Summary
A contribution to the investigation of the stress effect on the saturation magnetostriction of polyerystalline rods stressed by torsion is presented. The critical torsional stress above which magnetostriction remains constant is found and the crystal anisotropy level, at various torsions, is estimated. As in the tensional case, the effect of crystal anisotropy at the critical stress has not been clearly interpreted so far. A study of the behaviour of the magnetization curve near saturation provides a possible explanation.
Riassunto
Si è riesaminata la magnetostrizione a saturazione di cilindri policristallini sottoposti a torsione. Lo sforzo critico oltre cui la magnetostrizione rimane costante è individuato con un metodo semisperimentale, che permette anche una stima dell'anisotropia cristallina. L'effetto di quest'ultima, a valori critici dello sforzo torsionale, non appare sinora ben spiegato, persino nel caso di semplice tensione. Si presenta una possibile interpretazione fondata sullo studio dell'andamento della magnetizzazione in approccio alla saturazione.
Резюме
Исследуется влияние напряжений на насыщение магнитострикции поликристаллических стержней, подвергнутых кручению. Определяется критическое крутящее напряжение, вьше которого магнитострикция остается постоянной и оценивается уровень кристаллической анизотропии при различных кручениях. Как и в случае растяжения, до сих пор влияние кристаллической анизотропии на критическое напряжение не получило надлежащей интерпретации. Предлагается возможное объяснение поведения кривой намагничивания вблизи насьщения.
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Lanotte, L., Luponio, C. & Tagliaferri, V. Magnetostriction in Ni rods under torsion: Critical stress and crystal anisotropy effect. Il Nuovo Cimento D 1, 215–224 (1982). https://doi.org/10.1007/BF02450080
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DOI: https://doi.org/10.1007/BF02450080