Properties of nickel as a magnetostrictive material for ultrasonic conditions

McHugh, William (2011) Properties of nickel as a magnetostrictive material for ultrasonic conditions. [USQ Project]

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Abstract

Joule, in 1842, discovered the magnetostrictive effect, also referred as the Joule effect, where a material will change its physical length when subjected to an induced magnetic field. Magnetostrictive transducers convert magnetic energy into mechanical energy. That is, nickel can use an oscillating magnetic field to produce oscillating mechanical energy or sound energy. The magnetostrictive effect was used extensively in World War 2 for sonar transducers. More recent uses include dentistry, ultrasonic cleaning, plastic welding and improved metal refining.

This project involves the implementation of procedures by IEC 60782 and Petošić, Svilar and Ivančević to examine magnetostrictive transducers. Results were variable, mainly due to the function generators inability to supply the relative high currents. But with persistence some useable data was obtained.

Results include the confirmation of the resonant frequency of the transducer via mechanical vibration analysis and related to the physical design of the transducer.

The transducers respond as an almost pure inductor, resulting in a measured power factor in the vicinity of 0.09. Under ultrasonic conditions an electroacoustic efficient was calculated around 30 per cent.

Limited investigation were then performed on cavitation which provided some interesting results such as the electrocavitation effiency being around 3.82 per cent with a cavitation resonant frequency differing from the ultrasonic resonant frequency.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering
Supervisors: Bowtell, Leslie
Date Deposited: 20 Dec 2012 06:51
Last Modified: 03 Jul 2013 01:36
Uncontrolled Keywords: magnetostrictive transducers
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/22562

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