Vibration fatigue characteristic study of aeroengine composite blade was carried out.Firstly,the vibration diagrams of blade were obtained by modal tests,based on which,the position of the largest stress-fatigue weak position of vibrated blade was determined.Secondly,using vibration table,the narrowband random excitation load was applied to monitor the strain level at the fatigue weak position.Based on which,the vibration response and fatigue characteristics of composite blade were obtained.Experimental res...