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    Volume 45, Issue 4 (July 2017)

    Cost-Effective Precracking of Charpy V-Notch Specimens for Fracture-Toughness Testing Using a Piezoelectric Actuator

    (Received 9 February 2015; accepted 16 June 2016)

    Published Online: 2016

    CODEN: JTEVAB

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    Abstract

    The evolution in the ASTM standards toward more stringent precracking requirements and the large amount of fracture-toughness tests annually performed at SCK•CEN, were the motivations to search for novel techniques to gain more control over the precracking process and to reduce the precracking cost. A piezoelectric actuator was identified as an excellent candidate for this purpose. A dedicated precracking device for Charpy V-notch specimens based on a piezoelectric actuator was developed. The high degree of automation allows full control over the precracking process in agreement with current or future standards. The low power consumption, high precracking frequency, low maintenance, and minimum operator intervention significantly reduce the precracking cost. A second piezo-precracking device was installed in a hot cell. An extensive validation demonstrated that the SCK•CEN Piezomatic is capable of producing a fatigue crack in Charpy V-notch specimens (standard, reconstituted, miniaturized, irradiated) in a fast, controllable, and accurate way. Both machines have been providing a reliable service for several years.


    Author Information:

    Schuurmans, J.
    SCK•CEN (The Belgian Nuclear Research Centre), Inst. Nuclear Material Science – Structural Materials, Mol,

    Scibetta, M.
    SCK•CEN (The Belgian Nuclear Research Centre), Institute Nuclear Material Science – Structural Materials, Mol,


    Stock #: JTE20150050

    ISSN:0090-3973

    DOI: 10.1520/JTE20150050

    Author
    Title Cost-Effective Precracking of Charpy V-Notch Specimens for Fracture-Toughness Testing Using a Piezoelectric Actuator
    Symposium ,
    Committee E08