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High-speed inspection of rolling contact fatigue in rails using ACFM sensors

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High-speed ACFM tests were carried out using a rotary test-piece that contained spark-eroded notches. The ACFM sensor detected the induced notches at 121.5 km/h while the recorded signal intensity remained largely unaffected by the increases in speed under constant lift-off. To simulate actual rail inspection conditions at high speed, further tests were carried out using a spinning rail rig and a set of rails that contained spark-eroded notches of various shapes and sizes up to a speed of 48 km/h. The ACFM sensor successfully detected the artificially-induced notches, however the signal was affected by severe lift-off variations that occurred during testing.
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Document Type: Research Article

Affiliations: 1 Rail Research UK Centre, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.

Publication date: July 1, 2009

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