Ultrasonic velocity and amplitude characterization of magnetorheological fluids under magnetic fields

Variations in velocity of sound and amplitude of the signal of a commercial magnetorheological fluid under different magnetic fields are studied experimentally. Different factors such as orientation, uniformity, geometry and intensity of the magnetic field are investigated. An increase in the change...

Full description

Saved in:
Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2012-01, Vol.324 (2), p.222-230
Main Authors: Rodríguez-López, J., Elvira Segura, L., Montero de Espinosa Freijo, F.
Format: Article
Language:English
Subjects:
Amplitudes
Anisotropic microstructure
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electro- and magnetorheological fluids
Electromagnets
Exact sciences and technology
Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc
Magnetic fields
Magnetic liquids
Magnetic properties and materials
Magnetorheological fluid
Magnetorheological fluids
Material form
Material types
Permanent magnets
Physics
Rheology
Sound velocity
Studies of specific magnetic materials
Ultrasonic attenuation
Ultrasonic velocity
Ultrasound
Variability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Variations in velocity of sound and amplitude of the signal of a commercial magnetorheological fluid under different magnetic fields are studied experimentally. Different factors such as orientation, uniformity, geometry and intensity of the magnetic field are investigated. An increase in the change of MR fluid acoustical properties is obtained when the magnetic field intensity is risen. In addition, these properties show an opposite behavior when a magnetic field is applied parallel or perpendicular to the ultrasound propagation. Experiments using an electromagnet and permanent magnets as the source of magnetic field are also compared. Properties such as anisotropy in sound velocity and amplitude make these materials interesting regarding applications. ► First sound attenuation measurements as function of the magnetic field in MR fluids. ► Sound velocity and attenuation anisotropy due to the microstructure is detected. ► Geometry, intensity and uniformity of the magnetic field affect sound propagation.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2011.08.019