Advanced soft- and hard-magnetic material models for the numerical simulation of electrical machines.

Numerical simulation of small-scale explosion in dry sand using two sand material models including the Sand model and the LA model were carried out in the present study. Three cases were considered which the depths of burial (DOB) of the explosive C4 charge were 0, 30 mm and 80 mm, respectively. The time arrival of the blast-wave front and the maximum overpressure of fixed measuring locations were studied using a two dimensional axisymmetric model in hydrocode ANSYS/AUTODYN. Furthermore, the crater diameters and the heights of detonation product cloud respect to the time were also studied by comparing with the test data. The simulation results indicate that the both sand material models were hardly predict the test data exactly which proves that the sand properties and the material model should be more carefully studied and defined.

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Differentiation Algorithms For Soft Magnetic Material Models

[1993] Digests of International Magnetics Conference ◽

10.1109/intmag.1993.642492 ◽

1993 ◽

Author(s):

P.P. Silvester ◽

D. Omeragic

Keyword(s):

Magnetic Material ◽

Soft Magnetic Material ◽

Soft Magnetic ◽

Material Models

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An overstoichiometric Nd-Fe-B hard magnetic material

Journal of the Serbian Chemical Society ◽

10.2298/jsc100217058z ◽

2010 ◽

Vol 75 (9) ◽

pp. 1271-1277 ◽

Cited By ~ 1

Author(s):

Tomás Zák ◽

Nadezda Talijan ◽

Vladan Cosovic ◽

Jasna Stajic-Trosic ◽

Aleksandar Grujic

Keyword(s):

Magnetic Material ◽

Thermal Treatment ◽

Magnetic Measurements ◽

X Ray Diffraction ◽

Hard Magnetic Material ◽

State Measurement ◽

Before And After ◽

Rich Alloy ◽

Thermomagnetic Curve ◽

Quality Material

A commercial Nd-rich Nd-Fe-B-based hard magnetic material was studied. The obtained results were compared before and after recording of the thermomagnetic curve up to 800?C. The curve itself showed clearly besides Curie points of the Nd2Fe14B phase and ?-Fe also another critical temperature. M?ssbauer spectroscopic (MS) phase analysis and X-Ray diffraction analysis (XRD) showed in addition to the commonly known phases Nd2Fe14B and NdFe4B4 also some paramagnetic and ferromagnetic iron atoms (MS) and Fe17Nd2 intermetallics (XRD). During the exerted thermal treatment, the content of the Nd2Fe14B and NdFe4B4 phases remained almost unchanged, while iron atoms from remnant minor phases built a separate ?-Fe phase. The XRD pattern also showed the presence of some minor Nd phase. The results of SQUID magnetic measurements suggest a nanocrystalline decoupled structure of the Nd-rich alloy in the optimized magnetic state. Measurement of the magnetization loop showed, in spite of small changes in the phase composition, that magnetic properties of the quality material deteriorated during the thermal treatment.

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