Abstract
A nondestructive inspection technique, based on stress-induced magnetic anisotropy, provides a means of quantifying the residual stress distribution in railway wheels. An automatic prototype device has been constructed; calibration measurements were carried out to examine the sensitivity of the technique to metallurgical effects in the wheel grades of interest. The device was used to obtain residual stress information on new and thermally damaged wheels representing a range of service conditions. The validity of the technique is examined using additional strain gauge measurements. A relationship is established between the output of the device and net circumferential stress within the wheel rim.
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