Three-dimensional finite-element modelling in eddy-current nondestructive testing

Eddy-current nondestructive testing is increasingly used in industry as a means of noninvasive detection of flaws in metals that are electrically conducting. Various computer modelling techniques have been used in the past for simulating different NDT processes. This contribution is concerned with the prediction of electromagnetic fields in the vicinity of a surface flaw using a general three-dimensional finite-element eddy-current program. Fields are modelled in terms of either the magnetic vector potential A or a magnetic scalar potential. Some experimental and calculated results are presented that suggest that the program could be used in its present form for a certain range of NDT problems. Some areas where further improvement would be desirable are highlighted