Permanent magnet simulation in abaqus

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Permanent magnet simulation in abaqus

Abaqus Users mailing list
Hi All

 How can I simulate a permanent magnet in Abaqus ?
 

 I could not figure it out using this : http://abaqus.software.polimi.it/v6.14/books/usb/default.htm?startat=pt03ch06s07at25.html http://abaqus.software.polimi.it/v6.14/books/usb/default.htm?startat=pt03ch06s07at25.html
 

 is there an example ?
 How should I compute K ?
 

  On the other hand, in applications such as one where a magnetic material is embedded in a uniform far-field magnetic field, it may be necessary to specify nonzero values of the magnetic vector potential on some portions of the external boundary. In this case an alternative method to model the same physical phenomena is to specify the corresponding unique value of surface current density, , on the far-field boundary (see “Loads http://abaqus.software.polimi.it/v6.14/books/usb/pt03ch06s07at25.html#usb-anl-amagnetostatic-loads” below).  can be computed based on known values of the far-field magnetic field.

 
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Re: Permanent magnet simulation in abaqus

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You can simulate a permanent magnet by defining the appropriate material properties.
 For a permanent magnet, you will need to specify *Magnetic Permeability (available in CAE, and can be linear or nonlinear) and *Permanent Magnetization (must be added using keyword editor).
 

 You will need the normal curve to model a permanent magnet. This is a B-H curve which is usually given in the second quadrant (using negative values of H and positive values of B). The coercivity is taken as the magnitude of the value where the curve crosses the H axis. In Abaqus, you will need to shift the B-H curve by the coercivity value, so that the curve starts at (0,0).
 

 The *Magnetic Permeability is defined using the B-H curve (or the gradient of the curve for linear behaviour) and *Permanent Magnetization must specify the direction of the magnet and the coercivity value.
 

 Phil Williams
 Simutech.com.tw
 


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