FE simulations

[innoaltran]

Hi,

   I tried to do FE simulation in inventor 2015 for a v bending process. I have problems with surface penetrations and large deformations. Does anybody have experience with this kind of simulations?

[admaiora]

hI innoaltraN, can you attach the files?

[innoaltran]

Hi admaiora,

      I have attached the file. Now I used the spring contact and increased the contact stiffness. Looks better. Still there is large deformation and penetration. It would be a great help, if you can improve it.

- Innoaltran

[innoaltran]

Also the sheet material is not moving on the die. This is probably due to given high contact stiffness. I cannot get a good result with low stiffness.

[admaiora · Accepted solution]

Hi Innoaltran,

don't worry about the "soft spring" message and contact, it is automatically added due the "rigid mode instability" behavior of the components.

(see to better understand

http://help.autodesk.com/view/INVNTOR/2015/ENU/?guid=GUID-F6FBFEFF-0372-48C4-81C8-2D2B1F8BEBD3  )

You get the "deformation large compared .."  message due the elevate Forze (6000 N , used on a 0.5 mm sheet metal), so you clearly pass the Yield Strength limit of the material.

Pay attention on results, because a deformation like this depends on the time of the force is acting, stress analysis in Inventor consider a static deformation.

I have added manual contact to simulate reality of this case.

You can read more about contact here:

http://help.autodesk.com/view/INVNTOR/2015/ENU/?guid=GUID-4CAFC652-873B-4709-B107-D39A399FCE8D

I have refined a little bit the meshing ( 0.05 size) and "Create Curved Mesh Elements" active

You can find the assembly attached here:

https://dl.dropboxusercontent.com/u/63644155/Assy-A1.zip

I hope that it can helps in your study,

good luck!

[innoaltran]

Thanks for the tutorials which I didn't that it exists. First I used separation contact and then changed to spring contact for the friction between surfaces. Is there a way to include friction?

[admaiora]

Hi Innoaltran,

no, no way. You can simulate that with Separation/no sliding if is an important friction, or with springs.

I hope that i can be  a solution for you.

regards

[guido_66]

The warning message is there for a reason. This simulation is not valid, Inventor calculates all deformations as being elastic. The plastic deformation that will occur in reality isn't taken into account.