Progresses on the Fatigue Reliability Research of China Railway Vehicles in Recent Decade

Zhi Yun Shen; Yong Xiang Zhao; Bing Yang; Wei Hua Zhang

doi:10.4028/www.scientific.net/AMR.44-46.1

Paper Titles

Committees

Preface

Progresses on the Fatigue Reliability Research of China Railway Vehicles in Recent Decade
p.1

Learning from History: The Reliability of Experts and Expert Systems
p.15

Some Fundamental Aspects of Redesign and Remanufacture of High Temperature Components
p.25

Effect of Non-Metallic Inclusion Size and Residual Stresses on Gigacycle Fatigue Properties in High Strength Steel
p.33

The Analysis on the Low Cycle Fatigue Behavior of a Directionally Solidified Superalloy with Recrystallized Surface Layers
p.43

A Statistically Load-Weighted Probabilistic Fatigue Life Model
p.51

Determination of the Probabilistic Fatigue S-N Curves Including Super-Long Life Regime for a Railway Axle Steel
p.57

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Progresses on the Fatigue Reliability Research of China Railway Vehicles in Recent Decade

Abstract:

Main progresses are reviewed and prospected from four elements on the fatigue reliability analysis research of China railway vehicles during recent decade. First, material fatigue database has been moderately developed and an emphasis was placed on the systemized fatigue properties. Second, a great of on-line inspections have been performed on the wheel-track contact forces and service stresses of key structures. A reliable vehicle dynamics simulation technique has been developed for simulating the contact forces and a multi-variable quadratic regression approach has been proposed to calculate the service stresses for recuing imperfect inspections. Third, systemized fatigue reliability researches have been made on improved fatigue limit measurement, probabilistic S-N curves, scale-deduced fatigue behavior, design Goodman-Smith diagram, and reliability analysis approach to address on the real super-long life of railway vehicle’s structures. Fourth, a critical safety state theory is established to address the time-dependent off-round wheel wear and the interactive fatigue damage between components. Fatigue cracking threshold measurement is improved. And a fatigue crack growth modeling is developed to cover entire physical process from the threshold to the fracture. The axle critical safety sizes are determined under considering the off-round wheel and the wheel critical safety wear sizes are measured to ensure the axle expected safety life. All researches are valuable to be further studied.