Thermal effect of heat input on an iron rod - magnetostriction

AI Thread Summary
An iron rod placed within two coils experiences length changes due to magnetostrictive properties when current flows in the same direction. Initially, the rod increases in length, but eventually, it begins to reduce in length. When currents oppose each other, the focus shifts to thermal properties, where heat input causes the rod to lengthen without magnetostrictive influence. The discussion raises questions about whether the rod will reach a maximum length and stop as heat input increases. The Villari Reversal Effect is mentioned as a related concept in understanding these phenomena.
ZedCar
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If an iron rod, inside two coils, incurs current going through the coils in the same direction, then the rod will increase in length and then it will begin to reduce in length.

This is due to the magnetostrictive properties of the iron.

When the currents oppose each other, so as to cancel, then the thermal properties only can be studied. That is, without the influence of magnetostriction.

The iron rod would increase in length due to the heat input.

But will it get to a certain length, then stop? That is, as the heat input continues to rise.

As the heat input continues to rise, I presume it won't reduce in length?

Thank you.
 
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ZedCar said:
If an iron rod, inside two coils, incurs current going through the coils in the same direction, then the rod will increase in length and then it will begin to reduce in length.

I had to look it up as this isn't my subject but are you talking about the Villari Reversal Effect?
 
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