Calcultion for Fatigue Damage and Fatigue Life of Metro Bogie Based on Dynamic Stress

doi:10.3901/JME.2022.04.183

Abstract

Abstract: As the key structure of the running gear of rail vehicles, the service safety of bogie frame has received great attention. Therefore, the newly designed bogie frame sample of metro vehicle is taken as the research object, and the fatigue damage and fatigue life are studied based on its dynamic stress in service. Combined with the vehicle running state data, the damage distribution characteristics of the bogie’s key parts are studied, the reasons for the rapid accumulation of fatigue damage are also analyzed. For the key parts of the bogie frame sample: the crack initiation life is calculated; the kernel density of stress amplitude distribution is estimated, which is based on the stress amplitude samples after rain flow counting; the crack propagation model is established; and by the use of Monte Carlo method and inverse function method, the cumulative failure probability under different operating mileage is calculated. The results show that the cumulative failure probability of the bogie frame increases rapidly with the increase of operating mileage, and the operating mileage corresponding to 97.5% reliability is 30,000 km after crack initiation; the fatigue life of the frame is the sum of crack initiation life and propagation life, and it is 483 900 km under 97.5% reliability. The research results provide a research basis for further improving the anti fatigue performance of the frame and optimizing the maintenance cycle of the bogie.

Key words: metro bogie frame, dynamic stress, fatigue damage, fatigue life

CLC Number:

U270

XIE Shuqiang, WANG Binjie, WANG Wenjing, ZHANG Haonan, LI Qiang, JIANG Chaoyong. Calcultion for Fatigue Damage and Fatigue Life of Metro Bogie Based on Dynamic Stress[J]. Journal of Mechanical Engineering, 2022, 58(4): 183-190.

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