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Analytical investigation of strain loading frequency effect on stress-strain-temperature relationship of shape-memory alloy

100%

Ikeda T.

tom Vol. 67, nr 4

275--291

In this paper a set of simple governing equations of shape-memory alloys was derived by introducing some assumptions and a formula giving temperature variation was obtained by integrating one of the governing equations. The factors affecting the temperature variation depending on loading frequency were analytically investigated from the formula. The obtained temperature variation agreed qualitatively with the measured data. The calculated stress-strain-temperature relationship also agreed qualitatively with the measured data. It was found from the formula that the temperature vibrates sinusoidally and approaches a certain value asymptotically, and that the temperature variation is affected by the ratio of frequency to heat transfer and the ratio of latent heat to generated heat.

Structure and magnetic behavior of mononuclear and dinuclear Cu(II)/Zn(II) monocarboxylate-pyridine derivatives by crystal engineering

51%

Ohmura T. , Mori W. , Takei T. , Ikeda T.

tom Vol. 23, No. 3

729--736

We prepared metal organic frameworks such as copper(II) monocarboxylate (formate and benzoate) pyridine derivatives and zinc(II) monocarboxylate (p-phenyl benzoate and benzoate) pyridine derivatives. These complexes were synthesized at room temperature using pyridine or p-phenyl pyridine to grow single crystals that were then analyzed using single-crystal X-ray analysis. These structures are formed by hydrogen bonding and the self-assembly of pi-stacking of mononuclear units. The magnetic susceptibilities of the copper(II) complexes obeyed the Curie-Weiss law over the range of 2-300 K . The Weiss constants indicated the existence of small antiferromagnetic interactions arising from the hydrogen bonding.

Magnetic properties of soft magnetic materials under tensile and compressive stress

45%

Kanada T. , Kido Y. , Kutsukake A. , Ikeda T. , Enokizono M.

tom R. 87, nr 9b

93-96

The measurement is carried under the tensile and compressive stresses on non-oriented electrical steel sheets and amorphous sheet, 100×500mm. They are measured by stress load type SST. The results of magnetic power loss and magnetization curve on NO steel sheet in case of no stress, tensile stress 15MPa and compressive stress 15MPa are shown. It is clear that the effect of tensile stress is not so remarkable, though compressive stress affects the magnetic properties greatly. Three types of amorphous sheet, as cast, annealed and annealed in magnetic field were measured.

Przeprowadzono badania wpływu naprężeń na właściwości b lach niezorientowanych SiFe oraz amorficznych. Wykorzystano urządzenie typu SST - próbka miała rozmiary 100 x 500 mm. Badano straty mocy i krzywą magnesowania.