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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.
fracture toughness, irradiated beryllium, porous beryllium, fatigue precracking, irradiation defects, valid , K, Ic
Senior scientist, EG&G Idaho, Inc., Idaho Falls,