Abstract
Railway mechanical components are subject to thousands of fatigue cycles. Fatigue damage and life assessment is still an open issue. Under service multiaxial loading conditions several challenges can arise. In this study an evaluation of a railway wheel material is performed, i.e. the material properties and the working conditions are taking into account and evaluated. Different mechanical tests are carried out, namely fatigue tests under uniaxial (LCF+HCF) and biaxial (HCF) conditions, applied to several specimens made from the railway wheel. Multiaxial fatigue models were considered regarding the fatigue life estimation. Moreover, fatigue crack plane measurements were compared with estimations from several critical plane models. The applied models provided very satisfactory results, regarding the fatigue life estimation and the initial crack initiation plane under the multiaxial loadings conditions.
Highlights
Fatigue studies are of the utmost importance for any system subjected to dynamic loadings
These results show the effect of the loading path and stress level on the material fatigue strength
The material of a used railway wheel was tested in lab in order to study its fatigue behavior under different loading paths
Summary
Fatigue studies are of the utmost importance for any system subjected to dynamic loadings. This type of failure is one of the most common and unpredictable and may happen in any range from low to very high number of cycles [1]. Acknowledging the material fatigue resistance provides a more reliable and secure mechanical system, structure or component. Several fatigue tests may be produced depending on the type of loading and on the number of cycles of interest. When structural and machine components are working, they are subjected to multiaxial stress states mainly due to geometric form and/or complex loading. The lifetime estimation due to the fatigue of these components is extremely important [3], once it is related to safety operating conditions
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