Composite loading fatigue life prediction method and device and readable storage medium

The invention relates to a combined loading fatigue life prediction method and device and a readable storage medium, and the method comprises the following steps: carrying out the correction of combined loading fatigue damage based on a linear cumulative damage model, and correcting the combined loading fatigue damage into the sum of low-cycle fatigue damage, high-cycle fatigue damage and coupling damage; establishing a relation between the coupling damage and the low-cycle fatigue damage, and introducing a coupling damage coefficient K to express the relation between the coupling damage and the low-cycle fatigue damage; obtaining an expression of coupling damage based on the composite loading load characteristic parameter, the high-cycle fatigue life and the low-cycle fatigue life; and based on the obtained coupling damage expression, establishing a composite loading fatigue life prediction model considering the load interaction, and predicting the high-low cycle composite loading fatigue life of the engine