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Fatigue Life Prediction of the Metro Bolster Beam under Complex Operating Conditions

Fatigue Life Prediction of the Metro Bolster Beam under Complex Operating Conditions
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摘要 Sixteen operating conditions were determined by the standards JIS-7105 and JIS-7106. The strength under complex operating conditions was calculated with HyperWorks and the strength analysis confirmed eight dangerous points of the metro bolster beam. Since the metro did not consider the impact of traffic lights and sudden road conditions, the load spectra at eight dangerous points were established by counting the running time,passenger flow,site layout,site quantity and turning situations. The fatigue life of the metro bolster beam was projected by the von Mises stress method and the critical plane method. The results of these two methods revealed that the maximum damage occurred at the dangerous point 7,and the fatigue life based on the critical plane method was shorter than that based on the von Mises stress method.Since the McDiarmid model considered the effect of the magnitude and direction of the normal stress and the amplitude of the shear stress,it is closer to the actual situations of the metro. Hence,the McDiarmid model based on the critical plane method is more reasonable,and the method of fatigue life prediction is also suitable to the metro bolster beam of other lines. Sixteen operating conditions were determined by the standards JIS-7105 and JIS-7106. The strength under complex operating conditions was calculated with HyperWorks and the strength analysis confirmed eight dangerous points of the metro bolster beam. Since the metro did not consider the impact of traffic lights and sudden road conditions, the load spectra at eight dangerous points were established by counting the running time,passenger flow,site layout,site quantity and turning situations. The fatigue life of the metro bolster beam was projected by the von Mises stress method and the critical plane method. The results of these two methods revealed that the maximum damage occurred at the dangerous point 7,and the fatigue life based on the critical plane method was shorter than that based on the von Mises stress method.Since the McDiarmid model considered the effect of the magnitude and direction of the normal stress and the amplitude of the shear stress,it is closer to the actual situations of the metro. Hence,the McDiarmid model based on the critical plane method is more reasonable,and the method of fatigue life prediction is also suitable to the metro bolster beam of other lines.
作者 YIN Gangqiang WANG Lei LUO Yuhui 尹刚强;王雷;罗宇辉(School of Mechanical Engineering and Automation,Northeastern University)
出处 《Journal of Donghua University(English Edition)》 EI CAS 2018年第2期118-123,共6页 东华大学学报(英文版)
基金 National Key Technology Research and Development Program of China(No.2014BAF08B01) Collaborative Innovation Center of Major Machine Manufacturing in Liaoning,China
关键词 BOLSTER BEAM COMPLEX operating conditions strengthanalysis FATIGUE LIFE bolster beam complex operating conditions strengthanalysis fatigue life
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