Discussion Forum

I have no experience with the kind of material you mentioned, but I guess it is possible to implement it in COMSOL through properly editing the equation system, i.e., modifying definitions of predefined variable and equations.

Good luck!
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Pu, ZHANG
DTU Fotonik

Thanks for your reply. Let's hope someone could share their expetise ; )

Hi,

You can find an example in our Application Gallery:

www.comsol.com/model/nonlinear-magnetostrictive-transducer-6063

Regards,
Henrik

Dear Dr. Sönnerlind,

Thank you very much for your reply. It was a nice example. Still, I have another few questions for the magnetostrictive implementation.

Let's say the magnetostrictive model is linear and can be governed by the following constitutive equations:

{S} = [c(H,T)] {T} + [d(H,T)]^t {H} ---------- (1)
{B} = [d(H,T)] {T} + [mu(H,T)] {H} ---------- (2)

where {S} is the mechanical strain, {B} magnetic flux density, {T} mechanical stress, {H} magnetic field density. [c] is compliance matrix, [d] magneto-mechanical coupling matrix, [mu] permeabilities. [*]^t denotes a transpose.

In the example you have introduced, we can implement Eq.(1). If I have well understood, it works as follows:
1) define new variables 'Lambda' in the Definitions section
2) in the Solid Mechanics -> under Linear Elastic Materials, create a initial stress and strain node and put Lambda into the initial strain tables.
Though, the example is for an axisymmetric case, I suppose for an ordinary 3D case, it works the same way.

Then, how about implementing the Eq.(2) ? Will there be some special details to pay attention to when the strong coupling is added? e.g. some settings in the solver or something like that so as to accelerate the calculations.

I would be very grateful if you could provide me with more instructions.

Regards,

A.R.

Below attached is an article talking more about the model that I am interested in.

Hi Amine,

I am postdoc researcher from the Ohio State University. Our group led by Prof. Dapino has been working on model magnetostrictive materials using COMSOL for more than 8 years. There are multiple methods to model magnetostrictive materials in COMSOL:

1) If you would like to model the fully-coupled, 3D, hysteretic behavior, please refer to
jim.sagepub.com/content/early/2014/02/20/1045389X14521703.abstract
iopscience.iop.org/article/10.1088/0964-1726/20/10/105034/meta

However, these models require COMSOL 3.5a and are not efficient enough for parameter optimization.

2) If your magnetostriction and magnetization are along the same direction, please refer to
iopscience.iop.org/article/10.1088/0964-1726/24/12/125019/pdf

This model is very accurate and efficient. I recently developed another model that incorporates mechanical, magnetic, and electrical dynamics. You could attach electrical circuit to the magnetostrictive system in COMSOL. That paper is in print now, I could send you a link whenever it becomes available.

Dan

Hello Folks,
Starting with version 5.2a, magnetostrictive materials are available right out of the box if your license includes the AC/DC Module along with either the Structural Mechanics Module, MEMS Module, or Acoustics Module.
For a starting point on this topic, please read the release highlights:
www.comsol.com/release/5.2a/structural-mechanics-module
Best regards,
Jeff

Hi Amine,

I am postdoc researcher from the Ohio State University. Our group led by Prof. Dapino has been working on model magnetostrictive materials using COMSOL for more than 8 years. There are multiple methods to model magnetostrictive materials in COMSOL:

1) If you would like to model the fully-coupled, 3D, hysteretic behavior, please refer to
jim.sagepub.com/content/early/2014/02/20/1045389X14521703.abstract
iopscience.iop.org/article/10.1088/0964-1726/20/10/105034/meta

However, these models require COMSOL 3.5a and are not efficient enough for parameter optimization.

2) If your magnetostriction and magnetization are along the same direction, please refer to
iopscience.iop.org/article/10.1088/0964-1726/24/12/125019/pdf

This model is very accurate and efficient. I recently developed another model that incorporates mechanical, magnetic, and electrical dynamics. You could attach electrical circuit to the magnetostrictive system in COMSOL. That paper is in print now, I could send you a link whenever it becomes available.

Dan

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thank you

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