Fatigue life prediction of modern gas turbomachine blades

The present paper describes fatigue life prediction of blades of modern gas engines taking into account temperature, vibration, centrifugal force and creep effects. Prediction of fatigue life will be performed by two methods in time and frequency domain. Change of dynamic stresses emerging in a blade as a result of vibration, centrifugal force and temperature change in the process of engine operation will be analyzed by finite element method. Boundary conditions of temperature change on blade's length and chord for the tasks of thermal conductivity and stresseswere received based on results of experiments in some points of a blade using the method of spline interpolation. Stresses will be determined subject to measurement of rotor acceleration and use of standard scheme of blade load that includes processes of engine start, stationary operation and stoppage. Furthermore, the destruction of a blade due to creepage will be described in the paper with the help of linear independent methods. © 2011 Taylor & Francis Group, London.