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Questions and Answers
What is magnetostriction?
What is magnetostriction?
- A property of magnetic materials that causes them to change shape during magnetization. (correct)
- A property of non-magnetic materials that causes them to change shape during magnetization.
- A property of magnetic materials that causes them to change color during magnetization.
- A property of magnetic materials that causes them to emit light during magnetization.
What is the Villari effect?
What is the Villari effect?
- The change of the magnetic susceptibility of a material when subjected to mechanical stress. (correct)
- The change of the electric conductivity of a material when subjected to mechanical stress.
- The change of the thermal conductivity of a material when subjected to mechanical stress.
- The change of the magnetic field of a material when subjected to mechanical stress.
Which material exhibits the largest room-temperature magnetostriction of a pure element?
Which material exhibits the largest room-temperature magnetostriction of a pure element?
- Cobalt (correct)
- Iron
- Nickel
- Copper
What is Terfenol-D commonly used for?
What is Terfenol-D commonly used for?
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What is the ΔE-effect of Metglas 2605SC?
What is the ΔE-effect of Metglas 2605SC?
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What is the main use of cobalt ferrite?
What is the main use of cobalt ferrite?
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What is the effect of magnetostriction on ferromagnetic cores?
What is the effect of magnetostriction on ferromagnetic cores?
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What can magnetostrictive materials be used to build?
What can magnetostrictive materials be used to build?
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What is the saturation value of magnetostrictive strain?
What is the saturation value of magnetostrictive strain?
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What happens to the domains of ferromagnetic materials when a magnetic field is applied?
What happens to the domains of ferromagnetic materials when a magnetic field is applied?
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Study Notes
- Magnetostriction is a property of magnetic materials that causes them to change shape during magnetization.
- Ferromagnetic materials have a structure divided into domains, and when a magnetic field is applied, the boundaries between the domains shift and the domains rotate, causing a change in the material's dimensions.
- The magnetostrictive strain varies until it reaches its saturation value, λ.
- Magnetostriction causes energy loss due to frictional heating in susceptible ferromagnetic cores.
- The Villari effect is the change of the magnetic susceptibility of a material when subjected to mechanical stress.
- Magnetostrictive materials can convert magnetic energy into kinetic energy, or the reverse, and are used to build actuators and sensors.
- Cobalt exhibits the largest room-temperature magnetostriction of a pure element at 60 microstrains.
- Terfenol-D is the most commonly used engineering magnetostrictive material.
- Cobalt ferrite, CoFe2O4, is mainly used for its magnetostrictive applications.
- Metglas 2605SC exhibits a very strong ΔE-effect with reductions in the effective Young's modulus up to about 80% in bulk.
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