Motion induced remote field eddy current effect in a magnetostatic non-destructive testing tool: a finite element prediction

Application of perturbation methods in finite element analysis of stress corrosion cracking

“…Since the field level is significantly low in the remote field region, linearity of constitutive relations is assumed and the total current in the presence of SCC is the sum of the background current in the defect free pipe and the equivalent perturbation current introduced by the SCC. With in unknown in (3) where is the complement of , we have the total current:…”

“…A possible solution to this problem is to utilize the fields associated with the circumferential currents generated in the pipewall [3] by the movement of the magnetizer relative to the pipewall. Since the magnetizer velocity, , is along the pipe axis, the motional emf due to the term is negligible between the poles of the magnet.…”

GMR versus differential coils in velocity induced eddy current testing

“…One example of an industry that can benefit from better inspection systems is the railroad industry. One of the main causes of train derailment is rolling contact fatigue (RCF) occurring on the track [1], and a few methods of inspection already exist, such as ultrasonic testing techniques and magnetic flux leakage (MFL) [2][3][4]. However these solutions can hardly be applied to any commercial travelling train mainly due to the velocity limitations imposed by all the currently available solutions.…”

Application of state-of-the-art FEM techniques to magnetostatic NDE

“…The eddy currents generated by AC fields are responsible for the bi-directional transmission of the EM field. In the Ccise of a moving DC field, the RPEC effect has been observed [35] and is produced by the motionally induced eddy currents. Though currents induced at the poles and at the defect both produce an independent RFEC, the large currents produced at the poles dominate the effect described in this section.…”