Abstract
Rolling contact fatigue (RCF) cracks are threatening to the security of railway rails. Alternating current field measurement (ACFM) is an electromagnetic non-destructive method for RCF cracks detecting and the sizing algorithm has been developed for single and uniform arranged RCF cracks. However, non-uniform cracks with different propagation angles, e.g. intersecting and bifurcating cracks, are difficult to be identified and characterized using the algorithm. In this paper, modelling of ACFM responses on non-uniform RCF cracks are discussed. A novel ACFM By signal and the method for identifying intersecting and bifurcating cracks are proposed. Results show that By signal is more beneficial to detect complex arranged RCF cracks and is more sensitive to variations of intersecting/bifurcating angles and positions than conventional Bx and Bz signals. By signal is promising for sizing intersecting/bifurcating RCF cracks and responses of By signals can contribute to the establishment of sizing algorithm for complex arranged RCF cracks.
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