Matrial: Isotropic spline saturation

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

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"?>error2.thumb.png.5c13aa1cf9fd3bbd7cefb5dab78d20a3.png

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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Answers

  • asoualmi
    asoualmi
    Altair Employee
    edited June 2018

    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
    Altair Forum User
    Altair Employee
    edited June 2018

    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
    Altair Forum User
    Altair Employee
    edited July 2018

    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).

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