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    Revisit of ASTM Round-Robin Test Data for Determining R Curves of Thin-Sheet Materials

    Published: 01 January 2011

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    This paper revisits the ASTM round-robin fracture test data obtained in 1979–1980 by ASTM Task Group E24.06.02 on Application of Fracture Analysis Methods. The fracture tests were conducted using thin-sheet compact tension [C(T)] specimens made of three materials—7075-T561 aluminum alloy, 2024-T351 aluminum alloy, and 304 stainless steel—and different specimen widths were employed in order to take account of in-plane specimen size effect on fracture toughness. Typical experimental data are reanalyzed, and crack growth resistance curves are developed in accordance with fracture test standards, ASTM E561-05 and ASTM E1820-08. Several useful results as well as the conditions under which the two standards can equivalenty determine a geometry-independent resistance curve are obtained for the thin-sheet C(T) specimens.


    fracture toughness, R, curve, ductile crack growth, thin sheet, ASTM E561-05, ASTM E1820-08

    Author Information:

    Zhu, Xian-Kui
    Senior Research Scientist, Battelle Memorial Institute, Columbus, OH

    Leis, Brian N.
    Senior Research Leader, Battelle Memorial Institute, Columbus, OH

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP49284S