Fatigue crack growth of a railway wheel |
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| Affiliation: | 1. Department of Engineering Design and Materials, NTNU, Trondheim, Norway;2. Department of Management and Engineering, University of Padova, Vicenza, Italy;3. Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran;1. University of El Mergib, Faculty of Engineering, Khoms, Libya;2. University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia;3. University of Maribor, Faculty of Mechanical Engineering, Maribor, Slovenia;4. University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia;1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;2. Technical Center of Ma''anshan Steel & Iron Corporation, Ma''anshan 243000, China |
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| Abstract: | Typically, fatigue crack propagation in railway wheels is initiated at some subsurface defect and occurs under mixed mode (I–II) conditions. For a Spanish AVE train wheel, fatigue crack growth characterization of the steel in mode I, mixed mode I–II, and evaluation of crack path starting from an assumed flaw are presented and discussed.Mode I fatigue crack growth rate measurement were performed in compact tension C(T) specimens according to the ASTM E647 standard. Three different load ratios were used, and fatigue crack growth thresholds were determined according to two different procedures. Load shedding and constant maximum stress intensity factor with increasing load ratio R were used for evaluation of fatigue crack growth threshold.To model a crack growth scenario in a railway wheel, mixed mode I–II fatigue crack growth tests were performed using CTS specimens. Fatigue crack growth rates and propagation direction of a crack subjected to mixed mode loading were measured. A finite element analysis was performed in order to obtain the KI and KII values for the tested loading angles. The crack propagation direction for the tested mixed mode loading conditions was experimentally measured and numerically calculated, and the obtained results were then compared in order to validate the used numerical techniques.The modelled crack growth, up to final fracture in the wheel, is consistent with the expectation for the type of initial damage considered. |
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