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This paper on rolling contact fatigue crack growth in rails is from the proceedings of the 12th International Conference on Computer System Design and Operation in Railways and Other Transit Systems, held in Beijing, China, in 2010. The two main requirements for railway replacement are wear and rolling contact fatigue. The authors describe a method to model the cracks in rails; the model incorporates the contact between the crack faces during calculation of the Stress Intensity Factors (SIFs). This data is then combined with the SIFs caused by contact loading to provide a more realistic simulation of the crack growth. The methodology can be applied in different ways, for example, using point loads to represent non-conforming contact to obtain the interaction between the wheel and the rail. The process of the wheel rolling over the crack can be modeled by moving the so called ‘contact patch’ along the rail. Various conditions can be applied to the crack, including frictionless contact between opposing surfaces, or frictional contact. In addition, pressure can be applied to the crack surfaces to take into account the water trapped inside the crack as the wheel rolls over. The paper includes an example that illustrates the advantages of the improved model; a UIC60 rail is modeled with the boundary element method. The authors conclude that these new techniques both simplify the modeling process and also improve the accuracy of the results.

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