فرسودگی قسمت بحرانی محور عقب
Abstract
1-Introduction
2-Case study description
3-Results
4-Conclusions
Acknowledgements
References
Abstract
The paper describes the application of probability approach when assessing fatigue life of structures. The case study includes an assessment of two components of the rear axle of the trolleybus. The predicted fatigue life distribution functions were compared with service data. The calculations helped to identify and prevent fatigue cracks and fractures.
Introduction
The methodology, which has been successfully applied for many years in the development of Skoda trolleybuses and buses, has been presented in the literature in the past [1] and recently [2]. This methodology is now being developed in connection with the production of battery buses [3]. In cooperation with RTI (research center of University of West Bohemia, Pilsen, Czech Republic) the following R&D areas of the former company’s methodology are being improved: multibody simulation, FEM calculations, vehicle tests and their parts on electrohydraulic loading device, stress measurement during vehicle running on test and real roads, computational prediction of service fatigue life of important construction nodes and vehicle components, crash computation and experiments. Fatigue cracks (and fractures) occurred only sporadically. If they occurred, identifying their causes and eliminating their further occurrences were the lessons for designers and specialists dealing with the fatigue life of components. The presented case study is an example of a situation that has been resolved using commercial software (nCode) and parametric fatigue life calculations.