THE EFFECT OF STRESS ON THE MAGNETOSTRICTION OF IRON, NICKEL AND 49 PERMALLOY.
NOTRE DAME UNIV IND COLL OF ENGINEERING
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The effect of applied stresses on the technical magnetostriction curve, saturation magnetostriction and reversible magnetostriction at various levels of magnetization is examined experimentally and interpreted in terms of stress-induced changes in magnetization distribution. The different influences of employing hard and soft mechanical testing equipment in the application of stress in such experiments is considered. Experiments show that, while the effect of stress is to decrease the magnetomechanical coupling coefficients, K squared, for small field variations, superimposed stress may increase K squared by 50 percent when the field amplitude is made sufficiently large e.g., for nickel, 250 oe. This result is important also from the point of view that the wrong stress distribution, applied or residual, intentional or accidental, can degrade transducer efficieny by a corresponding amount. Author
- Electrical and Electronic Equipment
- Electricity and Magnetism
- Solid State Physics