STP683: Fracture Toughness of Irradiated Beryllium

    Beeston, JM
    Senior scientist, EG&G Idaho, Inc., Idaho Falls,

    Pages: 17    Published: Jan 1979


    Abstract

    The fracture toughness of nuclear-grade hot-pressed beryllium after irradiation to fluences of 3.5 to 5.0 × 1021 neutrons (n)/cm2 (E > 1 MeV) was determined. Procedures and data relating to a round-robin test contributing to a standard ASTM method for unirradiated beryllium are discussed in connection with the testing of irradiated specimens. A porous grade of beryllium was also irradiated and tested, thereby enabling some discrimination between the models for describing the fracture toughness behavior of porous beryllium. The fracture toughness of unirradiated 2 percent beryllium-oxygen nuclear-grade beryllium was 12.0 MPa m1/2, which was reduced 60 percent upon irradiation at 339 K and testing at 295 K. The fracture toughness of a porous grade of beryllium was 13.1 MPa m1/2, which was reduced 68 percent upon irradiation and testing at the same conditions. Reasons for the reduction in fracture toughness upon irradiation are discussed.

    Keywords:

    fracture toughness, irradiated beryllium, porous beryllium, fatigue precracking, irradiation defects, valid , K, Ic


    Paper ID: STP38173S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP38173S


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