An assessment of the tensile and fracture toughness data generated in a beryllium irradiation-test program

Experimental data on the ambient and elevated temperature tensile and fract ure toughness properties of unirradiated, thermally aged and neutron irradi ated hot isostatic (HIP) and vacuum hot (VHP) pressed S-65 and S-200F beryl lium grades are assessed with respect to the effects of material, test and irradiation variables. The limitations of the existing data are acknowledge d and the additional investigations required to clarify some of the present uncertainties are summarised.