ABSTRACT
In modern gas turbo machines in order to increase efficiency, specific impulse as well as a number of other key parameters of an engine, gas temperature in front of a turbine is being continuously increased. To ensure reliable performance of a turbo machine it is necessary to develop estimation methods of reliability and durability of blades that function under heavy-load conditions and are subject to effects of gas loads, centrifugal forces, vibration, thermal fatigue, creep, various kinds of corrosion and erosion and other factors. 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. Furthermore, the destruction of a blade due to creepage will be described in the paper with the help of linearly independent methods. The above mentioned problems are solved by the program developed in Fortran language at Irkutsk State Technical University (Russia).
