The Barkhausen Effect and its Applications to Nondestructive Evaluation

摘要

Measurement of the Barkhausen effect has been developed into a useful approach for the nondestructive evaluation of magnetic materials. Most of the effort has been directed toward applications involving residual stress measurement, however, research in recent years has also demonstrated the applicability of the method for the nondestructive measurement of a variety of material properties, such as grain size and orientation, defect structure and metallurgical composition. Instrumentation systems have been developed for practical application of the Barkhausen method, and in a few cases, the method is in use for routine inspection, e.g., the inspection of helicopter rotor blades and bearing races for residual stress. A number of other specific NDE applications have been suggested such as measurement of grain size, evaluation of anisotropy, determination of carbide precipitation, measurement of pearlite morphology, determination of iron loss, analysis of ferrite content, inservice inspection of pipelines to determine overheating, creep strength and fatigue damage, and supervision of irradiation damage in nuclear reactor pressure vessels.