Considering the difficulty in calculating the stress concentration factor of mortise of a disk and the error of life is big by using the traditional stress-life method
an improved stress-life method is proposed to compute the life of disks.It includes the concept of stress correction coefficient
a new method to determine the stress concentration factor of mortise of a disk and a new method for correcting the stress ratio.When once the stress correction coefficient of the bars was computed
the improved Stress-Life method can be used to calculate disk's life with the experimental data of bars without notch
at the same time
the influence of the stress concentration is also considered.Then a new stress-life probabilistic model is built for the purpose of life reliability analysis.Finally
the fatigue life reliability of a fan disk is analyzed by the method given
and the computational results fit well with experimental ones.