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    A Study of Specimen Size Effects on the Initiation Toughness and Tearing Resistance of an A533B-1 Steel


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    This paper provides comparison of initiation toughness values and JR curve data for a series of geometrically scaled compact (CT) and single edge notched bend (SENB) geometry specimens taken from a well characterized A533B-1 pressure vessel steel. The CT specimens (W = 2B) were of thickness B = 100, 40, 20, 15, 12.5 & 10 mm, and SENB specimens (W = 2B and W = B) of B = 20, 10 & 5 mm. The data reported are multi-specimen J-Δa values obtained from a total in excess of 400 tests made at ambient temperature (20°C) and 288°C on both plain-sided and sidegrooved specimens. The findings of the work indicate that for the material under study there is little effect of specimen size or geometry on the initiation toughness for a given level of sidegrooving. It also indicates that small size specimens (i.e., W = 10, B = 5mm) can provide JR curve data equivalent to those obtained for the larger specimens for levels of J up to 600kJm-2 and crack extension Δa up to approximately 25% of their initial remaining ligament (40% for 20% side grooved specimens). Suggestions are made to relax the current specimen size validity limits. The results presented here encourage the use of SENB specimens possibly as small as 5 × 5 mm for the determination of initiation toughness in these materials


    Size, initiation toughness, J, 0.2, J, 0.2BL, tearing resistance, J, R, steel, A533B, compact (CT), single-edge notched bend (SENB)

    Author Information:

    Wardle, G
    Consultant Technologist, Serco Assurance, Warrington, Cheshire

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP10813S