The method of estimating the fatigue life of the low pressure turbine shaft structure made of continuous fiber reinforced composite material under given low cycle loading was studied. Structural characteristics of continuous fiber reinforced composites were considered

low cycle fatigue life prediction method based on the local stress strain theory was studied

and the efficiency of the method was proved. A certain type of low pressure turbine shaft of the engine was selected for reference

the maximum stress

strain and fatigue life were calculated with the method. Result showed that

the fatigue life value of the 45° angle of composites layer was the biggest within the scope of the 0°-90°; when the thickness of the metal remained unchanged

the composite material fatigue life of outer metal and the first layer increased with the increasing thickness of the composites; when the shaft wall thickness was 6 mm

if reducing the thickness of the composites layer

and increasing the inner or the outer metal coating thickness

the structure fatigue life decreased as composites layer thickness decreased; the life of the outer metal coating was longer than the fatigue life of the first layers composite materials.