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Matrial: Isotropic spline saturation

Altair Forum User

Hello,

I wanted to make a B-H curve by a spline through given points. After the physical check the following warning appears:

<?xml version="1.0" encoding="UTF-8"?>

What does it mean? I tried to make an increase between the last two points of Mu0% but the warning appears again.

Thank you.

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asoualmi

Hello,

In principle when you draw the curve of permeability, at the end the final value is around 1. In your case the value is different from 1 for this reason Flux displays this warning.

Best regards.

Altair Forum User

Hi,

Thank you. But which value has to be 1? The magnetic flux density? Because I think that doesn't make sense if B has to be 1. That would be mean, that you can never reach a magnetic flux density higher than 1.

In the table of the material I have to specify B [T] and H [A/m]. My last value of B is 2.15 T and not 2.5915... like in the warning message.

What does Flux mean with 'The final permeability is ...'. because the final permeability is B(end)/H(end)=0.000036376105. Is this really the final permeability? Or how can I get it?

Thanking you in advance.

Altair Forum User

I found it out.

The slope of the last two Points has to be Mu0:

[ H(end) - H(end-1) ] / [ B(end) - B(end-1) ] = Mu0

So I set H(end) and calculated with the formula the appendent B(end).