A new kind of reliability analysis method in coupled case of high-cycle fatigue and low-cycle fatigue

To overcome the limitation of traditional reliability analysis methods in coupled cases of high-cycle fatigue and low-cycle fatigue and accurately analyze the stochastic fatigue reliability of component, a new kind of method decoupling method for high-cycle fatigue and low-cycle fatigue is firstly put forward. The stress and strain spectrums are corrected and classified. As for high-cycle fatigue, probability fatigue accumulation damage theory and nominal stress method are combined. As for low-cycle fatigue, random response surface method is adopted to fit the life distribution function, probability fatigue accumulation damage theory and local stress and strain method are combined to obtain the high-cycle and low-cycle stochastic fatigue reliability. Composite damage of high-cycle and low-cycle is analyzed based on probability fatigue accumulation damage theory to achieve the stochastic fatigue reliability of torsion shaft of complicated equipment.