magnétostriction

Domaine: physiquemagnétisme
Date: 1990

Définition :

Phénomène de déformation élastique d'un barreau de fer, de nickel, de cobalt ou d'alliage ferromagnétique, sous l'effet d'un champ magnétique.

Note :

Employée pour les ultrasons.

Terme :

magnétostriction n. f.

Traductions

anglais
Date : 1990
Définition

The phenomenon of change of dimensions with magnetisation.

Change in physical dimensions due to a magnetic field.

Note :

When a ferromagnetic substance is magnetised, there occurs, in general, a change in volume as well as of shape; the material may swell, stretch or bend, and twist; on the other hand, mechanical deformations produce profound changes in magnetic properties, especially as regards to magnetisation; if a material changes by relatively large amount when magnetised to saturation, it is said to be strain sensitive, strain sensitivity and magnetostriction being reciprocal properties; the highest initial permeabilities are found in materials having very small magnetostriction; in iron-nickel alloys the saturation magnetostriction varies with the percentage of nickel, and is zero when nickel = 81%; the strain-sensitivity of permalloys is zero when nickel = 81%.

Terme :
1. magnetostriction