摘要
A state-of-art review is given to the new advances on fatigue reliability design and analysis methods of Chinese railway vehicle＇s structures. First, the structures are subject to a complicated random fatigue stressing history and this history should be determined by combining dynamic simulation and on-line inspection. Second, the random fatigue constitutions belong to an intrinsic fatigue phenomenon and a probabilistic model is developed to well describe them with two measurements of survival probability and confidence, similar model is also presented for the random stress-life rela- tions and extrapolated appropriately into Song fatigue life regime. Third, concept of the fatigue limit should be understood as the fatigue strength at a given fatigue life and a so-called local Basquin model method is proposed for measuring the random strengths. In addition, drawing and application methods of the Goodman-Smith diagram for integrally characterizing the random fatigue strengths are established in terms of ten kilometers. Fourth, a reliability stress-based method is constructed with a consideration of the random constitutive relations. These new advances form a new frame work for railway fatigue reliability design and analysis.
A state-of-art review is given to the new advances on fatigue reliability design and analysis methods of Chinese railway vehicle＇s structures. First, the structures are subject to a complicated random fatigue stressing history and this history should be determined by combining dynamic simulation and on-line inspection. Second, the random fatigue constitutions belong to an intrinsic fatigue phenomenon and a probabilistic model is developed to well describe them with two measurements of survival probability and confidence, similar model is also presented for the random stress-life rela- tions and extrapolated appropriately into Song fatigue life regime. Third, concept of the fatigue limit should be understood as the fatigue strength at a given fatigue life and a so-called local Basquin model method is proposed for measuring the random strengths. In addition, drawing and application methods of the Goodman-Smith diagram for integrally characterizing the random fatigue strengths are established in terms of ten kilometers. Fourth, a reliability stress-based method is constructed with a consideration of the random constitutive relations. These new advances form a new frame work for railway fatigue reliability design and analysis.
基金
Selected from Proceedings of the 7th International Conference on Frontiers of Design and Manufacturing(ICFDM'2006)
This project is supported by National Natural Science Foundation of China(No.50375130,No.50575189)
Foundation for the Author of National Excellent Doctoral Dissertation of China(No.2002034)
Program for New Century Excellent Talents in University,China(No.040890).
作者简介
ZHAO Yongxiang is currently a professor in Traction Power State Key Laboratory, Southwest Jiaotong University, China. He received his PhD degree in solid mechanics from the above university in 1998. His main research interests include fatigue ＆ fracture of engineering materials and structures; reliability, maintainability, and safety; life cycle engineering, etc. Tel： ＋86-28-87600935; E-mail： yxzhao@home.swjtu.edu.cnPENG Jiachun is currently an MS candidate in Traction Power State Key Laboratory, Southwest Jiaotong University, China. He received his bachelor degree in mechanical design from the above university in 2005. His main research interests include fatigue reliability analysis and finite calculation. Tel： ＋86-28-87600935; E-mail： pjc55@ 163.comYANG Bing is currently a PhD candidate in Traction Power State Key Laboratory, Southwest Jiaotong University, China. He received his bachelor degree in mechanical design from the above university in 2001. His main research inter- ests include fatigue short crack behaviour and reliability analysis. Tel： ＋86-28-87600935; E-mail： yb@home.swjtu.edu.cn
