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Electrical Engineering Materials
What is an Atom?
Atomic Energy Levels
Classification of Engineering Materials
Classification of Electrical Engineering Materials
Electron Configuration of Atom
Physical Properties of Materials
Mechanical Properties of Engineering Materials
Rutherford Atomic Model
Bohrs Atomic Model
Chemical Properties of Materials
Energy Bands in Crystals
Electrical Properties of Engineering Materials
Fermi Dirac Distribution Function
Magnetic Properties of Engineering Materials
Selection of Material for Engineering Application
Bases of existence of properties in materials
Low Resistivity or High Conductivity of Conducting Material
High Resistivity or Low Conductivity Conducting Material
Factors Effecting the Resistivity of Electrical Materials
Materials used for Heating Elements
Materials used for Precious Works
Materials Used for Transmission Line Conductor
Electrical Stranded Conductors
Materials used for Rheostats
Materials for Lamp Filaments
Classification of Electrical Conducting Material
Applications of Carbon Materials in Electrical Engineering
Selection of Materials Used for Electrical Contacts
Mechanism of Polarization
Dielectric Material as an Electric Field Medium
Electric Arc Furnace
Thermal Conductivity of Metals
Free Electron Theory of Metals
Thomson Plum Pudding Model (1911)
Then the ratio of δL to L is Joule’s magnetostriction coefficient (λ). λ = δL / L. There is a loss in energy due to friction in magnetic material cores. This effect is the reason of humming sound that we hear in transformer.Next, we can go through some of the effects used in magnetostriction. They are
- Joules Effect: When a ferromagnetic substance is subjected to magnetic field, it will alter in shape.
- Villari Effect: When a substance is subjected to a mechanical stress, the susceptibility of that substance changes (magneto elastic effect i.e. inverse of magnetostriction)
- Matteucci Effect: When a magnetostrictive material is subjected to a torque, a helical anisotropy of the susceptibility of that material will be created.
- Wiedemann Effect: When a helical magnetic field is applied to a material, it results in twisting of that material (reverse of Matteucci effect). It is shown in figure below.
The structure of the ferromagnetic substances is alienated into domains. Each domain is a region of identical magnetic polarization. When a peripheral magnetic field is applied, the borders linking the domains move and domains revolve. As a result, there will be change in the dimension of the material. This effect is the outcome of magneto crystalline anisotropy. Thus, a strain is induced in the material. This is because dissimilar crystal directions are related with dissimilar length. Matteucci effect and Wiedemann effect are linked with magnetostriction. They are explained above. Villari effect is contrary of magnetostriction effect.
Magnetostriction MaterialsThis effect is mostly seen in the magnetic materials such as iron, nickel, cobalt, iron-aluminium alloy and some other alloys like Terfenol-D, Galfenol, Metgla etc. They are mainly used in actuators and some motors.
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