Which constraint should I use on my FEA?

There're several method to do a static analysis for this. One of them is:

• Outer face of external ring => Fixed translations belong X, Y and Z-axis
• Make a Hinge elements for Gears A & B so they can rotate about their axis.
• Contact condition between external ring & Gear B
• Contact condition between gear A & gear B
• Loading (torque) will be applied on Gear A (via RBE2 for example)

Hello @Q.Nguyen-Dai,

Thank you for your reply. I assigned a three RBE2. One in the middle of 'GEAR A' and one in the middle of 'GEAR B' and assigned a constraint in x, y and z (displacement) for each one, and I've assigned one RBE2 on face of 'GEAR A' for the input torque. Then I've the following error:

 There were 2 error messages during input processing.
  The first message is repeated below:

  *** ERROR # 339 ***
  The dependent d.o.f. is constrained by grid or spc data.
  RBE3 element id = 178357.
          grid id = 33819.
        component = 1.

Do you know how can I solve this?

Thanks!

You speak about RBE2, but in the error message I see RBE3 ? /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

@Q.Nguyen-Dai, you are right, I've used RBE3 instead of RBE2. Could be this the problem?

@Henry26

RBE3 dependent nodes can't be constrained. Please use RBE2 instead, 

Thank you guys, it worked.