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a) Joule Effect (Direct Magnetostrictive Effect), b) Villari Effect (Inverse Magnetostrictive Effect)
Source publication
Corrosion detection is an essential part of a strategy to protect critical assets exposed to the environment. This activity becomes especially challenging when a section of the object being inspected is buried, covered, or coated, as it frequently happens with lamp posts, underground road crossing pipes, tanks, and insulated tubes. The frequent pre...
Context in source publication
Context 1
... is a phenomenon involving a magnetization process and dimension/shape change in ferromagnetic materials [2][3]. A magnetostrictive material which is subject to a magnetic field, changes its length as shown in Figure 2a (Joule Effect). The change in length experienced is due to the rotation of the magnetic domains in the ferromagnetic material. ...
Citations
This paper covers the development and preliminary test for a technique to inspect tank floors from the outside of the tank using Electromagnetic Acoustic Transducers (EMAT). The goal is to reduce the high cost associated with inspections that require emptying the tank by providing an assessment of the tank floor next to the wall, which typically experiences the most corrosion and degradation. The paper explains the steps taken during the development of the technique, and the results on laboratory mock ups and field tests.
