| METADEX Antwortnummer 18 - © 1998 CSA |
| Title |
| | Non-Destructive Residual Stress Measurement in Railway Wheels, Based on the Magnetochemical Effect. |
| Author |
| | Mutton, P.J. (BHP Research); Langman, R.A. (University of Tasmania) |
| Publication Source |
| | Non-Destructive Testing, Australia (Sept.-Oct. 1991) 28, (5), 130-134, Graphs, 14 ref.
ISSN: 0157-6461 |
| Document Type |
| | Journal |
| Country of Publication |
| | Australia |
| Language |
| | English |
| Abstract |
| | Railway wheels may be overheated during service as a result of severe on-tread braking conditions. Given that it is the probability of detrimental changes to the residual stress distribution, rather than the extent of plate discolouration, which necessities condemning of discoloured wheels, there is a requirement for more reliable inspection techniques and condemning criteria for such wheels, based on non-destructive measurement of the residual stress distribution. The wheel stress device data can be used, at least in a general sense, to classify wheels according to the level of thermal damage. The wheel base device is based on the influence of a uniaxial stress field on the magnetic hysteresis behaviour of ferromagnetic materials. In the presence of such a stress field, a condition of magnetic anisotropy exists, such that differing magnetic responses occur when ferromagnetic material is magnetised either parallel or perpendicular to the direction of applied or residual stress; this is known as the magnetochemical effect. The accuracy with which the residual stress distribution can be determined using the wheel stress device may be influenced by: variations in wheel composition and microstructure; the residual stress distribution in the nearby region being influenced by the machining process; and additional mechanical damage and/or machining may occur to the rim surface during service. |
| Accession Number |
| | 93(1):22-5 |
