Statistical estimation of load-bearing capacity of titanium alloy discs

The results of overspeed tests of titanium alloy model and full-scale discs are presented in the paper. The parameters of static distribution of the discs’ relative strength are determined for the discs destroyed according to the meridian pattern and the cylindrical pattern in samples of model and full-scale structures with and without holes in the casing. It is shown that in samples of model and full-scale discs with or without holes in the body in the case of fracture along the meridian section the average values of relative disc strength are equal, which indicates insignificant influence of the above- mentioned designs and presence of holes on the relative disc strength. In samples of discs with and without holes destroyed according to the cylindrical pattern the average values of relative disc strength are also equal, which testifies to insignificant influence of holes on the relative disc strength. In disc samples destroyed by the meridian pattern and the cylindrical pattern the average values of relative disc strength are not equal, which testifies to significant influence of the fracture pattern on the relative disc strength. The results can be used for predicting margins on the disc break-up rotation frequency.