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    Volume 11, Issue 2 (April 2021)

    Special Issue Paper

    Effect of Specimen Thickness on Threshold Stress Intensity Factor (KIH) Associated with DHC in Zr-2.5 Nb Alloy Pressure Tube Material

    (Received 29 September 2020; accepted 19 January 2021)

    Published Online: 26 April 2021

    CODEN: MPCACD

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    Abstract

    Delayed hydride cracking (DHC) behavior for zirconium alloys is characterized in terms of DHC velocity, VDHC, and Threshold Stress Intensity factor, KIH. The effect of specimen thickness on KIH associated with DHC of unirradiated Zr-2.5 Nb pressure tube material was investigated. For this purpose, KI at crack arrest for 1 mm–, 2 mm–, and 4.5 mm–thick specimens was determined using the load drop technique. Significant tunneling of the crack was observed for 1 mm– and 2 mm–thick specimens in the load drop test at 250°C. The KI at crack arrest was found to be increasing with the decrease in specimen thickness. However, extended finite element model (FEM) simulation revealed that KI at crack arrest in the center of the 1-mm specimen and 2-mm specimen is comparable to the values 9.2 ± 0.5 MPa.m1/2obtained for the 4.5 mm–thick specimen. Hence, if tunneling is not present in the specimen, the KIH was found to be independent of specimen thickness.

    Author Information:

    Sunil, Saurav
    Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Modular Labs, Trombay, Mumbai,

    Bind, A. K.
    Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Modular Labs, Trombay, Mumbai,

    Murty, T. N.
    Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Modular Labs, Trombay, Mumbai,

    Singh, R. N.
    Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Modular Labs, Trombay, Mumbai,

    Avinash, G.
    Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Modular Labs, Trombay, Mumbai,

    Singh, I. V.
    Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand


    Stock #: MPC20200139

    ISSN:2379-1365

    DOI: 10.1520/MPC20200139

    Author
    Title Effect of Specimen Thickness on Threshold Stress Intensity Factor (KIH) Associated with DHC in Zr-2.5 Nb Alloy Pressure Tube Material
    Symposium ,
    Committee B10