15~chapter 15

15~chapter 15 - Materials engineering science processing...

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Unformatted text preview: Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Magnetization Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Ferrites and ferro-magnetic materials become magnetized when placed in a magnetic field Soft magnets lose their magnetization when the field is removed – hard magnets retain their magnetization Magnetic Fields in a Vacuum Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Figure 15.1 Figure 15.2 A current running through a long empty coil generates a magnetic field Magnetic fields exert forces on a wire carrying an electric c current Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Figure 15.3 Flux Density μ o – permeability of a vacuum A magnetic materials exposed to a field H becomes magnetized, concentrating the flux lines Magnetic Fields in Materials Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Figure 15.4 Induction μ R – relative permeability Magnetization – magnetic susceptibility Magnetization decreases with temperature, falling to zero at the Curie temperature T c Measuring Magnetic Properties: M-H Curve Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Figure 15.5 Saturation magnetization Maximum magnetization achieved from an applied magnetic field Remanent magnetization Magnetization left when magnetic field is removed...
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This note was uploaded on 02/15/2012 for the course MASC 310 taught by Professor Nutt during the Fall '08 term at USC.

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15~chapter 15 - Materials engineering science processing...

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