    NRG, Petten,


    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP10836S