Crack Growth Behavior in Overloaded Specimens with Sharp Notch in Low Carbon Steel

    Volume 35, Issue 5 (September 2007)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 30 April 2007

    Page Count: 6


    Purnowidodo, Anindito
    Lecturer, Mechanical Engineering Department, Brawijaya University, JI. MT. Halang, East Java

    Fukuzato, Shingo
    Technician, Okinawa Electric Power Co., Urasoe-city, Okinawa

    Saimoto, Akihide
    Associate Professor, Graduate School of Science and Technology, Nagasaki University, Nagasaki-city, Nagasaki

    Makabe, Chobin
    Professor, Department of Mechanical and Systems Engineering, University of the Ryukyus, Okinawa

    (Received 13 June 2005; accepted 15 February 2007)

    Abstract

    The purpose of the present study is to evaluate fatigue crack propagation after tensile overloading. A 6-mm long u-shaped notch was cut in the center section of the specimen. Notch root radii of 0.1, 1, and 2 mm were chosen for ρ. These were regarded as center-notched specimens. The crack propagation behavior of these specimens was compared with a center-cracked specimen. Push-pull fatigue tests were carried out under stress ratios R=0, −1, and −1.5. A special investigation was made into the results for ρ=1 mm. After overload, retardation of crack growth was observed under R=0 and −1 for the notched specimens and center-cracked specimens. However, where R=−1.5, crack growth acceleration was observed after overload in both types of specimens. Even though crack growth was accelerated or decelerated, the rate was able to be evaluated by the effective stress intensity factor range after 0.2 mm of crack growth from the notch root.


    Paper ID: JTE100097

    DOI: 10.1520/JTE100097

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    Title Crack Growth Behavior in Overloaded Specimens with Sharp Notch in Low Carbon Steel
    Symposium , 0000-00-00
    Committee A01