Title :
Magnetostriction: revealing the unknown
Author :
Jones, Becky ; Liang, Chen
Author_Institution :
EXTREMA Products Inc., Ames, IA, USA
fDate :
3/1/1996 12:00:00 AM
Abstract :
Giant magnetostrictive materials began to be developed during the 1970s. One material in particular was developed by the Naval Ordnance Lab for use in sonar applications. TERFENOL-D, named for its primary constituents of terbium, iron and dysprosium and place of invention, generates usable strains of 1 mil per inch of material in an applied magnetic field, TERFENOL-D actuators provide 220 N to 880 N of force. Oil well logging shear wave generation using TERFENOL-D sources is accomplished with 1 A of current, providing 3,000 N of force. TERFENOL-D exhibits inverse magnetostriction, or the Villari effect, making it able to provide on demand nondestructive evaluation and inspection of structures, commonly referred to as magnetotagging
Keywords :
actuators; dysprosium alloys; inspection; iron alloys; magnetostriction; magnetostrictive devices; nondestructive testing; terbium alloys; TERFENOL-D; TbDyFe; Villari effect; actuators; giant magnetostrictive materials; inspection; inverse magnetostriction; magnetotagging; nondestructive evaluation; oil well logging; shear wave generation; Actuators; Iron; Magnetic domains; Magnetic field induced strain; Magnetic materials; Magnetic moments; Magnetostriction; Petroleum; Stress; Well logging;
Journal_Title :
Aerospace and Electronic Systems Magazine, IEEE
