Abstract
A technique to measure surface stress (strain) in non-magnetic material using the magnetostrictic effect of magnetic foil and film was developed. It is called the magnetic foil and film method. The foil is adhered and the film is sputtered or electroplated. In the present experiment, Ni is used. Apparent magnetic permeability μa of the foil and film is monitored by highly sensitive magnetic permeability meter. The measured μa decreases monotonically with increasing stress σ. It is concluded that the technique can be used for stress (strain) measurement in nonmagnetic materials. A rotating bending fatigue test showed also that cyclic stress causes the decrease ofμa of the foil. The method could also be used for cyclic stress measurement.
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