Research on Fatigue Life Prediction of Mechanical Components under Random Vibration Load
A research method for predicting the fatigue life of mechanical components under random vibration loads is proposed to address the issue of low prediction accuracy.The fatigue analysis of mechani-cal parts under random vibration load is carried out.According to the stress/strain response of mechanical parts,the stress power spectral density function of the fatigue part of mechanical parts within a certain range is obtained.Based on the cumulative damage theory and S-N curve,the fatigue life of mechanical components under random vibration loads is further estimated,and the research on predicting the life of mechanical components is achieved.The experimental results show that the stress power spectral density of this method is consistent with the actual results,and the fatigue life prediction results of mechanical parts under different amplitudes and preloads are relatively accurate,which verifies the high reliability of this method.
random vibration loadmechanical partsfatigue life predictionS-N curve
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