Abstract
This paper describes a newly found non-destructive testing technique for residual stress measurements, which is called magnetomechanical acoustic emission (MAE). It applies to ferromagnetic materials only, but has a greater depth of penetration than other common methods of residual stress analysis, such as X-ray diffraction and acoustic surface wave. Previous studies on MAE are reviewed, in which effects of metallurgical and magnetic parameters on MAE were evaluated. Our recent study has correlated magnetic properties of nickel and iron to MAE characteristics. Some of the observed features of MAe can be explained in terms of the domain theory, but many unresolved questions remain. Practical applications must await further developmental efforts, but some preliminary results of residual stress analysis for a welded steel plate and others are presented.
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