NON-DESTRUCTIVE DETERMINATION OF MAGNETIC PERMEABILITY TENSOR IN MATERIALS OF ARBITRARY SHAPE

摘要

A method of non-destructive determination of a local magnetic permeabilitytensor of amaterial comprises testing by X-ray diffraction on a first surface to identifyand measure anysurface stress in the material; performing a calibration test usingmagnetostriction to identifyany effect of any determined stress; subjecting the material to a magneticfield having astrength H and measuring a field of induction B on the surface at the selectedlocation andrepeating this step by using gradual increases of H until a saturated value isdetermined for B.to determine a distribution of magnetic domains at the selected location;repeating thedeterminations of saturated values for B at additional locations on eachselected surface of thematerial; and using the saturated values and distribution of magnetic domainsto derive themagnetic permeability tensor. The non-destructive method provides increasedaccuracy forstressed or unstressed materials of arbitrary shape.