By Topic

Stress-induced magnetization changes of steel pipes--Laboratory tests, Part II

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
D. Atherton ; Queen's University at Kingston, Kingston, Ontario, Canada. ; C. Welbourn ; D. Jiles ; L. Reynolds
more authors

Magnetometer surveys above gas pipelines have shown stress-induced magnetic anomalies at pipe bends. This suggests a technique for noninvasive monitoring of stress in pipelines and other ferromagnetic structures. Previous laboratory measurements of the external magnetic field changes due to single bending and internal pressure cycles on 110 mm diameter steel pipes demonstrated that stress and magnetic hysteresis effects were important. The stress-induced changes in magnetization produced during multiple cycles of elastic bending and internal pressure for pipes which have been demagnetized and then magnetized to simulate magnetic inspection of a real pipeline is reported. The stress-induced changes can be divided into relatively large irreversible changes occurring principally during initial stressing and smaller reversible changes occurring during any stress cycle. This is in agreement with Jiles' and Atherton's recent theory of the effect of stress on magnetization which shows that the application of stress to a ferromagnet shifts its magnetization towards the anhysteretic which is also slightly stress dependent. The significance of results to applications is indicated.

Published in:

IEEE Transactions on Magnetics  (Volume:20 ,  Issue: 6 )