INFLUENCE OF A U-SHAPED MAGNETIC CORE OF AN INDUCTOR WITH TWO COILS ON EDDY CURRENTS OF THIN-WALLED NON-MAGNETIC METAL PLATES IN PROCESS OF MAGNETO-PULSED TREATMENT

A review of the literature on the use of pulsed electric current to create electro-plastic effect in metal parts is performed. Inductor with a U-shaped magnetic core and pulsed current is investigated for processing thin-walled metal plates with rectilinear welds. With a saturated magnetic core relative magnetic permeability can be low, so using a magnetic core can be impractical. The aim of the work is to establish the influence of a magnetic core of an induction system on voltage, current and magnetic forces when reaching the eddy current density of 109 A/m2 in the weld of a non-magnetic thin-walled metal plate. A two-dimensional model of the induction system with and without the magnetic core is investigated here. Simulation of the distribution of electromagnetic fields with the reduction of the parameters of the two-dimensional model to three-dimensional is performed. A capacitor charged to a certain voltage is a source of pulsed currents in inductor winding. The equation of the electric circuit for determining the current in the inductor’s winding is solved. The influence of the dimensions of the magnetic core on voltage and currents in the inductor’s winding is determined. The influence of the magnetic core on the transients of voltages of capacitor and inductor, the currents in the winding and the weld of the metal non-magnetic plate, the magnetic forces in the weld is studied. The influence of the magnetic core on distribution of magnetic field strength, currents and magnetic forces on the surface of the plate in the area of the weld is studied. Ref. 13, Fig. 4, Table.

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Two dimensional model of eddy currents and saturation in thin film write heads

7th Joint MMM-Intermag Conference. Abstracts (Cat. No.98CH36275) ◽

10.1109/intmag.1998.742079 ◽

2005 ◽

Author(s):

A.F. Torabi ◽

M.L. Mallary

Keyword(s):

Thin Film ◽

Eddy Currents ◽

Two Dimensional ◽

Dimensional Model ◽

Write Heads ◽

Two Dimensional Model

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Two dimensional model of eddy currents and saturation in thin film write heads

IEEE Transactions on Magnetics ◽

10.1109/20.706584 ◽

1998 ◽

Vol 34 (4) ◽

pp. 1465-1467 ◽

Cited By ~ 4

Author(s):

A.F. Torabi ◽

M.L. Mallary ◽

R. Perry ◽

G. Kimball

Keyword(s):

Thin Film ◽

Eddy Currents ◽

Two Dimensional ◽

Dimensional Model ◽

Write Heads ◽

Two Dimensional Model

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Commitment to pro- versus counter-attitudinal behavior and the dynamics of social representations

Swiss Journal of Psychology ◽

10.1024//1421-0185.61.1.34 ◽

2002 ◽

Vol 61 (1) ◽

pp. 34-44 ◽

Cited By ~ 8

Author(s):

Eric Tafani ◽

Lionel Souchet

Keyword(s):

Higher Education ◽

Social Representations ◽

Cognitive Restructuring ◽

Social Representation ◽

Two Dimensional ◽

Dimensional Model ◽

Social Actions ◽

The Social ◽

Two Dimensional Model ◽

Students Attitudes

This research uses the counter-attitudinal essay paradigm ( Janis & King, 1954 ) to test the effects of social actions on social representations. Thus, students wrote either a pro- or a counter-attitudinal essay on Higher Education. Three forms of counter-attitudinal essays were manipulated countering respectively a) students’ attitudes towards higher education; b) peripheral beliefs or c) central beliefs associated with this representation object. After writing the essay, students expressed their attitudes towards higher education and evaluated different beliefs associated with it. The structural status of these beliefs was also assessed by a “calling into question” test ( Flament, 1994a ). Results show that behavior challenging either an attitude or peripheral beliefs induces a rationalization process, giving rise to minor modifications of the representational field. These modifications are only on the social evaluative dimension of the social representation. On the other hand, when the behavior challenges central beliefs, the same rationalization process induces a cognitive restructuring of the representational field, i.e., a structural change in the representation. These results and their implications for the experimental study of representational dynamics are discussed with regard to the two-dimensional model of social representations ( Moliner, 1994 ) and rationalization theory ( Beauvois & Joule, 1996 ).

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