An Equivalent and Accelerated Life Test Method for Compressor Blades under Combined Loads Based on Equal Fatigue Life

Considering combined loads due to centrifugal forces, aerodynamics, temperature and acoustics, the paper presents a method to establish and simplify the load spectrum of compressor blades based on the actual loads of aero-engines, and puts forward an equivalent method to convert centrifugal and aerodynamic loads into a vibration load with an equal fatigue life using the linear superposition principle and the average stress correction equation, and presents a calculation method of the acceleration factor, and designs a test rig to simulate the equivalent thermo-acoustic-vibration load. Thus, an accelerated life test method is provided to evaluate the serving life of blades.