Structure analysis and life evaluation of the pin holes in a turbine disc of a type of aero-engine

The stress and strain distribution at the radial pin holes in a turbine disc of an aero-engine was analyzed using finite element analysis(FEA) method.The influence of some factors on the stress distribution adjacent the pin hole was discussed,such as the numbers of the pins,the friction coefficient between hole and pin,the presentation of torque on the disc.The analysis revealed the difference between earlier test and actual operation.The fatigue life was estimated with the formula of strain energy and the predicting life tallied well with the test.The results demonstrate that turbine disk fatigue test with torque is necessary,providing a mechanical foundation for the life extension of the high pressure turbine discs.