Topological hysteresis as a model for Rayleigh damping

✍ Scribed by D.N. Beshers; G.B. Vunni

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 116 KB
• Volume: 442
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.02.222

✦ Synopsis

To account for the large magnetomechanical damping of demagnetized specimens, we propose as a model Landau's arrangement of magnetic domains with no overall magnetic moment. To analyze the model, we use the nature of magnetostriction to transform the data from internal friction, Q -1 , and strain amplitude, ε, into energy loss and volume fraction reoriented by stress, both as functions of ε. The large peak in Q -1 (ε) above the upper end of the Rayleigh range is attributed to the onset of gross changes in the domain structure, the Rayleigh range to dynamics of closure domains on a finer scale, and the lower end of the range to the wall displacements becoming of the order of one atomic distance.