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1

Effect of temperature on crack kinking and jumping in a cross-ply laminated beam

Yamamoto S., Ikeda T., Senba A.

Archives of Mechanics

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2016

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Vol. 68, nr 5

349--369

EN

To understand the mechanisms of crack kinking and jumping that occur within the 90◦ layer of a cross-ply fiber reinforced plastic laminated plate, double cantilever beam tests were performed at several temperatures for laminated plates with two types of stacking sequences. The crack kink angles were calculated using a bi-layer shear-deformable beam model. Furthermore, the interlaminar shear stresses were calculated using finite-element models to clarify the mechanism of the repeated jumps. The following results were obtained from these experiment and analysis; (i) a crack at the center tended to propagate in a self-similar manner more stably at higher temperatures, (ii) the applied load at which value the crack at the center started propagation decreased as the 90◦ layer became thicker, and (iii) the crack along a 0◦/90◦ interface jumped to the other interface because the shear force along the 0◦/90◦ interface due to the thermal stress decreased as the crack propagated along the interface.

2

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

Ikeda T.

Archives of Mechanics

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2015

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Vol. 67, nr 4

275--291

EN

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.

3

Effect of perfluorinated surfactant as additive of background electrolyte for capillary electrophoresis of inorganic cations

Mori M., Ikeda T., Itabashi H.

Acta Chromatographica

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2012

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Vol. 24, no. 4

529--542

EN

This study reports the effect of a nonionic perfluorinated surfactant, N-polyoxyethylene-N-propyl perfluorooctane sulfonamide (PFOSA), as additive of background electrolyte on capillary electrophoresis (CE) of common inorganic cations. The association constants (Kass) for PFOSA estimated from the electrophoretic mobility of analyte cations were the order of Mg2+ > Ca2+ > Sr2+ > K+ ≈ NH4+ > Na+ ≈ Li+. The Kass values were larger than those for zwitterionic and nonionic surfactants with hydrocarbon moiety. Use of PFOSA made another essential contribution to the determination of inorganic cations in a protein-containing sample. This was considered because high solubility of PFOSA for proteins functioned as suppressor for protein adsorption to the capillary wall. Four inorganic cations, Na+, K+, Mg2+, and Ca2+, in human saliva sample were successfully determined by sample injection without any pretreatments except for filtration and dilution.

4

Magnetic properties of soft magnetic materials under tensile and compressive stress

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

Przegląd Elektrotechniczny

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2011

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R. 87, nr 9b

93-96

EN

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.

PL

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.

5

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

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

Materials Science Poland

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2005

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Vol. 23, No. 3

729--736

EN

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.