Inertial load model penetration

[spider80]

Hi,
I have an FEA model where all my parts are bonded contacts (no contact surfaces). I am trying to fix one end of this model and apply inertial load on the other.
However the heavy parts are penetrating into the soft ones. How do I avoid this model penetration?

Thanks,

 

[FredGarvin]

Admittedly, I am horrible when it comes to contact analysis. I just don't do enough of it to make it sink in. If you are using ANSYS, take a look here for a good beginner tutorial for contact analysis: http://www.mece.uAlberta.ca/tutorials/ansys/AT/Contact/Contact.html

This site is a great reference for ANSYS in general.

 

[minger]

I have problems with it too; if you find the answer, let me know. Typically if the parts are bonded, then i just unite them in UG, then import them as one single parasolid.

I figure the bonded contact can't be too (hoepfully) different than the element itself.

 

[Mech_Engineer]

Hi,
I have an FEA model where all my parts are bonded contacts (no contact surfaces). I am trying to fix one end of this model and apply inertial load on the other.
However the heavy parts are penetrating into the soft ones. How do I avoid this model penetration?

Thanks,

It sounds to me like the contact conditions aren't defined properly, or the penetrations aren't "real." Sometimes when you are displaying displacements using ANSYS Workbench, it will automatically scale the displacements being displayed so it's easy to see what's going on; however, this can make things look artificially deformed, especially when the diplacements are scaled up by a factor of 1000 or more.

I would like to see a screenshot of your geometry and where the penetrations is occurring, I suspect it can be solved by re-defining the contact conditions and taking a good look at your loading and boundary conditions.

 

[FredGarvin]

I do believe in ANSYS you can control the amount of penetration between nodes and or surfaces. I will check on that.