Durability of rolling stock elements under cyclic loading

As a result of lasting operation of the undercarriages of traction rolling stock (frame and body, their pivot assemblies, bogie frames, axles of wheel pairs, etc.) under alternating cyclic loads, the strength properties of the metal parts degrade, their fatigue resistance declines, which may eventually cause the structure’s destruction. Therefore, the strength of the structures of locomotives and wagons is to be validated not only through safety margins as per the current regulations, but also through durability (life) predictions for such structures with predefined levels (dependability). Aim. To improve the conventional approaches to assessing and ensuring safe operation of rolling stock. Method. The life of structural elements is estimated using computations and experiments involving methods developed by the Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN) adapted to the structures of railway rolling stock given the existing experience of their operation and using the data collected by VNIKTI. Results. Calculations of the durability and life of critical items, definition of the acceptable level of risk of locomotive operation. Conclusion. A risk-based approach helps improve railway traffic safety.