Learning Forum

[ngocminh2532003]

Hello,
I am doing a MEMS model simulation on Ansys, I have done the stimulation but the result is far from the calculation, I don't know whether I did it correctly or not. Can somebody help me to check my simulation?
Thank you
Minh

[Ashish Khemka]

Hi,

Can you please share the details of the setup and what you are expecting here? It will become easier for the forum members to comment.

Regards,

Ashish Khemka

[ngocminh2532003]

 

Hi,
Sorry for my delay, I had to pause my project due to health problem.
In my simulation, I set up a force of 413uN and the deformation along the X axis is 9.8125um (my expectation is about 20um), the deviation increases when the setup force becomes larger. Below are some details of my simulation.
Regards, 
Minh

 

[Ashish Khemka]

Hi Minh,

I hope you are in good health now and thanks for posting the details. Lower value of deformation in x-direction than expected indicates either a larger resistance to motion in that direction or lower force application. It may be required to look into the model which Ansys employees cannot do.

By the way what is the contact defined over here?

 

If you can share details of contact then it may help to comment further.

 

Regards,

Ashish Khemka

 

 

[ngocminh2532003]

Hi Ashish Khemka,
Thanks for your reply. When the force applied pulls in, the two beams slide on the ratchet rack, the contact defined here is frictional contact. Below is the detailed setup of frictional contact.


Regards,
Minh

[Ashish Khemka]

Hi,

Can you try turning off the small sliding? For contact detection try using nodal projected normal from contact. Please see if these changes help.

 

Regards,

Ashish Khemka

[ngocminh2532003]

Hi,
I did what you suggested but it led to unconverged problem.

 

Regards,
Minh

[Ashish Khemka]

Hi,

What you can do in above scenario is to apply the displacement instead of force and mesaure the force reaction on the displacement boundary condition.

Regards,

Ashish Khemka

[ngocminh2532003]

Hi,
When I did that the result remained unchanged, the measured reaction force was greatly higher than expected. Do you have any other suggestions for my simulation?

Regards,
Minh

[Ashish Khemka]

Hi,

It would be difficult to comment without looking into the model. Please wait for other forum members to chime in.

Regards,

Ashish Khemka